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187 Cards in this Set

  • Front
  • Back
Gluteus maximus
Origin
ilium posterior to posterior gluteal line; dorsal surface of sacrum and coccyx; sacrotuberous ligament
Gluteus maximus
Insertion
fibers end in IT tract, which inserts into lateral condyle of tibia; some fibers insert on gluteal tuberosity
Gluteus maximus
Action
extends thigh (especially from flexed position) and assists in its lateral rotation; steadies thigh and assists in rising from sitting position
Gluteus maximus
Innervation
inferior gluteal nerve
Gluteus medius
Origin
External surface of ilium between anterior and posterior gluteal line
Gluteus medius
Insertion
lateral surface of greater trochanter of femur
Gluteus medius
Action
adduct and medially rotate thigh; keep pelvis level when ipsilateral limb is weight bearing and advance opposite (unsupported) side during its swing phase
Gluteus medius
Innervation
superior gluteal nerve
Gluteus minimus
Origin
external surface of ilium between anterior and inferior gluteal lines
Gluteus minimus
Insertion
anterior surface of greater trochanter of femur
Gluteus minimus
Action
adduct and medially rotate thigh; keep pelvis level when ipsilateral limb is weight
bearing and advance opposite (unsupported) side during its swing phase
Gluteus minimus
Innervation
superior gluteal nerve
Deep gluteal
Piriformis
Origin
anterior surface of sacrum; sacrotuberous ligament
Deep gluteal
Piriformis
Insertion
superior border of greater trochanter of femur
Deep gluteal
Piriformis
Action
laterally rotate extended thigh and abduct flexed thigh; steady femoral head in acetabulum
Deep Gluteal
Piriformis
Innervation
branches of anterior rami of S1, S2
Deep Gluteal
Obturator internus
Origin
pelvic surface of obturator membrane and surrounding bones
Deep Gluteal
Obturator internus
Insertion
medial surface of greater trochanter (trochanteric fossa) of femur
Deep Gluteal
Obturator internus
Innervation
nerve to obturator internus (L5, S1)
Deep Gluteal
Obturator internus
Action
laterally rotate extended thigh and abduct flexed thigh; steady femoral head in
acetabulum
Deep Gluteal
Superior gemellus
Origin
ischial spine
Deep Gluteal
Superior gemellus
Insertion
medial surface of greater trochanter (trochanteric fossa) of femur
Deep Gluteal
Superior gemellus
Action
laterally rotate extended thigh and abduct flexed thigh; steady femoral head in
acetabulum
Deep Gluteal
Superior gemellus
Innervation
nerve to obturator internus (L5, S1)
Deep Gluteal
Inferior gemellus
Origin
O: ischial tuberosity
Deep Gluteal
Inferior gemellus
Insertion
I: medial surface of greater trochanter (trochanteric fossa) of femur
Deep Gluteal
Inferior gemellus
Action
A: laterally rotate extended thigh and abduct flexed thigh; steady femoral head in
acetabulum
Deep Gluteal
Inferior gemellus
Innervation
N: nerve to quadratus femoris (L5, S1)
Deep Gluteal
Quadratus femoris
Origin
O: lateral border of ischial tuberosity
Deep Gluteal
Quadratus femoris
Insertion
I: quadrate tubercle on intertrochanteric crest of femur and area inferior to it
Superficial muscle group of posterior compartment of leg

Gastrocnemius
Innervation
N: tibial nerve (S1, S2)
Superficial muscle group of posterior compartment of leg

Gastrocnemius
Action
plantarflexes ankle when knee is extended; raises heel during walking; flexes leg at knee joint
Superficial muscle group of posterior compartment of leg

Soleus
Origin
posterior aspect of head of fibula; superior quarter of posterior surface of fibular soleal line, medial border and of tibia
Superficial muscle group of posterior compartment of leg

Soleus
Insertion
I: posterior surface of calcaneus via calcaneal tendon
Superficial muscle group of posterior compartment of leg

Soleus
Action
A: plantarflexes ankle independent of position of knee; steadies leg on foot
Superficial muscle group of posterior compartment of leg

Soleus
Innervation
N: tibial nerve
Superficial muscle group of posterior compartment of leg

Plantaris
Origin
O: inferior end of lateral supracondylar line of femur; oblique popiteal ligament
Superficial muscle group of posterior compartment of leg

Plantaris
Insertion
I: posterior surface of calcaneus via calcaneal tendon
Superficial muscle group of posterior compartment of leg

Plantaris
Action
A: weakly assists gastrocnemius in plantarflexing ankle
Superficial muscle group of posterior compartment of leg

Plantaris
Innervation
N: tibial nerve
Deep muscle group of posterior compartment of leg

Popliteus
Origin
O: lateral surface of lateral condyle of femur and lateral meniscus
Deep muscle group of posterior compartment of leg

Popliteus
Insertion
I: posterior surface of tibia, superior to soleal line
Deep muscle group of posterior compartment of leg

Popliteus
Action
A: weakly flexes knee and unlocks it by rotation femur 5° on fixed tibia; medially rotates tibia of unplanted limb
Deep muscle group of posterior compartment of leg

Popliteus
Innervation
N: tibial nerve
Deep muscle group of posterior compartment of leg

Flexor hallucis longus
Orgin
O: inferior 2/3 of posterior surface of fibula; inferior part of interosseous membrane
Superficial muscle group of posterior compartment of leg

Gastrocnemius
Innervation
N: tibial nerve (S1, S2)
Superficial muscle group of posterior compartment of leg

Gastrocnemius
Action
plantarflexes ankle when knee is extended; raises heel during walking; flexes leg at knee joint
Superficial muscle group of posterior compartment of leg

Soleus
Origin
posterior aspect of head of fibula; superior quarter of posterior surface of fibular soleal line, medial border and of tibia
Superficial muscle group of posterior compartment of leg

Soleus
Insertion
I: posterior surface of calcaneus via calcaneal tendon
Superficial muscle group of posterior compartment of leg

Soleus
Action
A: plantarflexes ankle independent of position of knee; steadies leg on foot
Superficial muscle group of posterior compartment of leg

Soleus
Innervation
N: tibial nerve
Superficial muscle group of posterior compartment of leg

Plantaris
Origin
O: inferior end of lateral supracondylar line of femur; oblique popiteal ligament
Superficial muscle group of posterior compartment of leg

Plantaris
Insertion
I: posterior surface of calcaneus via calcaneal tendon
Superficial muscle group of posterior compartment of leg

Plantaris
Action
A: weakly assists gastrocnemius in plantarflexing ankle
Superficial muscle group of posterior compartment of leg

Plantaris
Innervation
N: tibial nerve
Deep muscle group of posterior compartment of leg

Popliteus
Origin
O: lateral surface of lateral condyle of femur and lateral meniscus
Deep muscle group of posterior compartment of leg

Popliteus
Insertion
I: posterior surface of tibia, superior to soleal line
Deep muscle group of posterior compartment of leg

Popliteus
Action
A: weakly flexes knee and unlocks it by rotation femur 5° on fixed tibia; medially rotates tibia of unplanted limb
Deep muscle group of posterior compartment of leg

Popliteus
Innervation
N: tibial nerve
Deep muscle group of posterior compartment of leg

Flexor hallucis longus
Orgin
O: inferior 2/3 of posterior surface of fibula; inferior part of interosseous membrane
Deep muscle group of posterior compartment of leg

Flexor hallucis longus
Insertion
I: base of distal phalanx of great toe (hallux)
Deep muscle group of posterior compartment of leg

Flexor hallucis longus
Action
A: flexes great toe at all joints; weakly plantarflexes ankle; supports medial longitudinal arches of foot
Deep muscle group of posterior compartment of leg

Flexor hallucis longus
Innervation
N: tibial nerve
Deep muscle group of posterior compartment of leg

Flexor digitorum longus
Origin
O: medial part of posterior surface of tibia inferior to soleal line; by a broad tendon to fibula
Deep muscle group of posterior compartment of leg

Flexor digitorum longus
Insertion
I: bases of distal phalanges of lateral 4 digits
Deep muscle group of posterior compartment of leg

Flexor digitorum longus
Action
A: flexes lateral 4 digits; plantarflexes ankle; supports longitudinal arches of foot
Deep muscle group of posterior compartment of leg

Flexor digitorum longus
Innervation
N: tibial nerve
Deep muscle group of posterior compartment of leg

Tibialis posterior
Origin
O: interosseous membrane; posterior surface of tibia inferior to soleal line; posterior surface of fibula
Deep muscle group of posterior compartment of leg

Tibialis posterior
Insertion
I: tuberosity of navicular, cuneiform and cuboid; bases of 2nd, 3rd and 4th metatarsals
Deep muscle group of posterior compartment of leg

Tibialis posterior
Action
A: plantarflexes ankle; inverts foot
Deep muscle group of posterior compartment of leg

Tibialis posterior
Innervation
N: tibial nerve
Muscles of the foot: 4 Layers

First Layer
Flexor digitorum brevis
Origin
O: medial tubercle of tuberosity of calcaneus; plantar aponeurosis; intermuscular septa
Muscles of the foot: 4 Layers

First Layer
Flexor digitorum brevis
Insertion
I: both sides of middle phalanges of lateral 4 digits
Muscles of the foot: 4 Layers

First Layer
Flexor digitorum brevis
Action
A: flexes lateral 4 digits
Muscles of the foot: 4 Layers

First Layer
Flexor digitorum brevis
Innervation
N: medial plantar nerve
Muscles of the foot: 4 Layers

First Layer
Abductor hallucis
Origin
O: medial tubercle of tuberosity of calcaneus; flexor retinaculum; plantar aponeurosis
Muscles of the foot: 4 Layers

First Layer
Abductor hallucis
Insertion
I: medial side of base of proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

First Layer
Abductor hallucis
Action
A: abducts and flexes 1st digit (great toe, hallux)
Muscles of the foot: 4 Layers

First Layer
Abductor hallucis
Innervation
N: medial plantar nerve
Muscles of the foot: 4 Layers

First Layer
Abductor digiti minimi
Origin
O: medial and lateral tubercles of tuberosity of calcaneus; plantar aponeurosis; intermuscular
septa
Muscles of the foot: 4 Layers

First Layer
Abductor digiti minimi
Insertion
I: lateral side of base of proximal phalanx of 5th digit
Muscles of the foot: 4 Layers

First Layer
Abductor digiti minimi
Action
A: abducts and flexes little toe (5th digit)
Muscles of the foot: 4 Layers

First Layer
Abductor digiti minimi
Innervation
N: lateral plantar nerve
Muscles of the foot: 4 Layers

Second Layer
Quadratus plantae
Origin
O: medial surface and lateral margin of plantar surface of calcaneus
Muscles of the foot: 4 Layers

Second Layer
Quadratus plantae
Insertion
I: posterolateral margin of tendon of flexor digitorum longus
Muscles of the foot: 4 Layers

Second Layer
Quadratus plantae
Action
A: assists flexor digitorum longus in flexing lateral 4 digits
Muscles of the foot: 4 Layers

Second Layer
Quadratus plantae
Innervation
N: lateral plantar nerve
Muscles of the foot: 4 Layers

Second Layer
Lumbricals
Origin
O: tendons of flexor digitorum longus
Muscles of the foot: 4 Layers

Second Layer
Lumbricals
Insertion
I: medial aspect of expansion over lateral 4 digits
Muscles of the foot: 4 Layers

Second Layer
Lumbricals
Action
A: flex proximal phalanges, extend middle and distal phalanges of lateral 4 digits (toes)
Muscles of the foot: 4 Layers

Second Layer
Lumbricals
Innervation
N: medial one: medial plantar nerve

lateral one: lateral plantar
nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Origin
O: plantar surface of cuboid and lateral cuneiforms
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Insertion
I: both sides of base of proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Action
A: flexes proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Innervation
N: medial plantar nerve
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Origin
O: oblique head: bases of metatarsals 2-4
transverse head: plantar ligaments of metatarsophalangeal joints
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Insertion
I: tendons of both heads attach to lateral side of base of proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Second Layer
Lumbricals
Innervation
N: medial one: medial plantar nerve

lateral one: lateral plantar
nerve
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Action
A: traditionally said to adduct 1st digit; assists in transverse arch of foot by metatarsals medially
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Innervation
N: deep branch of lateral plantar nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Origin
O: plantar surface of cuboid and lateral cuneiforms
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Insertion
I: both sides of base of proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Origin
O: base of 5th metatarsal
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Action
A: flexes proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Insertion
I: base of proximal phalanx of 5th digit
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Action
A: flexes proximal phalanx of 5th digit, thereby assisting with its flexion
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Innervation
N: medial plantar nerve
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Origin
O: oblique head: bases of metatarsals 2-4
transverse head: plantar ligaments of metatarsophalangeal joints
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Innervation
N: superficial branch of lateral plantar nerve
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Insertion
I: tendons of both heads attach to lateral side of base of proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Fourth Layer
Plantar interossei (3 muscles)
Origin
O: bases and medial sides of metatarsals 3-5
Muscles of the foot: 4 Layers

Fourth Layer
Plantar interossei (3 muscles)
Insertion
I: medial sides of bases of phalanges of 3rd-5th digits
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Action
A: traditionally said to adduct 1st digit; assists in transverse arch of foot by metatarsals medially
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Innervation
N: deep branch of lateral plantar nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Origin
O: base of 5th metatarsal
Muscles of the foot: 4 Layers

Second Layer
Lumbricals
Innervation
N: medial one: medial plantar nerve

lateral one: lateral plantar
nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Insertion
I: base of proximal phalanx of 5th digit
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Action
A: flexes proximal phalanx of 5th digit, thereby assisting with its flexion
Muscles of the foot: 4 Layers

Second Layer
Lumbricals
Innervation
N: medial one: medial plantar nerve

lateral one: lateral plantar
nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Origin
O: plantar surface of cuboid and lateral cuneiforms
Deep muscle group of posterior compartment of leg

Flexor hallucis longus
Insertion
I: base of distal phalanx of great toe (hallux)
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Origin
O: plantar surface of cuboid and lateral cuneiforms
Deep muscle group of posterior compartment of leg

Flexor hallucis longus
Action
A: flexes great toe at all joints; weakly plantarflexes ankle; supports medial longitudinal arches of foot
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Innervation
N: superficial branch of lateral plantar nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Insertion
I: both sides of base of proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Fourth Layer
Plantar interossei (3 muscles)
Origin
O: bases and medial sides of metatarsals 3-5
Deep muscle group of posterior compartment of leg

Flexor hallucis longus
Innervation
N: tibial nerve
Muscles of the foot: 4 Layers

Fourth Layer
Plantar interossei (3 muscles)
Insertion
I: medial sides of bases of phalanges of 3rd-5th digits
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Action
A: flexes proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Insertion
I: both sides of base of proximal phalanx of 1st digit
Deep muscle group of posterior compartment of leg

Flexor digitorum longus
Origin
O: medial part of posterior surface of tibia inferior to soleal line; by a broad tendon to fibula
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Action
A: flexes proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Innervation
N: medial plantar nerve
Deep muscle group of posterior compartment of leg

Flexor digitorum longus
Insertion
I: bases of distal phalanges of lateral 4 digits
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Origin
O: oblique head: bases of metatarsals 2-4
transverse head: plantar ligaments of metatarsophalangeal joints
Deep muscle group of posterior compartment of leg

Flexor digitorum longus
Action
A: flexes lateral 4 digits; plantarflexes ankle; supports longitudinal arches of foot
Deep muscle group of posterior compartment of leg

Flexor digitorum longus
Innervation
N: tibial nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor hallucis brevis
Innervation
N: medial plantar nerve
Deep muscle group of posterior compartment of leg

Tibialis posterior
Origin
O: interosseous membrane; posterior surface of tibia inferior to soleal line; posterior surface of fibula
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Insertion
I: tendons of both heads attach to lateral side of base of proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Action
A: traditionally said to adduct 1st digit; assists in transverse arch of foot by metatarsals medially
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Origin
O: oblique head: bases of metatarsals 2-4
transverse head: plantar ligaments of metatarsophalangeal joints
Deep muscle group of posterior compartment of leg

Tibialis posterior
Insertion
I: tuberosity of navicular, cuneiform and cuboid; bases of 2nd, 3rd and 4th metatarsals
Deep muscle group of posterior compartment of leg

Tibialis posterior
Action
A: plantarflexes ankle; inverts foot
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Insertion
I: tendons of both heads attach to lateral side of base of proximal phalanx of 1st digit
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Innervation
N: deep branch of lateral plantar nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Origin
O: base of 5th metatarsal
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Action
A: traditionally said to adduct 1st digit; assists in transverse arch of foot by metatarsals medially
Deep muscle group of posterior compartment of leg

Tibialis posterior
Innervation
N: tibial nerve
Muscles of the foot: 4 Layers

First Layer
Flexor digitorum brevis
Origin
O: medial tubercle of tuberosity of calcaneus; plantar aponeurosis; intermuscular septa
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Insertion
I: base of proximal phalanx of 5th digit
Muscles of the foot: 4 Layers

Thrid Layer
Adductor hallucis
Innervation
N: deep branch of lateral plantar nerve
Muscles of the foot: 4 Layers

First Layer
Flexor digitorum brevis
Insertion
I: both sides of middle phalanges of lateral 4 digits
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Action
A: flexes proximal phalanx of 5th digit, thereby assisting with its flexion
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Origin
O: base of 5th metatarsal
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Insertion
I: base of proximal phalanx of 5th digit
Muscles of the foot: 4 Layers

First Layer
Flexor digitorum brevis
Action
A: flexes lateral 4 digits
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Innervation
N: superficial branch of lateral plantar nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Action
A: flexes proximal phalanx of 5th digit, thereby assisting with its flexion
Muscles of the foot: 4 Layers

Fourth Layer
Plantar interossei (3 muscles)
Origin
O: bases and medial sides of metatarsals 3-5
Muscles of the foot: 4 Layers

First Layer
Flexor digitorum brevis
Innervation
N: medial plantar nerve
Muscles of the foot: 4 Layers

Thrid Layer
Flexor digiti minimi brevis
Innervation
N: superficial branch of lateral plantar nerve
Muscles of the foot: 4 Layers

Fourth Layer
Plantar interossei (3 muscles)
Insertion
I: medial sides of bases of phalanges of 3rd-5th digits
Muscles of the foot: 4 Layers

Fourth Layer
Plantar interossei (3 muscles)
Origin
O: bases and medial sides of metatarsals 3-5
Muscles of the foot: 4 Layers

Fourth Layer
Plantar interossei (3 muscles)
Insertion
I: medial sides of bases of phalanges of 3rd-5th digits
Muscles of the foot: 4 Layers
Fourth Layer

Plantar interossei (3 muscles)
Insertion
I: medial sides of bases of phalanges of 3rd-5th digits
Muscles of the foot: 4 Layers
Fourth Layer

Plantar interossei (3 muscles)
Action
A: adduct digits (2-4) and flex metatarsophalangeal joints
Muscles of the foot: 4 Layers
Fourth Layer

Plantar interossei (3 muscles)
Innervation
N: lateral plantar nerve
Muscles of the foot: 4 Layers
Fourth Layer

Dorsal interossei (4 muscles)
Origin
O: adjacent sides of metatarsals 1-5
Muscles of the foot: 4 Layers
Fourth Layer

Dorsal interossei (4 muscles)
Insertion
I: 1st: medial side of proximal phalanx of 2nd digit
2nd-4th: lateral sides of 2nd-4th digits
Muscles of the foot: 4 Layers
Fourth Layer

Dorsal interossei (4 muscles)
Action
A: abduct digits (2-4) and flex metatarsophalangeal joints
Muscles of the foot: 4 Layers
Fourth Layer

Dorsal interossei (4 muscles)
Innervation
N: lateral plantar nerve
Quadratus Femoris
Action
Laterally rotate thigh; steadies femoral head in acetabulum
Quadratus Femoris
Innervation
Nerve to the quadratus femoris
External Urethral sphincter
Origin
Internal surface of ischiopubic ramus and ischial tuberositiy
External Urethral sphincter
Insertion
surrounds urethra; in males also ascends anterior aspect of prostate; in females some fibers also enclose vagina
External Urethral sphincter
Action
compresses urethra to maintain urinary continence; in females; urethrovaginal sphincter protion also compresses vagina
External Urethral sphincter
Innervation
Deep branch of perineal nerve, a branch of pudendal nerve
Bulbospongiousus
Origin
male; medial raphe, ventral surface of bulb of penis and perineal body, female:perineal body
Bulbospongiousus
Insertion
Male: corpus spongiosum, cavernosum annd fascia of bulb of penis.
Female: fascia of corpus cavernosum of clitoris
Bulbospongiousus
Action
Male: compresses the bulb of penis to expel last drops of urine or semen; assist in erection

Female: "sphincter" of vagina and assists in erection of clitoris
Bulbospongiousus
Innervation
Deep branch of perenial nerve, branch of pudendal nerve
Ischiocarnosus
Origin
internal surface of ischio pubic ramus and ishial tuberosity
Ischiocarnosus
Insertion
crus of penis and clitoris
Ischiocarnosus
Action
Maintains erection of penis or clitoris by compressing outflow of veins and pushing blood into body of penis or clitoris
Ischiocarnosus
Innervation
Deep branch of perineal nerve, branch of pudendal nerve
Superficial transverse perineal muscle
Origin
Internal surface of ischiopubic ramus and ishial tuberosity