Muscle Practical #2: Arm And Leg Muscles

Front 1

Triceps brachii

Back 1

Origins: infraglenoid tubercle of scapula; medial and posterior humerus

Insertion: olecranon of ulna

Action: elbow extension

Front 2

Biceps brachii

Back 2

Origins: coracoid process of scapula and supraglenoid tubercle of the scapula

Insertion: radial tuberosity

Actions: elbow flexion; supinates forearm

Front 3

Brachialis

Back 3

Origin: distal anterior humerus

Insertion: coronoid process of ulna

Action: elbow flexion

Front 4

Brachioradialis

Back 4

Origin: lateral distal humerus

Insertion: styloid process of radius

Action: elbow flexion

Front 5

Flexor carpi radialis

Back 5

Origin: medial epicondyle of humerus

Insertions: base of metacarpals 2 and 3

Actions: flexes wrist; abducts hand

Front 6

Flexor carpi ulnaris

Back 6

Origins: medial epicondyle of humerus; olecranon of ulna

Insertions: base of metacarpal 5; pisiform and hamate bones

Actions: flexes wrist; adducts hand

Front 7

Extensor carpi radialis longus

Back 7

Origin: lateral supracondylar ridge of humerus

Insertion: base of metacarpal 2

Actions: extends wrist; abducts hand

Front 8

Extensor carpi ulnaris

Back 8

Origins: lateral epicondyle of humerus; posterior ulna

Insertion: base of metacarpal 5

Actions: extends and adducts wrist

Front 9

Iliacus

Back 9

Origins: iliac fossa and crest and ala of sacrum

Insertions: Lesser trochanter of femur

Action: Flexes hip

Front 10

Sartorius

Back 10

Origin: anterior superior iliac spine

Insertion: medial aspect of proximal tibia

Actions: flexes, abducts, and laterally rotates hip

Front 11

Gracilis

Back 11

Origins: inferior ramus and body of pubis

Insertion: Medial tibia inferor to medial condyle

Actions: adducts hip; flexes knee; medially rotates femur

Front 12

Rectus femoris

Back 12

Origins: anterior inferior iliac spine; superior acetabulum

Insertions: patella and tibial tuberosity

Actions: extends knee; flexes hip

Front 13

Vastus lateralis

Back 13

Origins: greater trochanter; intertrochanteric line; linea aspera

Insertions: Patella and tibial tuberosity

Actions: extends and stabilizes knee

Front 14

Vastus medialis

Back 14

Origins: linea aspera; intertrochanteric line

Insertions: patella and tibial tuberosity

Action: extends knee

Front 15

Vastus intermedius

Back 15

Origin: anterior and lateral femur

Insertions: Patella and tibial tuberosity

Action: knee extension

Front 16

Tensor fasciae latae

Back 16

Origins: anterior iliac crest; anterior superior iliac spine

Insertion: iliotibial tract

Action: steadies leg and trunk

Front 17

Gluteus maximus

Back 17

Origins: dorsal ilium; sacrum; and coccyx

Insertions: gluteal tuberosity of femur; iliotibial tract

Action: extends hip

Front 18

Gluteus medius

Back 18

Origin: upper lateral surface of ilium

Insertion: greater trochanter of femur

Actions: abducts hip; medial rotation of femur

Front 19

Biceps femoris

Back 19

Origins: ischial tuberosity; linea aspera; distal femur

Insertions: head of fibula; lateral condyle of tibia

Actions: Extends hip; flexes knee

Front 20

Semitendinosus

Back 20

Origin: ischial tuberosity

Insertion: medial aspect of upper tibial shaft

Actions: Extends hip; flexes knee

Front 21

Semimembranosus

Back 21

Origin: ischial tuberosity

Insertions: medial condyle of tibia; lateral condyle of femur

Actions: Extends hip; flexes knee

Front 22

Tibialis anterior

Back 22

Origin: lateral condyle of proximal tibia

Insertions: first cuneiform; metatarsal 1

Action: dorsiflexion of ankle

Front 23

Fibularis (peroneus) longus

Back 23

Origins: head and upper later fibula

Insertions: metatarsal 1

Action: Dorsiflexes ankle, everts foot

Front 24

Gastrocnemius

Back 24

Origins: medial and lateral condyles of femur

Insertion: calcaneus via calcaneal tendon

Action: plantar flexion of ankle

Front 25

Soleus

Back 25

Origins: superiorl tibia and fibula

Insertion: calcaneus via calcaneal tendon

Action: plantar flexion of ankle