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 and supraglenoid tubercle of the scapula

Insertion: radial tuberosity

Actions: elbow flexion; forearm supination

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 process 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 and abducts wrist

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

Sartorius

Back 9

Origin: anterior superior iliac spine

Insertion: medial proximal tibia

Actions: flexes, abducts, and laterally rotates hip; flexes knee

Front 10

Gracilis

Back 10

Origins: inferior ramus and body of pubis

Insertion: proximal medial tibia

Actions: adducts hip; flexes knee; medially rotates femur

Front 11

Tensor fasciae latae

Back 11

Origins: anterior iliac crest; anterior superior iliac spine

Insertion: iliotibial tract

Action: steadies trunk

Front 12

Soleus

Back 12

Origins: proximal tibia and fibula

Insertion: calcaneus (via calcaneal tendon)

Action: plantar flexion of ankle

Front 13

Gastrocnemius

Back 13

Origins: medial and lateral condyles of femur

Insertion: calcaneus (via calcaneal tendon)

Action: plantar flexion of ankle

Front 14

Semimembranosus

Back 14

Origin: ischial tuberosity

Insertions: medial condyle of tibia; lateral condyle of femur

Actions: hip extension; knee flexion

Front 15

Semitendinosus

Back 15

Origin: ischial tuberosity

Insertion: medial aspect of upper tibial shaft

Actions: hip extension; knee flexion

Front 16

Biceps femoris

Back 16

Origins: ischial tuberosity; linea aspera; distal femur

Insertions: head of fibula; lateral condyle of tibia

Actions: hip extension; knee flexion

Front 17

Gluteus medius

Back 17

Origin: upper lateral surface of ilium

Insertion: greater trochanter of femur

Actions: hip abduction; medial rotation of femur

Front 18

Gluteus maximus

Back 18

Origins: dorsal ilium; sacrum; coccyx

Insertions: gluteal tuberosity of femur; iliotibial tract

Action: hip extension

Front 19

Vastus intermedius

Back 19

Origin: anterior and lateral proximal femur

Insertions: superior patella; tibial tuberosity

Action: knee extension

Front 20

Vastus lateralis

Back 20

Origins: greater trochanter; intertrochanteric line; linea aspera

Insertions: lateral patella; tibial tuberosity

Actions: knee extension; stabilizes knee

Front 21

Vastus medialis

Back 21

Origins: linea aspera; intertrochanteric line

Insertions: medial patella; tibial tuberosity

Action: knee extension

Front 22

Rectus femoris

Back 22

Origins: anterior inferior iliac spine; superior acetabulum

Insertions: tibial tuberosity; patella

Actions: knee extension; hip flexion

Front 23

Tibialis anterior

Back 23

Origin: lateral condyle of proximal tibia

Insertions: first cuneiform; metatarsal 1

Action: dorsiflexion of ankle

Front 24

Fibularis (peroneus) longus

Back 24

Origins: head and upper fibula

Insertions: metatarsal 1; medial cuneiform

Action: plantar flexion of ankle; everts foot