Lab 8: Lower Appendage Muscles

Rectus Femoris

O: anterior inferior iliac spine

I: tibial tuberosity of tibia

A: extends leg & flexes thigh

Vastus Lateralis

O: greater trochanter & linea aspera of femur

I: tibial tuberosity of tibia

A: extends leg

Vastus Intermedius

O: femur

I: tibial tuberosity of tibia

A: extends leg

Vastus Medialis

O: intertrochanteric line & linea aspera of femur

I: tibial tuberosity of tibia

A: extends leg

Sartorius

O: anterior superior iliac spine

I: tibial tuberosity of tibia

A: flexes & laterally rotates thigh

Gluteus maximus

O: iliac crest, sacrum, coccyx

I: iliotibial band, gluteal tuberosity & linea aspera of femur

A: extends & laterally rotates thigh

Gluteus medius

O: ilium

I: greater trochanter of femur

A: abducts & medially rotates thigh

Tensor Fascia Latae

O: iliac crest & anterior superior iliac spine

I: lateral condyle of tibia

A: abducts and medially rotates thigh

Gluteus minimus

O: ilium

I: greater trochanter of femur

A: abducts & medially rotates thigh

Piriformus

O: sacrum

I: greater trochanter of femur

A: laterally rotates thigh

Gemellus superior

O: ischial spine & ischial tuberosity

I: greater trochanter of femur

A: laterally rotates thigh

Obturator externus

O: ischial spine & ischial tuberosity

I: greater trochanter of femur

A: laterally rotates thigh

Gemellus inferior

O: ischial spine & ischial tuberosity

I: greater trochanter of femur

A: laterally rotates thigh

Quadratus femoris

O: ischial tuberosity

I: intertrochanteric crest of femur
A: adducts and laterally rotates thigh

Obturator internus

O: ischial spine & ischial tuberosity

I: greater trochanter of femur

A: laterally rotates thigh

Iliacus

O: iliac fossa
I: lesser trochanter of femur
A: flexes and laterally rotates thigh

Psoas major

O: T12-L5
I: lesser trochanter of femur
A: flexes & laterally rotates thigh

Gracilis

O: pubis
I: linea aspera of femur
A: adducts and flexes thigh

Adductor magnus

O: pubis & ischial tuberosity
I: linea aspera & adductor tubercle of femur
A: adducts thigh

Adductor Longus

O: pubis

I: linea aspera of femur

A: adducts & flexes thigh

Adductor brevis

O: inferior ramus of pubis
I: linea aspera of femur
A: adducts and flexes thigh

Pectineus

O: pectineal line of pubis
I: pectineal line of femur
A: adducts & flexes thigh

Biceps femoris: long + short head

O: long head: ischial tuberosity; short head: linea aspera

I: head of fibula

A: flexes leg

Semitendinosus

O: ischial tuberosity

I: proximal medial tibia

A: flexes leg & extends thigh

Semimembranosus

O: ischial tuberosity

I: medial condyle of tibia

A: flexes leg & extends thigh

Tibialis anterior

O: lateral condyle & shaft of tibia

I: metatarsal I & medial cuneiform

A: dorsiflexes & inverts foot

Extensor digitorum longus

O: lateral condyle of tibia, fibula

I: distal phalanges II-V

A: extends toes 2-5 & dorsiflexes foot

Extensor hallucis longus

O: anterior fibula

I: distal phalanx I

A: extends great toe & dorsiflexes foot

Fibularis longus

O: head & superior shaft of fibula, lateral condyle of tibia

I: metatarsal I & medial cuneiform

A: everts & plantarflexes foot

Fibularis brevis

O: fibular shaft

I: metatarsal V

A: everts foot

Gastrocnemius

O: medial & lateral condyles of femur

I: calcaneus

A: plantarflexes foot, flexes leg

Plantaris

O: lateral supracondylar ridge of femur

I: posterior calcaneus

A: weak leg & plantar flexor

Soleus

O: head & shaft of fibula, tibia

I: calcaneus

A: plantarflexes foot

Popliteus

O: lateral condyle of femur

I: proximal tibia

A: flexes leg & medially rotates tibia

Tibialis posterior

O: fibula & tibia

I: navicular, cuboid, all cuneiforms & metatarsals II-IV

A: plantarflexes & inverts foot

Flexor Hallucis Longus

O: posterior fibula

I: distal phalanx I

A: flexes great toe, plantarflexes foot

Flexor digitorum longus

O: posteromedial tibia

I: distal phalanges II-IV

A: flexes toes 2-5, plantarflexes foot

Flexor digitorum brevis

A: flexes MP and PIP joints of digits 2-5

Abductor hallucis

A: abducts great toe

Abductor digiti minimi

A: abducts toe 5

flexor retinaculum

Iliotibial band/tract

extensor retinaculum

plantar aponeurosis