Lab 6: Myology - Superficial & Dorsal & Ventral Hind Limb

anterior and medial hip

• iliopsoas (iliacus and psoas major)

• sartorius

iliopsoas (iliacus and psoas major): action

flexion of thigh

iliopsoas (iliacus and psoas major): origin

iliac fossa, ala of sacrum and vertebrae (T12-L5)

iliopsoas (iliacus and psoas major): insertion

lesser trochanter (femur)

sartorius: action

flexion of thigh and lateral rotation of femur

sartorius: origin

anterior superior iliac spine

sartorius: insertion

proximal shaft of tibia

medial thigh

• adductor magnus

• obturator externus

• adductor longus and brevis

• pectineus

• gracilis

adductor magnus: action

adduction and extension of thigh

adductor magnus: origin

pubic and ischium

adductor magnus: insertion

gluteal tuberosity and linea aspera (femur)

obturator externus: action

lateral rotation of thigh

obturator externus: origin

inferior edge of obturator foramen

obturator externus: insertion

greater trochanter of femur

adductor longus and brevis: action

adduction of thigh

adductor longus and brevis: origin

body and inferior ramus (pubis)

adductor longus and brevis: insertion

linea aspera

pectineus: action

adducts, flexes, and medially rotates thigh

pectineus: origin

body and ramus of the pubis

pectineus: insertion

proximal shaft of femur

gracilis: action

adduction of thigh; flexion of leg

gracilis: origin

body and ramus of the pubis

gracilis: insertion

proximal shaft of tibia

anterior thigh

• rectus femoris (quadriceps)

• vastus lateralis (quadriceps)

• vastus medialis (quadriceps)

• vastus intermedius (quadriceps)

• tensor fasciae latae

rectus femoris: action

extension of leg; flexion of thigh

rectus femoris: origin

anterior inferior iliac spine

rectus femoris: insertion

patella and tibial tuberosity

vastus lateralis: action

extension of leg

vastus lateralis: origin

greater trochanter (femur)

vastus lateralis: insertion

patella and tibial tuberosity

vastus medialis: action

extension of leg

vastus medialis: origin

intertrochanteric line and linea aspera (femur)

vastus medialis: insertion

patella and tibial tuberosity

vastus intermedius: action

extension of leg

vastus intermedius: origin

anterolateral shaft of femur

vastus intermedius: insertion

patella and tibial tuberosity

tensor fasciae latae: action

flexion, abduction, and medial rotation of thigh

tensor fasciae latae: origin

anterior superior iliac spine

tensor fasciae latae: insertion

iliotibial tract

gluteal muscles

• gluteus medius

• gluteus maximus

gluteus medius: action

abduction of thigh

gluteus medius: origin

ala (ilium)

gluteus medius: insertion

greater trochanter (femur)

gluteus maximus: action

extension, lateral rotation, and abduction of thigh

gluteus maximus: origin

ala (ilium); sacrum; coccyx

gluteus maximus: insertion

gluteul tuberosity (femur)

posterior thigh

• biceps femoris (hamstrings)

• semitendinosus

• semimembranosus

biceps femoris: action

flexion of leg; extension of thigh

biceps femoris: origin

ischial tuberosity

biceps femoris: insertion

head of fibula

semitendinosus: action

flexion of leg; extension of thigh

semitendinosus: origin

ischial tuberosity

semitendinosus: insertion

proximal shaft of tibia

semimembranosus: action

flexion of leg; extension of thigh

semimembranosus: origin

ischial tuberosity

semimembranosus: insertion

medial condyle (tibia)

anterior lower leg

• tibialis anterior

• extensor digitorum longus

• extensor hallucis longus

• fibularis (peroneus) tertius

tibialis anterior: action

dorsiflexes and inverts foot

tibialis anterior: origin

lateral condyle shaft (tibia); interosseus membrane

tibialis anterior: insertion

metatarsal I; medial cuneiform

extensor digitorum longus: action

extension of toes II-V; dorsiflexion and eversion of foot

extensor digitorum longus: origin

lateral condyle shaft (tibia): interosseus membrane

extensor digitorum longus: insertion

distal phalanges II-V

extensor hallucis longus: action

extension of great toe; dorsiflexion and inversion of the foot

extensor hallucis longus: origin

fibula; interosseus membrane

extensor hallucis longus: insertion

distal phalanx of the great toe

fibularis tertius: action

dorsiflexion and eversion of foot

fibularis tertius: origin

fibula; interosseus membrane

fibularis tertius: insertion

metatarsal V

lateral lower leg

• fibularis brevis

• fibularis longus

fibularis brevis: action

plantar flexion and eversion of foot

fibularis brevis: origin

distal shaft of fibula

fibularis brevis: insertion

metatarsal V

fibularis longus: action

plantar flexion and eversion of foot

fibularis longus: origin

proximal shaft of fibula

fibularis longus: insertion

metatarsal I; medial cuneiform

posterior superficial lower leg

• gastrocnemius (medial and lateral head)

• plantaris

• soleus

gastrocnemius: action

plantar flexion of foot; flexion of leg

gastrocnemius: origin

medial and lateral condyles (femur)

gastrocnemius: insertion

calcaneus

plantaris: action

plantar flexion of foot; flexion of leg

soleus: action

plantar flexion of foot

soleus: origin

proximal shafts of tibia and fibula

soleus: insertion

calcaneus

posterior deep lower leg

• flexor digitorum longus

• flexor hallucis longus

flexor digitorum longus: action

plantar flexion and inversion of foot; flexion of toes II-V

flexor digitorum longus: origin

mid-shaft of tibia

flexor digitorum longus: insertion

distal phalanges II-V

flexor hallucis longus: action

plantar flexion and inversion of foot; flexion of great toe

flexor hallucis longus: origin

posterior shaft of fibula; interosseus membrane

flexor hallucis longus: insertion

distal phalange of great toe