Unit 3 Muscles Origin Insertion action and innervation

Psoas minor Origin

T12-L1 vertebral bodies and discs

Psoas Minor Insertion

Pectineal Line , superior pubic ramus

psoas minor action

Lumbar spine flexion, posterior pelvic tilt

psoas minor innervation

anterior rami (L1)

Psoas Major Origin

T12-L5 transverse process, vertebral bodies and discs

Psoas Major Insertion

Lesser Trochanter of femur

psoas major action

Flexes and externally rotates thigh at hip joint; flexes trunk (psoasmajor)

psoas major innervation

anterior rami (L1-L3)

Iliacus Origin

Iliac fossa

Illiacus Insertion

Lesser trochanter of femur

illiacus action

Flexes and externally rotates thigh at hip joint; flexes trunk

iliacus innervation

femoral n. (L2-L4)

sartorius origin

anterior superior illiac spine

Sartorius insertion

Pes anserinus

sartorius action

Flexes thigh at hip joint and flexes leg at knee joint

sartorius innervation

femoral n. (L2-L4)

Rectus femoris origin

Anterior inferior illiac spine

Rectus femoris insertion

quadricep femoris tendon

rectus femoris action

flexes thigh at hip joint and extends

rectus femoris innervation

femoral n. (L2-L4)

Vastus Lateralis origin

lateral length of femur

Vastus lateralis insertion

quadricep femoris tendon

Vastus lateralis action

extends leg at knee joint

Vastus lateralis innervation

femoral n. (L2-L4)

vastus medialis origin

medial femur

Vastus medialis insertion

Quadriceps femoris tendon

Vastus medialis action

extends leg at knee joint

vastus medialis innervation

femoral n. (L2-L4)

Vastus intermedius origin

anterior femur

vastus intermedius insertion

quadriceps femoris tendon

vastus intermedius action

extends leg at knee joint

vastus intermedius innervation

femoral n. (L2-L4)

what innervates the anterior compartment of thigh (except psoas minor and major)?

femoral n. (L2-L4)

what are the muscles in the medial compartment of the thigh?

• pectineus

• adductor longus

• adductor magnus

• gracilis

• obturator externus

pectineus origin

Pectineal line of superior pubic ramus

pectineus insertion

Just below trochanter of femur

pectineus action

adducts and flexes thigh at hip joint

pectineus innervation

femoral n. (L2-L4)

adductor longus origin

body of pubis

adductor longus insertion

linea aspera

adductor longus action

adducts and laterally rotates thigh at hip joint

adductor longus innervation

obturator n. (L2-L4)

adductor brevis origin

body of pubic and ishiopubic ramus

adductor brevis insertion

linea aspera

adductor brevis action

adducts and laterally rotates thigh at hip joint

adductor brevis innervation

obturator n. (L2-L4)

Adductor magnus (adductor part) origin

ishiopubic ramus

Adductor magnus (adductor part) insertion

linea aspera

Adductor magnus (adductor and hamstring part) action

adducts and medially rotates thigh at hip joint

Adductor magnus (adductor part) innervation

obturator n. (L2-L4)

Adductor magnus (hamstring part) origin

ischial tuberosity

Adductor magnus (hamstring part) insertion

adductor turbecle

Adductor magnus (hamstring part) innervation

tibial n. and obturator n. (L2-L4)

Gracilis origin

body and ishiopubic ramus

gracilis insertion

pes anserinus

gracilis action

adducts thigh at hip joint and flexes leg at knee joint

gracilis innervation

obturator (L2-L4)

obturator externus origin

external surface of obturator membrane and adjacent bone

obturator externus insertion

trochanteric fossa

obturator externus action

laterally rotates hip

obturator externus innervation

obturator n. (L2-L4)

what are the muscles in the posterior compartment of the thigh

• semitendinosus

• semimembranosus

• biceps femoris

semitendinosus origin

ischial tuberosity

semitendinosus insertion

pes anserinus

semitendinosus action

Flexes leg at knee joint and extends thigh at hip joint; medially rotates thigh at hip joint and leg at knee joint

semitendinosus innervation

tibial n. (L4-S3)

semimembranosus origin

ischial tuberosity

Semimembranosus insertion

Medial and posterior surface of medial tibial condyle

Semimembranosus action

Flexes leg at knee joint and extends thigh at hip joint; medially rotates thigh at hip joint and leg at knee joint

Semimembranosus innervation

tibial n. (L4-S3)

biceps femoris (long head) origin

ischial tuberosity

Biceps femoris (long head) insertion

head of fibula

Biceps femoris (short head) origin

lateral lip of linea aspera

Bicep femoris(Short head) insertion

head of fibula

biceps femoris (long head and short head) action

knee flexion, hip extension, lateral rotation of hip and knee

biceps femoris (long head) innervation

tibial n. (L4-S3)

biceps femoris (short head) innervation

common fibular n. (L4-S2)

what nerve innervates majority of the posterior compartment of the thigh except biceps femoris short head?

tibial n. (L4-S3)

what are the muscles of the anterior compartment of the leg?

• tibialis anterior

• extensor digitorum

• extensor hallucis longus

• fibularis (peroneous) tertius

Tibialis anterior origin

Lateral tibia and interosseous membrane

Tibialis anterior insertion

medial cuniform and 1st metatarsal

Tibialis anterior action

dorsiflexion of foot at ankle joint; inversion of foot

Tibialis anterior innervation

deep fibular n. (L4-S2)

extensor digitorum longus origin

proximal end of medial fibular surface and lateral tibial condyle

extensor digitorum longus insertion

distal and middle phalanges of digits 2-5

extensor digitorum longus action

extension of digits 2-5 and dorsiflexion of foot

extensor digitorum innervation

deep fibular n. (L4-S2)

extensor hallucis longus origin

middle 1/3 of medial fibular surface and interosseus membrane

extensor hallucis longus insertion

base of distal phalanx of great toe

extensor hallucis longus action

extension of great toe and dorsiflexion of foot

extensor hallucis longus innervation

deep fibular n. (L4-S2)

fibularis terties origin

distal medial surface of tibia

fibularis terties insertion

base of 5th metatarsal

fibularis terties action

dorsiflexion and plantar flexion of foot

fibularis terties innervation

deep fibular n. (L4-S2)

what nerve innervates the entire anterior compartment of the leg?

deep fibular n. (L4-S2)

what are the muscles of the lateral compartment of the leg?

• fibularis longus

• fibularis brevis

fibularis longus origin

fibular head and proximal lateral fibular surface

fibularis longus insertion

medial cuneiform and base of 1st metatarsal

fibularis longus action

eversion and plantarflexion of foot