Anatomy Wokrshop Pelvis, hip and femur (myology 1) 분당서울대학교병원 정형외과 성기혁

Anterior muscles of pelvis

Psoas major Origin : T12-L5 vertebra Insertion : lesser trochanter Action : powerful hip flexion Innervation: femoral N.

Psoas minor Origin : T12 & L1 vertebra Insertion : pectineal line Action : weak flexion of trunk

Iliacus Origin : iliac fossa Insertion : lesser trochanter Action : powerful hip flexion Innervation: Femoral N.

Gluteal muscles

Gluteus maximus Origin : ilium & dorsal sacrum Insertion 1. gluteal tuberosity 2. iliotibial band Action 1. powerful extension 2. ER of hip Innervation: inferior gluteal N. Gluteus maximus

Gluteus medius Origin:ilium between anterior & posterior gluteal lines Insertion: greater trochanter Action: 1. powerful abduction 2. IR of hip 3. Balancing during walking Innervation : superior gluteal N. Gluteus medius

Gluteus minimus Origin: ilium between anterior & inferior gluteal lines Insertion: anterior greater trochanter Action: 1. abduction & IR of hip 2. Assist gluteus medius during walking

Trendelenburg sign

Piriformis Origin: anterior sacrum Insertion: superior greater trochanter Action: 1. hip ER 2. hip abduction during flexion

Obturator internus Origin 1. ischiopubic rami 2.obturator membrane Insertion: medial greater trochanter Action: 1. hip ER 2. hip abduction during flexion

Superior & Inferior gemellus Origin: ischial spine(sup.) ischial tuberosity(inf.) Insertion: medial greater trochanter Action: 1. hip ER 2. hip abduction during flexion

Quadratus femoris Origin: ischial tuberosity Insertion: intertrochanteric crest Action: hip ER

Posterior femoral muscles (Hamstrings)

Biceps femoris(long head) Origin: ischial tuberosity Insertion: head of fibula Action: 1. hip extension 2. knee flexion & ER Innervation: tibial division of sciatic N.

Biceps femoris(short head) Origin: 1. linea aspera, 2. supracondylar line Insertion: fibula, lateral tibia Action: knee flexion & ER

Semitendinosus Origin: ischial tuberosity Insertion: proximal medial tibia Action: 1. hip extension 2. knee flexion & IR Innervation: tibial division of sciatic N.

Semimembranosus Origin: ischial tuberosity Insertion: posterior medial tibial condyle Action: 1. hip extension 2. knee flexion & IR Innervation: Tibial division of sciatic N.

Psoas & iliacus: hip flexion Gluteus medius & minimus: hip abduction & IR Gluteus maximus & hamstrings: hip extension Piriformis & short rotators: hip ER

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