Covers the muscles of the thigh by compartment: the anterior group with psoas major, iliacus, sartorius and the four quadriceps heads, the posterior hamstring group, and the medial adductor group with pectineus, gracilis and obturator externus. Each muscle is listed with origin, insertion, innervation and action. It then describes the fascia lata, its attachments, the fibrous sheaths it forms, and the saphenous opening covered by cribriform fascia.
Topic 42 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 7 sections, about 753 words (5 min of reading), with 10 flashcards.
In this note
THIGH MUSCLES
Anterior compartment :
Posterior Compartment : → Sciatic nerve.
Medial Compartment :
FASCIA LATA
Attachments :
Transverse cut :
Anterior compartment :
① Psoas major m.
Origin - Transverse processes of lumbar vertebra and bodies, IV discs
Insertion - Lesser trochanter
Innervation - Anterior rami of lumbar nerves
Action - Flexes thigh at hip and stabilizes hip joint
② iliacus m
Origin - Iliac crest, iliac fossa, ala of sacrum, anterior sacroiliac ligaments
Insertion - Lesser trochanter/tendon of psoas major
Innervation - Femoral nerve
Action - Flexes thigh at hip and stabilizes hip joint
③ Sartorius m.
Origin - Anterior superior iliac spine/notch below it
Insertion - Superior medial surface of tibia
Innervation - Femoral nerve
Action - Flexion, abduction, lateral rotation of thigh and flexion at knee join
④ Quadriceps m. (4 muscles) → N: Femoral n.
4.1 Rectus femoris m. (1st head) (2nd head)
Origin - Anterior inferior iliac spine, superior to acetabulum
Insertion - Base of patella via quadriceps tendon and tibial tuberosity via patellar ligament
Innervation - Femoral nerve
Action - Extension of leg at knee joint, flexes thigh, stabilizes hip joint
4.2 Vastus lateralis (1st head) (2nd head)
Origin - Greater trochanter/lateral lip of linea aspera
Insertion - Base of patella via quadriceps tendon and tibial tuberosity via patellar ligament
Insertion - Tibia and patella by lateral patellar retinaculum
Innervation - Femoral nerve
Action - Extension of leg at knee joint
4.3 Vastus medialis (2 heads)
Origin - Intertrochanteric line, medial lip of linea aspera
Insertion - Base of patella via quadriceps tendon and tibial tuberosity via patellar ligament
Insertion - Tibia and patella by medial patellar retinaculum
Innervation - Femoral nerve
Action - Extension of leg at knee joint
4.4 Vastus Intermedius beneath Rectus femoris m.
Origin - Anterior and lateral surface of femur
Insertion - Base of patella via quadriceps tendon and tibial tuberosity via patellar ligament
Innervation - Femoral nerve
Action - Extension of leg at knee joint
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