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BMS 301 (47)

Muscles of thigh, femoral triangle

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Colorado State University
Biomedical Science
BMS 301
Mark Frasier

5 September Cruciate ligaments prevent hyperextension Knee naturally wants to hyperextend while standing Thigh Anterior Femoral nerve Hip flexors; primarily knee extensors Iliopsoas Psoas + iliacus Psoas – lumbar vertebrae → lesser trochanter Iliacus –iliac fossa → lesser trochanter Primary hip flexors of body First move of walking Nerve supply: L2 & 3, femoral nerve Sartorius Crosses anterior thigh obliquely Anterior superior iliac spine → medial proximal tibia Superficial Femoral nerve Quadriceps femoris Rectus femoris Superficial, most anterior. Only one that crosses hip Vastus lateralis, vastus intermedius, vastus medialis All converge on tibial tuberosity via patellar ligament Knee extensors Rectus femoris can be hip flexor Propulsive Posterior Collectively – “hamstrings” Arise from ischial tuberosity Sciatic nerve – tibial portion Hip extensors, knee flexors Control momentum Limit hip flexion Lateral area Biceps femoris Long head Ischial tuberosity → fibula Short head Linea aspera → fibula Only hamstring receiving nerve supply from peroneal nerve (part of sciatic) Medial area Semitendinosus More superficial Ischial tuberos
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