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Movement at the Hip Joint • Superficial muscle of hip that forms flesh of buttock • Most important for extending hip when power is needed • Sacrum + iliac bones gluteal tuberosity of femur + iliotibial tract Movement at the Hip Joint • Ilium Femur • Hip abductor, steadies the pelvis for walking • Site for intramuscular injections • Maximus overlies the sciatic nerve Movement at the Hip Joint • • • • Iliacus and psoas major Iliac bone lesser trochanter of femur Prime mover of hip flexion Keeps upper body from falling backwards while standing Movement at the Hip Joint • • • • Form medial side of each thigh Press the thighs together Gravity does most of their work Pelvis femur (proximally) Movement at the Knee Joint • Posterior thigh • Biceps femoris, semimembranosus, semitendonosus • Ischial Tuberosity Proximal Tibia • Prime movers of thigh extension and knee flexion • Butchers use tendons to hang hams for smoking Movement at the Knee Joint • Most superficial thigh muscle, thin, and strap-like • Anterior iliac crest Medial side of Tibia • Weak thigh flexor • “Tailor’s muscle”* Movement at the Knee Joint • 1 rectus femoris & 3 vastus muscles form anterior thigh • Femur + Pelvis Tibial Tuberosity by patellar ligament • Extend the knee powerfully • Rectus femoris helps flex hip • RF + Vastus lateralis intramuscular injections sites mostly for infants Sartorius Movement at the Foot & Ankle • Superior muscle on anterior leg • Upper tibia tarsal bones • Acts to dorsiflex and invert foot Movement at the Foot & Ankle • Lateral tibial condyle + proximal radius Phalanges 2-5 of foot • Prime mover of toe flexion* • Dorsiflexor of foot Movement at the Foot & Ankle • Longus, brevis, tertius in lateral part of leg • Fibula Metatarsals • Plantar flex and evert foot Movement at the Foot & Ankle • Two-bellied muscle forms cruved calf of posterior leg • Two heads on each side of distal femur through Calcaneal/Achilles tendon heel • If tendon breaks walking is impaired, heel cannot be lifted* • Prime mover for plantar flexion • “Toe dancer’s muscle” Movement at the Foot & Ankle • Fleshy muscle, strong plantar flexor • Tibia and fibula through Calcaneal/Achilles tendon heel Lower Limb Muscles Lower Limb Muscles Questions 1. Which is the “tailor’s muscle”? A. Ipsoas C. Sartorius B. Gastrocnemius D. Rectus Femoris 2. The prime mover of toe flexion is? A. Extensor Digitorum Longus C. Ipsoas B. Tibialis Anterior D. Fibularis 3. A patient’s calcaneus/achilles tendon is cut during surgery, what will happen to him and why? Sources • Essentials of Human Anatomy, Ninth Edition Textbook http://wps.aw.com/wps/media/objects/5382/5 512191/ebook/htm/0ehap9.htm • University of Michigan Medical School http://www.med.umich.edu/lrc/coursepages/m1/a natomy2010/html/anatomytables/muscles_lowerlim b.html • Radiopaedia https://radiopaedia.org/articles/muscles-ofthe-lower-limb