PT 5131 Lecture Notes - Piriformis Muscle, Buttocks, Perineum
29 Mar 2014
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Sacral plexus: forms on anterior surface of piriformis, arises from ventral rami of l4 s4, piriformis exits pelvis through sciatic foramen, all nerves except for superior gluteal nerve exit below piriformis in greater sciatic foramen. Superior gluteal l4 : articular branches to hip joint, muscular branches to flexors of knee in thigh and all muscles in leg and foot. Cutaneous branches to buttocks and uppermost medial and posterior surfaces of thigh. Cutaneous branches to medial part of buttocks: structures in perineum: sensory to genitalia, muscular branches to perineal muscles, external urethral sphincter, and external anal. Pelvic viscera via inferior hypogastric and pelvic plexuses. Lateral compartment of leg: motor, sensory, motor, sensory, deep peroneal nerve (l4 s1) Webbing between 1st and 2nd toe skin anterior and lateral lower leg and dorsum of foot. Joining of branches from tibial and common peroneal nerves: descends superficial to gastrocnemius, supplies skin in region superficial and inferior to gastrocnemius, including:
