NURSING 2LA2 Lecture Notes - Lecture 5: Gluteal Muscles, Lesser Sciatic Foramen, Greater Trochanter
Document Summary
Internal rotation of lower limb stretches the dermatomes and shifts the position of the muscle compartments. This is because at birth muscle compartments and skin of legs are externally rotated. Plexus first formed once nerves exit the intervertebral foramina. Then split into posterior (extensors) and anterior (flexors) divisions sciatic nerve made up of tibial and fibular nerve. Extensor nerve goes underneath inguinal ligament, and innervates the quads. Then becomes superficial cutaneous on the medial side of the leg. Runs along pelvic brim, exits the obturator foramen and innervates adductors of hip. Once reaching the knee the two nerves split, Tibial innervating plantar flexors, wraps around calf and innervates sole of the foot. Once muscular branches are given off, it becomes a superficial cutaneous. Tibial supplying the posterior of the leg up to the knee. Fibular supplying the very back of the calf. Innervates dorsiflexors of ankle everters of foot and extensors of foot.
