BIO 205 Lecture Notes - Lecture 12: Parasympathetic Nervous System, Superior Gluteal Nerve, Buttocks
14 Mar 2017
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Document Summary
The radial nerve is a continuation of the posterior cord of the brachial plexus after the axillary nerve is given off. The radial nerve courses distally along the posterior surface of the humerus between the medial and lateral heads of triceps brachii. The superficial branch of the radial nerve innervates the skin on the lateral dorsal surface of the hand and lateral palmar surface of the thenar area. (the area shaded in purple) The lumbosacral plexus supplies muscular and cutaneous innervation to the entire lower limb. The plexus is formed from the ventral rami of spinal nerves l1-s4. The lumbosacral plexus is divided into the lumbar plexus and sacral plexus based on the location of the plexuses and the anatomical areas that they supply. The lumbar plexus is located along the posterior wall of the abdomen within the substance of the psoas major muscle.
