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Notes:
Appreciate the intermuscular septum divides the arm into an anterior flexor compartment and a posterior extensor compartment. Understand which muscles move which joints and how they function by their attachments. Note the median cubital vein is anterior to the strong biceps tendon that protects the cubital fossa – observe how the tendon attachment helps the biceps assist in supination. Note the relationship of the biceps tendon to the brachial artery and the median nerve (“TAN” from lateral to medial). The biceps gets a TAN.
Note the median nerve innervates the flexor compartment (note median n. in the cross section). Note the median and ulnar to not have branches or innervate structures in the arm. Follow the anterior branches from the lateral and medial cord of the brachial plexus that form the letter “M” - musculocutaneous, median and ulnar nerves. Pay particular attention to the course of the nerves at the elbow. Note that after innervating the flexor compartment of the arm the musculocutaneous passes between the biceps and the brachialis to become the lateral cutaneous nerve of the forearm (hence the term musculocutaneous).