GENERAL HISTOLOGY

Detailed explanation-1: -The starfish nervous system comprises radial nerve cords located in each of the five arms and linked by a circumoral nerve ring located in the central disk region.

Detailed explanation-2: -The radial nerve aids arm, wrist, hand and finger movements. It also sends touch, pain and temperature sensations to the brain. Part of the peripheral nervous system, the radial nerve runs down the back of the arm from the armpit to the hand.

Detailed explanation-3: -Median nerve. This nerve passes down the inside of the arm and crosses the front of the elbow. At the wrist it goes through a “tunnel"-called the carpal tunnel-made up of the wrist bones and a tough band of connective tissue (ligament). The median nerve supplies muscles that help bend the wrist and fingers.

Detailed explanation-4: -The Radial Nerve branches off to the Deep Branch after it passes through the cubital fossa and then continues as the Posterior Interosseous Nerve after it passes between the supinator muscle heads.

Detailed explanation-5: -The radial nerve arises in the axillary region and descends down along the posterior surface of the humerus. It then passes through the cubital fossa and terminates in the posterior compartment of the forearm, by dividing into two terminal branches: superficial (sensory) and deep (motor).