MRCP UK EXAMINATIONS

Detailed explanation-1: -The brachial plexus provides somatic motor and sensory innervation to the upper extremity, including the scapular region. As the brachial plexus travels through the posterior triangle of the neck into the axilla, arm, forearm, and hand, it contains various named regions based on how the plexus is formed.

Detailed explanation-2: -The brachial plexus is responsible for cutaneous and muscular innervation of the entire upper limb, with two exceptions: the trapezius muscle innervated by the spinal accessory nerve (CN XI) and an area of skin near the axilla innervated by the intercostobrachial nerve.

Detailed explanation-3: -The brachial plexus is a bundle of nerves that stems from nerve roots in the cervical (neck) and upper trunk (torso) sections of the spinal cord (C5-T1), creating a network that connects to the nerves in the arm.

Detailed explanation-4: -The medial brachial cutaneous nerve, also called the medial cutaneous nerve of the arm, arises from the medial cord carrying fibers of C8 and T1 spinal nerves. This nerve provides sensory innervation to the skin of the inferior portion of the medial side of the arm.