Medicograspers | Neuroanatomy notes | Brachial plexus terminal branches |

Brachial plexus terminal branches:

My Aunty Raped My Uncle – Musculocutaneous Axillary Radial Median Ulnar nerve: Axillary and radial nerve are the branches of the posterior cord, the ulnar nerve is the branch of the medial cord and the musculocutaneous nerve is the branch of the lateral cord and the median nerve is the branch of both lateral and medial cord.

M- Musculocutaneous nerve which innervates the biceps brachii, brachialis, and coracobrachialis muscle.
U- ulnar nerve which innervates all the intrinsic muscles of the hand except thenar muscles and lateral two lumbricals.

The ulnar nerve also innervates flexor carpi ulnaris and the medial part of the flexor digitorum profundus while crossing the forearm.

The sensory innervation of the ulnar nerve – it innervates medially, little finger and half of the ring finger both on the palmar and dorsal surface of the hand.
The median nerve is found anterior to the axillary artery.

The median nerve innervates the thenar muscles and 2 lateral lumbricals of the hand.

The median nerve innervates the skin on the lateral 3 digits and half of the ring finger on the hand on the palmar surface and tips of the same 3 digits on the dorsal surface of the hand.

The axillary nerve innervates the deltoid muscle, teres minor, and the long head of the triceps brachii.

The superior lateral brachial cutaneous nerve is the continuation of the posterior cord of the axillary nerve. This nerve innervates the skin on the deltoid area.

The lateral cutaneous nerve of the forearm is the termination of the musculocutaneous nerve and its sensory innervation is the lateral part of the forearm.

The radial nerve innervates all the muscles of the posterior compartment of the arm and forearm. This is motor innervation.

Sensory innervation – dorsal part of arm and forearm and hand. Dorsal surface of the Lateral 3 digits and half of the ring finger excluding the tips of the digits.