Anterior Interosseous Of Forearm

The Anterior Interosseous nerve (AIN) is a branch of the median nerve, which is one of the major nerves in the forearm. It is responsible for innervating the deep muscles of the forearm, including the flexor pollicis longus, pronator quadratus, and the flexor digitorum profundus to the index and middle fingers. The AIN originates from the median nerve at the elbow and travels down the forearm alongside the interosseous membrane. It provides motor innervation to the muscles it supplies, allowing for movements such as flexion of the thumb and fingers, and pronation of the forearm. Damage to the AIN can result in weakness or paralysis of the muscles it innervates, leading to difficulty in performing movements such as flexion of the thumb and fingers, and pronation of the forearm. This can be caused by trauma, inflammation, compression, or other neurological disorders.

Median

The brachial plexus is formed by the ventral rami of c5-c8-t1 spinal nerves, and lower and upper halves of c4 and t2 spinal nerves. the plexus extends toward the armpit. the ventral rami of c5 and c6 form upper trunk, the ventral ramus of c7 forms the middle trunk, and the ventral rami of c8 and t1 join to form the lower trunk of the brachial plexus. under the clavicle, the trunks reorganize to form cords (fasciculi) around the axillary artery (arteria axillaris). the lateral cord (fasciculus lateralis) is formed by the upper and middle trunk, all three trunks join to form the posterior cord (fasciculus posterior), the lower trunk continues to the medial trunk (fasciculus medialis). the nerves (containing motor and sensory fibers) to the shoulder and to the upper limb emerge from the brachial plexus.