BRACHIAL PLEXUS

 The brachial plexus is the network of nerves that sends signals from spinal cord to shoulder, arm and hand.

The plexus consists of Roots, Trunks, Dvisions, Cords and Branches.

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Roots:-

Generally , They originated at C5-C8 and T1.

The origin of the plexus may shift by one segment either upward or downward, resulting in a prefixed or postfixed plexus respectively.

Trunks:-

 • Roots C5 and C6 join to form the upper trunk.

 • Root C7 forms the middle trunk.

 • Roots C8 and T1 join to form the lower trunk.

Divisions :-

 • Each trunk (three in number) divides into ventral and dorsal divisions

 • These divisions join to form cords.

Cords:-

 1. The lateral cord is formed by the union of ventral divisions of the upper and middle trunks (two divisions).

 2. The medial cord is formed by the ventral division of the lower trunk (one division).

 3. The posterior cord is formed by union of the dorsal divisions of all the three trunks (three divisions).

Branches:-

 from lateral to medial

 • Musculocutaneous

 • Axillary

 • Radial

 • Median

 • Ulnar

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Blood Supply of Brachial Plexus:-

 • Vertebral artery and thyrocervical trunk with its branches,

 • suprascapular and transverse cervical arteries

supply blood to the brachial plexus.

CLINICAL ANATOMY

 • Injury to it cause Erb's Paralysis, Klumpke's Paralaysis etc.

Written by: RB Sah, MBBS 

Reference: ANATOMY book for MBBS BD Chaurasiya , and other.