Upper limb (also called upper extremity) is the region of human body which extends from the shoulder girdle to the hand. It is divided into four parts:
- Shoulder girdle.
These four parts are joined by three joints as follows:
- Shoulder joint.
- Elbow joint.
- Wrist joint.
The main artery that supplies the upper limb is the Subclavian artery that originates in the chest. Right Subclavian artery is a branch of right brachiocephalic artery which is arises directly from aorta and supply the right upper limb. Left subclavian artery arises directly from aorta and supply the left upper limb.
The upper limb is innervated by brachial plexus.Brachial plexus is formed by anterior rami of cervical spinal nerves of C5, C6, C7, C8 and the first thoracic spinal nerve T1.
Written by Fatima Khan