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Upper and middle trunks of the brachial plexus viewed from behind to show how depression of the shoulder or lateral abduction of the head may produce stretching and injury of the nerve cords.

Brachial Plexus

Upper and middle trunks of the brachial plexus viewed from behind to show how depression of the shoulder…

Plan of the brachial plexus.

Brachial Plexus

Plan of the brachial plexus.

The cervical and brachial nerve plexuses of the left side of the body.

Cervical and Brachial Nerve Plexuses

The cervical and brachial nerve plexuses of the left side of the body.

The plan of the cervical and brachial plexuses (nerves), somewhat simplified.

Cervical and Brachial Plexuses (Nerves)

The plan of the cervical and brachial plexuses (nerves), somewhat simplified.

Diagram of the origin and distribution of the nerves to the pectoral muscles. E.A.T., external thoracic nerve; I.A.T., internal anterior thoracic nerve; C.5, 6, 7, C.8, T.1, nerves of the brachial plexus; ART., axillary artery; CL, clavicle; SCL., subclavius muscle; P.Mr, pectoralis minor, joined to subclavius by costocoracoid membrane; P.MA, pectoralis major.

Nerves of the Pectoral Muscles

Diagram of the origin and distribution of the nerves to the pectoral muscles. E.A.T., external thoracic…

Showing the dorsal preaxial origin of the musculospiral (radial) nerve, and the ventral post-axial origin of the ulnar nerve from the brachial plexus.

Nerves of the Shoulder

Showing the dorsal preaxial origin of the musculospiral (radial) nerve, and the ventral post-axial origin…

The brachial plexus of the spinal nerves.

The Brachial Plexus of the Spinal Nerves

The brachial plexus of the spinal nerves.

The brachial plexus of the spinal nerves, and nerves of the upper extremity.

The Brachial Plexus of the Spinal Nerves

The brachial plexus of the spinal nerves, and nerves of the upper extremity.