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Transverse cervical (colli) nerve. N. transversus colli. Arises from C3 and is the third nerve occupying the "nerve point" at the posterior margin of the middle third of the sternocleidomastoid muscle where it turns anteriorly and passes beneath the platysma to supply the skin. It receives motor fibers for the platysma from the cervical branch of the facial nerve. B Superior branches. Rami superiores. They ascend to the suprahyoid region. B Inferior branches. Rami inferiores. They descend to the infrahyoid region. B Supraclavicular nerves. Nn. supraclaviculares. Cutaneous branches from C3-4. They spread out fanlike to the shoulder and clavicular regions. B Medial supraclavicular nerves. Nn. supra-claviculares mediales. They pass over the middle third of the clavicle and supply the skin of the neck in this region and the thorax as far as the sternal angle, as well as the sternoclavicular joint. B

Intermediate supraclavicular nerves. Nn. su-

praclaviculares intermedii. They descend beneath the platysma and over the middle third of the clavicle to supply the skin up to the 4th rib. B

Lateral (posterior) supraclavicular nerves.

Nn. supraclaviculares laterales (posteriores). Posterior group of nerves supplying the skin over the acromion, deltoid muscle and the acromio-clavicular joint. B

Phrenic nerve. N. phrenicus. It arises from C4 with additional rami from C3 and C5, extends on the scalenus anterior muscle, then passes through the middle mediastinum to the diaphragm. Some of its fibers extend further into the peritoneum. A C

Pericardial branch. Ramus pericardiacus. Slender branch to the anterior surface of the pericardium. A

Phrenicoabdominal branches. Rami phreni-coabdominales. Fibers supplying the peritoneum up to the gallbladder and pancreas. On the right side they pass through the foramen for the vena cava, on the left side further anteriorly through the diaphragm near the left margin of the heart. A Accessory phrenic nerves. Nn. phrenici acces-sorii. Frequent additional roots of the phrenic nerve from C5 and C6 via the nerve to the sub-clavius. A C

BRACHIAL PLEXUS. Plexus brachialis. Nerve plexus formed by the anterior rami of spinal nerves C5-T1. Supplying the arm and part of the shoulder girdle, it passes between the scalenus anterior and medius extending as far as the head of the humerus. C Nerve roots. Radices.

Trunks. Trunci. Three primary trunks make up the brachial plexus and each is usually formed from one or two anterior rami of spinal nerves. Upper trunk. Truncus superior. Formed by the union of C5 and C6 spinal nerves, it generally arises lateral to the scalenus gap. C

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