. Cunningham's Text-book of anatomy. Anatomy. 702 THE NEEVOUS SYSTEM. important to realise the position of origin of certain nerves. The nerves to the prevertebral muscles, the communication with the phrenic, the dorsal scapular, and long thoracic nerves, arise from the anterior rami of the nerves involved in the plexus. The supra-scapular and the nerve to the subclavius arise at the level of formation of the secondary cords; and the anterior thoracic, subscapular, and thoraco - dorsal nerves arise from the secondary cords, prior to their ultimate subdivision into the nerves of distribution fo
. Cunningham's Text-book of anatomy. Anatomy. 702 THE NEEVOUS SYSTEM. important to realise the position of origin of certain nerves. The nerves to the prevertebral muscles, the communication with the phrenic, the dorsal scapular, and long thoracic nerves, arise from the anterior rami of the nerves involved in the plexus. The supra-scapular and the nerve to the subclavius arise at the level of formation of the secondary cords; and the anterior thoracic, subscapular, and thoraco - dorsal nerves arise from the secondary cords, prior to their ultimate subdivision into the nerves of distribution for the upper limb. Pars Supraclavicularis.—The nerves derived from the plexus above the level of the clavicle are, like the main trunks, divisible into two series; anterior branches arising from the front, and posterior branches arising from the back of the plexus (Fig. 614, p. 701). Anterior Branches. 1. Nerves to scalenus anterior and longus colli. 2. Communicating nerve to join the phrenic nerve. 3. Nerve to the subclavius muscle. Posterior Branches. 1. Nerves to scaleni, medius and posterior. 2. Dorsal (posterior) scapular nerve. 3. Long thoracic nerve. 4. Supra-scapular nerve. Outer The muscular twigs to the anterior scalene and longus colli muscles arise from the lower four cervical nerves, as they emerge from the intervertebral foramina. The communicating branch to the phrenic nerve arises usually from the fifth cervical nerve at the lateral border of the anterior scalene muscle. It is sometimes absent, and occasionally an additional root is present from the sixth cervical nerve. In some instances the nerve is replaced by a branch from the nerve to the subclavius, which passes medially behind the sterno-mastoid muscle to join the phrenic at the inlet of the thorax. N. Subclavius.—The nerve to the subclavius is a slender nerve, which arises from the front of the cord formed by the fifth and sixth cervical nerves. It descends in the posterior triangle of the neck over t
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