. Cunningham's Text-book of anatomy. Anatomy. 714 THE NEKVOUS SYSTEM. forwards in the first intercostal space and supplies the intercostal muscles. It usually gives off no anterior branch to the skin of the chest and no lateral cutaneous branch. In some cases a lateral cutaneous branch emerges from the side of the first intercostal space. This may be derived from the first nerve, or it may be the intercosto-brachial nerve, the lateral branch of the second thoracic nerve. In many cases an anterior cutaneous branch perforates the first intercostal space and supplies the skin on the front of the
. Cunningham's Text-book of anatomy. Anatomy. 714 THE NEKVOUS SYSTEM. forwards in the first intercostal space and supplies the intercostal muscles. It usually gives off no anterior branch to the skin of the chest and no lateral cutaneous branch. In some cases a lateral cutaneous branch emerges from the side of the first intercostal space. This may be derived from the first nerve, or it may be the intercosto-brachial nerve, the lateral branch of the second thoracic nerve. In many cases an anterior cutaneous branch perforates the first intercostal space and supplies the skin on the front of the chest. This branch, similarly, is sometimes traceable to the second thoracic nerve. Communications.—Besides its junction with the eighth cervical to form the brachial plexus, the first thoracic nerve effects the following communications:—(a) The last cervical or first thoracic ganglion of the sympathetic sends a gray ramus communi- cans to join the nerve on its appearance in the thorax, (b) The second thoracic nerve in a majority of cases communicates with the first. This communication varies considerably in size and distribution. It may reinforce the intercostal branch of the nerve, it may send one branch to the intercostal portion and another to the part of the nerve joining the Anterior column of spinal medulla Posterior column of spinal medulla Posterior nerve-root Anterior nerve-root | Spinal gang! Posterior ramus (medial branch) Posterior ramus s Posterior ramus llateral branch > "a^ 1 branch (uniting with a sympathetic branch). Gray ramus coinmunicans Splanchnic branch (white ramus--,* coinmunicans)* Anterior ramnss£ ' Gangliated sympathetic trunk Efferent (vaso-uiotor) branch Lateral branch (posterior subdivision)"]^ Lateral branch _£__ Anterior branch Lateral branch (anterior subdivision). Cardinal vein Mesentery Intestinal canal Fig. 622.—Scheme op the Distribution of a Typical Spinal Nerve. brachial plexus, or it may consist of a nerve proc
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