Human anatomy, including structure and development and practical considerations . erior branch (page 1279) have already been anterior primary division (r. anterior) leaves the intervertebral foramen andalmost immediately is connected with the gangliated cord by gray and white ramicommunicantes. It then enters an intercostal space through which it coursesbetween the external and internal intercostal muscles, both of which it supplies. Atthe side of the chest it gives off a lateral cutaneous branch (r. cutaneus lateralis),which distributes a few tiny motor twigs and then pierces th
Human anatomy, including structure and development and practical considerations . erior branch (page 1279) have already been anterior primary division (r. anterior) leaves the intervertebral foramen andalmost immediately is connected with the gangliated cord by gray and white ramicommunicantes. It then enters an intercostal space through which it coursesbetween the external and internal intercostal muscles, both of which it supplies. Atthe side of the chest it gives off a lateral cutaneous branch (r. cutaneus lateralis),which distributes a few tiny motor twigs and then pierces the external intercostalmuscle to supply the skin over the lateral portion of the trunk. On reachingthe superficial fascia it usually breaks up into two branches, a larger anterior () and a smaller posterior (r. posterior). Having given off the lateralcutaneous branch, the main anterior primary division continues its forward coursenearly to the mid-line, where it pierces the muscle and becomes superficial as theanterior terminal cutaneous branch (r. cutaneus anterior).. Diagram illustrating- constitution and division of typical spinal nerve;.SC, spinal cord; AH, PR, anterior and posterior roots; SG, spinal gang-lion; CT, common trunk; AD, PD, anterior and posterior primary divis-ions; PC, LC, AC. posterior, lateral and anterior cutaneous branches;RC, ramus communicans; 6>, sympathetic ganglion and cord. THE CERVICAL PLEXUS. 1285 The intc^unKnt is therefore supplied, from dorsal to \cntral mid-line, by theposterior primary division, the posterior and anterior divisions of the lateralcutaneous branch and the anterior cutaneous branch of the anterior jjrimarydivision. The muscles derive their nerve-supply from both the anterior and theposterior ])rimary di\isions. THE CERVICAL anterior primary dixisions (rr. anteriorcs) of the eight cervical ner\es (), assisted by the iirst and second thoracic, supply the head, neck, upj)erextremity, thoracic int
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