ANATOMY IX A NUTSHELL. 301 



part of the scalp and the upper part of the neck; this cutaneous branch accom- 

 panies the occipital artery and communicates with thegreat occipital and small 

 occipital nerves. (Plate CXII). 



The superficial origin of the Second Spinal nerve may be as high as a little 

 above the posterior arch of the atlas or as low as midway between the 

 posterior arch of the atlas and spine of the axis. The anterior branch 

 of the second cervical nerve leaves the spinal canal between the posterior arch 

 of the atlas and the lamina of the axis, behind the vertebral artery and in front 

 of the posterior Intertransverse muscle. Then it passes to the interval between 

 the Scalenus medius and Rectus capitis amicus major where it divides into an 

 ascending branch which joins the first cervical to make the first loop, and one 

 or two descending branches which join the third cervical to make the second 

 loop of the cervical plexus. It gives off (1 ) the small occipital nerve, which 

 runs upwards and backwards to the posterior border of the Sterno-mastoid, 

 where it crosses the lower border of the spinal accessory nerve after which it 



PLATE CXXXIII. 



SUPERIOR CORNU OF HYOID BONE 

 / 



MEDIAN PORTION OF 

 CRICO-THYROID MEMBRANE 



CRICC- THYROID 

 MUSCLE 



THIRD RING OF TRACHEA 



Thyroid Cartilage. (Anterior View.) 



ascends along the posterior border to the mastoid process. Here it pierc< 

 deep fascia and crosses the upper pan of the Sterno-cleido-mastoid into the 

 superficial fascia where it divides into three branches, (a) auricular, which runs 

 upwards and forward to supply the integum< m on the inner and upper pan of 

 the pina, (b) a mastoid branch which is distributed to the skin on the' base of 

 the mastoid pre>cess, (c) the- occipital branches which passover the Occipitalis 

 muscle and are distributed to the' skin of the scalp. ( Plate' (X 1 II). 



These branches communicate with the great occipital, small occipital. 

 great auricular, all of the cervical plexus, and with the posterior auricular 

 of the fifth nerve-. (2) A branch helps to form the greal auricular, its other 

 branch comes from the cervical nerve. The meat auricular nerve passes with 

 the small occipital nerve to the posterior border of the Sterno-cleido-mastoid, 



