ANATOMY IN A NUTSHELL. 



293 



LESSON LXXXIII. 



The occipital artery (Plate CXVI) is a branch from the external carotid 

 opposite the facial artery and it passes under the Stylo-hyoid muscle and the 

 posterior belly of the Digastric muscle. The twelfth cranial nerve (hypo- 

 glossal) winds around it. This artery passes upward across the spinal acces- 

 sory nerve and the internal carotid sheath to the space between the mastoid 

 process of the temporal bone and the transverse process of the atlas. It now 

 runs backward in the occipital groove on the mastoid process and pierces the 

 origin of the Trapezius muscle and passes upward in a tortuous course to the 



PLATE CXXV. 



PLEURA 



Showing Pleur.e and Root of the Lungs. 



vertex, being accompanied by the greal occipital nerve in the last part of its 

 course, while the Complexus muscle separates the artery and nerve at the 

 beginninu'. Its branches are, (1) sterno-mastoid, which passes over the hypo- 

 glossal nerve to the Sterno-cleido-mastoid muscle, (2) AURICULAR, which passes 

 to the hack of the concha, and it may send a branch through the mastoid fora- 

 men to the dura mater. (3) meningeal, which passes through the jugular 

 foramen to the dura mater. | t) ARTERIA PRIN< EPS CERVIGIS, which descends 

 along the back of the neck ami divides into two branches, (a) the superficial 

 <me which passes under the Splenius to anastomose with the superficial cervical 

 from the transversalis colli, (b) the deep branch runs under the Complexus 



