lis 



ANATOMY IN A NUTSHELL 



These two vertebral arteries unite to form the basilar artery, which runs 

 in a groove in the middle of the pons to its anterior border where it divides into 

 the posterior cerebral branch. The basilar artery gives off (A) numerous 



TRANSVERSE BRANCHES to the polls and adjacent parts, (B) THE INTERNA! 



\i [>n<n;v v.rtery which runs with the auditory uerve in the internal meatus 



> 



(C) the anterior inferior cerebellar artery which crosses the cms cere- 

 belli to the anterior border of the under surface of the cerebellum, (D) the 

 51 perior cerebellar which winds abound the crus cerebri on each side near 

 the fourth uerve to reach the upper surface of the cerebellum. 



PLATE CCXXXIX. 



ANT. SUP. 

 ANGLE. 



POST.SUF. 

 ANGLE 



POST. INF 

 ANCLE. 



FOR LATERAL 

 SINUS. 



-GROOVES FOR 

 ODLE MENINGEAL, 

 ARTERY. 



ANT. INF. 

 ANGLE. 



[nternal Surface of the Parietal Bone. 



(2) The internal mammary arises from the first portion of the subclavian 

 artery opposite the thyroid axis and descends on the posterior surfaces of the 

 costal cartilages to the sixth interspace where it divides into the musculo* 

 phrenic and the superior epigastric branches. As it passes down it is about a 

 half an inch fromthe sternal margin. The branches of the internal mammary 

 are (a i COMES \Kuvi phrenici which accompanies the phrenic nerve to the 

 Diaphragm, (b) the mediastinal branch which passes to the anterior med- 

 iastinum, (c) pericardiac which passes to the anterior surface of the pericardium, 



(d) sternal branches which pass to the posterior surface of the sternum, 



(e) interior [ntercostal branches which pass to the five or six upper in- 

 terspaces where each branch divides inio two divisions to pass along the mar- 



