VEINS. 



Fig. 240. The Superficial Veins of the 

 Upper Extremity. 



anterior ; and in old age it is more capacious than at an early period of life. It 

 receives veins from the pituitary body, and from the adjacent bone and dura mater. 



The Inferior Petrosal Sinus is situated in 

 the groove formed by the junction of the 

 inferior border of the petrous portion of the 

 temporal with the basilar process of the 

 occipital. It commences in front at the 

 termination of the cavernous sinus, and opens 

 behind into the jugular foramen, forming 

 with the lateral sinus the commencement of 

 the internal jugular vein. These sinuses 

 are semi-cylindrical in form. 



The Transverse Sinus is placed trans- 

 versely across the fore part of the basilar 

 process of the occipital bone, serving to 

 connect the two inferior petrosal and cavern- 

 ous sinuses. A second is occasionally found 

 opposite the foramen magnum. 



The Superior Petrosal Sinus is situated 

 along the upper border of the petrous por- 

 tion of the temporal bone, in the front part 

 of the attached margin of the tentorium. It 

 is small and narrow, and connects together 

 the cavernous and lateral sinuses at each 

 side. It receives a cerebral vein (inferior 

 lateral cerebral) from the under part of the 

 middle lobe, and a cerebellar vein (anterior 

 lateral cerebellar) from the anterior border 

 of the cerebellum. 



VEINS OF THE UPPER EXTREMITY 

 AND THORAX. 



The veins of the upper extremity are 

 divided into two sets: 1. The superficial 

 veins. 2. The deep veins. 



The Superficial Veins are placed imme- 

 diately beneath the integument between the 

 two layers of superficial fascia ; they com- 

 mence in the hand chiefly on its dorsal 

 aspect, where they form a more or less com- 

 plete arch. 



The Deep Veins accompany the arteries, 

 and constitute the vena3 comites of those 

 vessels. 



Both sets of vessels are provided with 

 valves, which are more numerous in the deep 

 than in the superficial. 



1. The Siiperficial Veins of the Upper 

 Extremity are the 



Anterior ulnar. 

 Posterior ulnar. 

 Basilic. 

 Eadial. 



Cephalic. 

 Median. 

 Median basilic. 

 Median cephalic. 



The Anterior Ulnar Vein commences on 

 the anterior surface of the wrist and ulnar 

 side of the hand, and ascends along the 



