THE ARTERIES. 



227 



(Fig-. 147 v) courses backwards lying" on the transverse processes of 

 the vertebrae and on the M3I. iuterfransversarn, under cover of the 

 31. longissuinii^ dor-si. In this course it is close to the oblique pro- 

 Fig. 147. 



Dissection to show the oocipito-vertebr;il and the cutaneous arteries. 

 The skin of tlie back has been divided by a median incision and drawn to either side ; the right arm 

 dislocated and removed througli tlie opening in the skin (at A). On the left side the extensor 

 muscles of the back have been removed. 



cm. Cutaneous artery. 



c.p. Arteria cutanea pectoris. 



o Occipital artery. 



*■ Scapular artery. 



V Vertebral artery. 



cesses, and may even be partially covered by these ; it extends 

 beyond the sacrum, and g-ives off : — 



a. The Bami sjnnales, which pass through the intervertebral 

 foramina to the spinal cord (see Arteries of Spinal Cord, p. 162). 



ji. The Rami dorsales ; these supply the muscles of the back and 

 send branches to the skin, which accompany the cutaneous branches 

 of the spinal nerves through the Saccns li/mph aliens cranio-dorsalis. 



Q 7, 



