46 DISSECTION OF THE CAT 



the cheek, lips, muscles of the mandible, and to 

 the submaxillary gland. 



(5) The Post-auricular Artery, which is distributed 

 to the posterior side of the ear. 



(6) The Temporal Artery, which is distributed to 

 the parotid gland and muscles of the side of the 

 head. 



After giving off the temporal branch, the caro- 

 tid passes beneath the masseter muscle and ends in 

 a plexus of small blood-vessels near the glenoid 

 fossa. 



b. The Right Subclavian Artery. After giving off 

 the two carotid arteries, the remaining portion of 

 the brachio-cephalic is known as the right sub- 

 clavian artery. It gives off the following branches : 



(i) The Vertebral Artery, which pierces the trans- 

 verse processes of the six anterior cervical verte- 

 bras, enters the foramen magnum, and unites with 

 its fellow of the opposite side to form the basilar 

 artery of the brain. 



(2) The Superior Intercostal Artery, arising a little 

 beyond the vertebral artery, is distributed to the 

 intercostal muscles between the four anterior ribs. 



(3) The Sternal or Internal Mammary Artery, given 

 off just beyond the last, runs posteriorly along the 

 inner surface of the sternum. 



(4) The Thyroid Axis arises directly opposite the 

 sternal artery, and passes anteriorly and dorsally. 

 It supplies the suprascapular region, and gives off 

 a branch to the thyroid gland. 



