504 



BLOOD-VESSELS OF THE NECK. 



crico-thyroid membrane, and entering into the interior 

 of the thyroid gland, and anastomosing freely with the 

 inferior thyroid. 



The facial artery, called also the labial, or external max- 

 illary, arises also from the front of the external carotid, 

 opposite the os-hyoides, and ascends to the lower jaw 

 behind, and in the substance of the submaxillary gland. 

 Thence it proceeds to the angle of the mouth, and thence 

 by the side of the nose, to the angle of the eye, where it 

 terminates by anastomosing with the ophthalmic. Its 

 branches supplying any portion of the neck, are chiefly the 

 glandular, distributed to the submaxillary and lymphatic 

 glands, and the submental, which leaves the facial just as 

 it is mounting over the lower jaw, and proceeds forward, 

 covered by this bone, passing over the anterior belly of the 

 digastricus, and beneath the origin of the mylo-hyoideus 

 to the chin, which, with the adjacent muscles, it supplies, 

 and ends by anastomosing with the inferior dental and 

 eublingual branches. 



The occipital arises opposite the facial, from the posterior 

 part of the external carotid, and ascends backward behind 

 the posterior belly of the digastric, the sterno-mastoid, and 

 trachelo-mastoid muscles, to the groove at the root of the 

 mastoid portion of the temporal bone. It now proceeds 

 horizontally backward, between the splenius and complexus 

 muscles, to the mesial line of the atlas, and thence ascends 

 upon the occiput, terminating in numerous branches which 

 anastomose with its fellow, the posterior auricular, and 

 the temporal arteries. Its cervical branches supply the 

 superficial and deep muscles on the posterior and superior 

 part of the neck. The arteria princeps cervicis is the name 

 applied to the deep branch which descends to the com- 

 plexus and semi-spinalis muscles, and anastomoses with 

 the profunda cervicis of the subclavian, thus forming the 

 collateral circulation between the branches of the external 

 carotid and subclavian arteries. 



The subclavian artery, (Figs. 120, 153 5 ) on the right side, 

 arises from the arteria innominata, opposite the sterno-cla- 



