136 ELEMENTS OF MAMMALIAN ANATOMY. 
branches to form the carotid plexus, a palatine, sphenopala- 
tine, and infraorbital. The latter is the direct continuation 
of the internal maxillary. It supplies the upper teeth, lower 
eyelid, parts of the nose, and upper lip. An ophthalmic 
branch, supplying structures in the orbit, may arise from 
the carotid plexus or the internal maxillary. 
ral 
verted 
Carolia 
Fic. 73. VENTRAL ASPECT OF THE ARTERIES OF THE Heap AND NECK. 
The carotids with their branches have been drawn laterad. 
a, Internal maxillary; ac, anterior cerebellar; ce, median cerebral; cr, 
posterior cerebral; cp, posterior cerebellar; cx, carotid plexus, many 
of whose branches reunite in one, cx’, which is cut off; ex, external 
carotid; em, external maxillary ; inc, origin of internal carotid; inc’, 
union of internal carotid with circle of Willis; ia, inferior alveolar; 
if, infraorbital; 7, optic chiasma; Ii, lingual; mm, middle meningeal ; 
ms, muscular; oc, occipital; ol, anterior cerebral; pl, palatine; pa, 
posterior auricular; s, anterior spinal; th, thyroid; +, hypophysis; 
I, 2, 3, 4, 5, and 6, transverse foramina in cervical vertebra. 
