ClRCLILATOllY SVSTIiM. 19.3 



lachrymal gland, eyelids, and ductus ad uasuni. One in parti- 

 cular, larger than the others, named the lateral nasal branch, 

 enters the cavity of the cranium through the (bramen orbitale in- 

 ternum, and after forming a communication there with the anterior 

 cerebral artery, turns round and enters the nose through the eth- 

 moidal cells to be dispersed upon the Schneiderian membrane. 



f. The injra-orbitar, a considerable branch entering the infra- 

 orbitar canal, in order to supply the anterior molar teeth and 

 medullary substance of the bone with blood : having served this 

 purpose, it sends its remaining twigs out upon the cheek, through 

 the maxillary hole there, whereupon they anastomose with tlie 

 ramifications of the facial artery. 



g. Thepalato-maxillari/, the largest of the terminating divisions 

 of the inferior maxillary artery, enters the foramen palatinum su- 

 per! us, descends through the palatine canal, re-appears upon the 

 roof of the palate, and follows the tract of the palatine groove, 

 some short distance removed from the sides of the molar teeth, 

 out of which, inferiorly, it makes a curve inward, just above the 

 roots of the front teeth, to take its passage through the foramen 

 incisivurn, to reach the front of the jaw, there to join its fellow. 

 From this remarkable arterial union issue several branches, some 

 of which run down to supply the glandular structure of the upper 

 lip, while others are directed upward upon the external nares : the 

 peeper-seated ones penetrate the dilatator narium and depressor 

 labii superioris; and many of them anastomose with the termi- 

 nating ramifications of the superior labial artery. This vessel 

 gives off some few branches to parts at the back of the orbit, 

 before it enters the foramen ; and other short twigs, as it courses 

 the palate. — Sportsmen and farriers have a practice of cutting- 

 through the bars and severing the palato-maxillary, in order to 

 detract blood on any occasion of emergency : the artery however 

 seldom bleeds much — it soon retracts into its cellular case, and 

 forms a coagulum ; and this renders the operation, in a general 

 way, both ineffectual and harmless. 



The second and smallest division of the carotid, is the 



Ramus Anastomoticus. 



It leaves the trunk of the carotid, commonly at the angle 

 formed by the external and internal carotids, crossing the latter 

 in proceeding to the spine. Deeply seated beneath the parotid 

 gland, in its course it describes an arc backward, which, in the 

 ordinary position of the head, nearly corresponds to the under 

 border of the stylo-maxillaris. From below the coronoid process, 

 it turns under the transverse process of the atlas, vvhi re it joins 



