ANGIOLOGY 





The Ethmoidal Arteries are two in number: posterior and anterior. The posterior 

 ethmoidal artery, the smaller, passes through the posterior ethmoidal canal, supplies 

 the posterior ethmoidal cells, and, entering the cranium, gives off a meningeal 

 branch to the dura mater, and nasal branches which descend into the nasal cavity 

 through apertures in the cribriform plate, anastomosing with branches of the 

 sphenopalatine. The anterior ethmoidal artery accompanies the nasociliary nerve 

 through the anterior ethmoidal canal, supplies the anterior and middle ethmoidal 

 cells and frontal sinus, and, entering the cranium, gives off a meningeal branch 

 to the dura mater, and nasal branches; these latter descend into the nasal cavity 

 through the slit by the side of the crista galli, and, running along the groove on 

 the inner surface of the nasal bone, supply branches to the lateral wall and septum 

 of the nose, and a terminal branch which appears on the dorsum of the nose between 

 the nasal bone and the lateral cartilage. 



6'... 



FIG. 515. Bloodvessels of the eyelids, front view. 1, supraorbital artery and vein; 2, nasal artery; 3, angular artery, 

 the terminal branch of 4, the facial artery; 5, suborbital artery; 6, anterior branch of the superficial temporal artery; 

 6', malar branch of the transverse artery of the face; 7, lacrimal artery; 8, superior palpebral artery with 8', its external 

 arch; 9, anastomoses of the superior palpebral with the superficial temporal and lacrimal; 10, inferior palpebral artery; 

 11, facial vein; 12, angular vein; 13, branch of the superficial temporal vein. (Testut.) 



The Medial Palpebral Arteries (aa. palpebrales mediates; internal palpebral 

 arteries), two in number, superior and inferior, arise from the ophthalmic, opposite 

 the pulley of the Obliquus superior; they leave the orbit to encircle the eyelids 

 near their free margins, forming a superior and an inferior arch, which lie between 

 the Orbicularis oculi and the tarsi. The superior palpebral anastomoses, at the 

 lateral angle of the orbit, with the zygomaticoorbital branch of the temporal artery 

 and with the upper of the two lateral palpebral branches from the lacrimal artery; 

 the inferior palpebral anastomoses, at the lateral angle of the orbit, with the lower 

 of the two lateral palpebral branches from the lacrimal and with the transverse 

 facial artery, and, at the medial part of the lid, with a branch from the angular 

 artery. From this last anastomoses a branch passes to the nasolacrimal duct, 

 ramifying in its mucous membrane, as far as the inferior meatus of the nasal 

 cavity. 



The Frontal Artery (a. frontalis), one of the terminal branches of the ophthalmic, 

 leaves the orbit at its medial angle with the supratrochlear nerve, and, ascending 



