THE NERVES. 385 



ferior angle. From its anterior border two small fasciculi 

 pass off the 



Nervi ciliares. They pass along in a tortuous manner 

 with artt. ciliares, anastomosing with one another ; they 

 perforate the sclerotica around the n. opticus, pass evenly 

 between this and the choroidea to the ciliary ligament, and 

 some, thence, to the iris, where they divide ; others pass 

 immediately to the retina. The superior fasciculus has 

 four, the inferior five to six filaments. 



b. N. ethmoidalis passes immediately through forar/i. ethmoidak 

 anterius from the orbit into the cranial cavity, passes from be- 

 hind forwards upon the superior surface of the cribriform plate 

 of the ethmoid bone near the arista galli, and sinks into the 

 nasal cavity through an anterior foramen, where it divides into 

 an internal and external branch. 



1. Ramus internet, s. septi mobilis, upon the mucous mem- 

 brane of the anterior part of the septum. 



2. Ramus externus gives a branch to the conch se and anterior 

 part of the septum ; passes into the sulcus of the nasal bone, 

 and comes forth between the bones and cartilage, and rami- 

 fies upon the skin of the ala nasi as far as the point where 

 it anastomoses with n.facialis. 



c. N. infratrochkaris passes on under m. obliquus superior with 

 art. ophthalmica, escapes from the orbit beneath the trochka, 

 and divides into : 



1. External branches, which perforate the m. orbicularis, and 

 at the free border of the superior lid anastomose in loops, 

 supplying the lacrymal sac and caruncle. 



2. Internal branches, which anastomose upon the root of the 

 nose with branches of n.facialis. 



3. Superior branches, which pass to the forehead, and anasto- 

 mose with n. supra-trochkaris. 



3. N. lacrymalis, the smallest branch of ophthalmicus, passes 

 along the superior border of m. rectus externus on the outer wall 

 of the orbita, with art. lacrymalis, and divides into an external and 

 internal branch. 



1. Ramus externus s. nerv. zygomaiicus passes through the 

 malar bone, uniting with n.facialis on the cheek. 



2. Ram. internus passes through the lacrymal gland, ramifies 

 in it, then perforates the upper lid with a branch which 

 reaches as far as the tarsus^ and 'with another which is lost 

 in the skin of the anterior temporal region. 



25 



