ORGAN OF SMELLING. 395 



quency of anastomosis continues, so that they form a net- work 

 of numerous and small meshes, which prevails from the cribri- 

 form plate to the inferior margin of the middle turbinated bone. 

 Their filaments cannot be traced below the latter line, and, 

 therefore, do not descend so low as the filaments of the inter- 

 nal row, neither are they so close to each other. They do not 

 penetrate to the ethmoidal cells. The posterior ones are very 

 abundant, on the upper turbinated bone, and incline backwards 

 in their descent; the anterior are also abundant on the flat an- 

 terior half of the ethmoid, and when they get below the line of 

 the upper meatus, they extend backwards to the posterior end 

 of the middle turbinated bone, and to its inferior margin. On 

 this bone they are less abundant than above it; their meshes are 

 larger, and their distribution is confined to the Schneiderian 

 membrane covering its convex surface. 



The filaments of the middle row associate themselves indis- 

 criminately with those of the external and of the internal row, 

 according to local convenience. 



The other nerves of the Pituitary Membrane come from the 

 first, and from the second branch of the Trigeminus. The first 

 branch of the latter gives off from its nasal branch the nerve 

 called Internal Nasal, which penetrates from the orbit into the 

 cavity of the cranium, through the anterior internal orbitary 

 foramen, and lies covered by the dura mater, at the side of the 

 crista galli; thence it passes into the cavity of the nose through 

 the most anterior foramen of the cribriform plate. 



This Internal Nasal Nerve (Nasalis Internus] having got into 

 the nose, divides into two fasciculi, an internal and an external. 

 The internal descends along the anterior margin of the septum, 

 between the mucous membrane and the bone, and, after a short 

 course, is divided into two filaments, one of which, applying it- 

 self to the posterior face of the os nasi, terminates by smaller 

 filaments in the integuments of the lower part of the nose; the 

 other filament continues along the margin of the septum to its 

 lower part, where it terminates by smaller filaments. The ex- 

 ternal fasciculus of the Nasalis Internus gives off early a fila- 

 ment, which descends along a groove on the posterior face of 



