MINUTE ANATOMY OF NASAL MUCOUS MEMBRANE, 101 
whole poems a slight convexity towards the lumen of the organ. Compare 
Figs. 1 a 
The following are the measurements of the different diameters, 
taken at a point where the eartilaginous capsule is more or jess 
incomplete at the outer and lower part of the organ (see fig. 2). 
The short transverse diameter of the organ, exclusive 
of the cartilage or bone, is about . : 0°7 
The long transverse diameter of the organ, #. 2. ACTOSS 
the t upper and lower sulcus is about. Berl TPR 
The thickness of the lateral wall . ; ‘ : . 0°28 to 0°38 mm. 
median wall . ; 5 Orb 
The short transverse diameter of the cavity . 0:3 
The long transverse diameter, from the ne, to the lower 
sulcus . ‘ : : NW ae 
The thickness of the wall at the lower sulcus is about the 
same as that of the lateral wall, while that of the wall at the 
upper sulcus is slightly larger than that of the median wall. 
As regards the structure : 
1. The lateral wall. This consists of (a) the epithelium lining 
the cavity, (2) the subepithelial fibrous layer, (c) the layer of 
the cavernous tissue, (d) the layer of the glands. Outside these is 
the thin layer of fibrous tissue connecting the organ with the 
cartilage, or, where this is wanted, with the bone, and acting as 
the perichondrium or inner periosteum respectively. 
a. The epithelium is in all respects similar to that lining the 
mucous membrane of the nasal cavity, being composed of a super- 
ficial layer of columnar or conical cells, between the extremities of 
which extend spindle-shaped or inverted conical cells, z.e. cells 
whose basis is directed towards the depth. Hach of these cells pos- 
sesses an oval nucleus. The superficial conical cells show on their 
free surface a bundle of fine cilia. The whole thickness of the 
epithelium, inclusive of the cilia, is 0°064; the length of the cilia 
is 0:0054 mm. Loewe! failed to see the cilia of the epithelium 
of the lateral wall of the organ of Jacobson in the rabbit, but I 
presume this is entirely owing to the mode of preparing the 
specimens. Some of the superficial epithelial cells present them- 
selves as goblet cells. 
Leydig mentions’ that “ ciliated epithelium ” forms the boun-~ 
dary of the narrow lumen of the organ. 
Balogh® does not distinguish, in the sheep’s organ, the epithe- 
lium covering the lateral wall from that of the median wall, but 
speaks of it as a whole, and remarks that it is ciliated | 
epithelium. 
1 ¢ Beitr. zur Anatom. d. Nase und Mundhoble,’ Berlin, 1878. 
2 *Lehrbruch d. Histologie,’ p. 218. 
? Loc. cit., p. 458, 
