Henry L. Bruner 13 
vestibule. The spongy tissue begins at the external nasal opening and 
extends through the entire length of the vestibule. The blood-spaces are 
fed, in part at least, by small arteries from the a. medialis nasi, which 
runs along the median wall of the nasal vestibule in company with the 
ramus medialis nasi ophthalmicus V and the vena medialis nasi. 
The sinus vestibuli nasi is drained by two or three short veins which 
run directly laterad from the posterior part of the sinus. These veins 
discharge into the sinus lateralis nasi, which in turn is drained by the 
vena maxillaris and the vena lateralis nasi, as already described. 
The literature dealing with the sinus vestibuli nasi is referred to on 
page 70; the function of the spongy tissue is described later. 
(2) Vena Labialis Superior (v. 1. s., Text Fig. 2).—The vena labialis 
superior begins in the vena rostralis immediately ventral to the origin 
of the vena maxillaris. Behind their origin the two veins separate, 
the labial vein running close to the inner epithelium of the lip 
(v. 1. s., Figs. 2-and 3, Plate II), while the vena maxillaris takes the 
more dorsal course already described. In its passage caudalward the 
labial vein receives small tributaries from the skin and deeper parts; it 
is also connected by several anastomoses with the vena maxillaris. Near 
its posterior end the labial vein communicates with the sinus palatinus 
by three or four transverse veins (c. /., Text Fig. 2) which run through 
the submucosa posterior to the teeth. One of these veins passes below the 
posterior end of the maxillary bone, one or two near the maxillo-jugal 
suture, and another under the anterior part of the jugal bone. 
At the angle of the mouth the vena labialis superior bends dorsad 
and discharges into the vena maxillaris. Near its termination it re- 
ceives a small vena jugalis, which drains a fold extending backward from 
the angle of the mouth. The fold contains a process of the jugal bone. 
2. VENA NASALIS DORSALIS (v. n. d., Text Fig. 2).—The vena nasalis 
dorsalis arises in the skin which covers the nasal bones. Anterior to the 
fronto-nasal suture it passes through the nasal bone and runs backward, 
first between the bones and the cartilaginous roof of the nasal capsule, 
then through the lateral portion of the fenestra olfactoria, where the vein 
hes in the cranial wall close to the roof cartilage. Continuing caudad the 
vein passes under the cartilago sphen-ethmoidea, which it follows to the 
fissura orbito-nasalis, through which the vein discharges into the sinus 
orbitals. The vena nasalis dorsalis has the following tributaries: 
(1) Vena Turbinalis Superior (v. t. s., Text Fig. 2).—This vein drains 
the dorsal part of the concha and leaves the nasal cavity through the 
posterior part of the fenestra lateralis nasi of Gaupp, oo. Outside of 
