| OCR Text |
Show 478 DR. J. MURIE ON SAIGA TARTARICA. [June 9, where. In the young female the sac and its opening similarly placed (see fig. 8, M S) were smaller than in the adult male; but I shall choose the latter for description. It is placed deeply beneath the nasal muscles and tissues, above the premaxillary bone, and vertically under the alar cartilage. It is globular in shape, an inch deep, and with a large vertical ellipsoidal aperture opening into the nasal passage below the anterior inferior margin of the alar cartilage. interiorly it is lined with an extension of the mucous membrane, and is studded with glands similarly to the hairy portion of the nares. The glands secrete abundantly a sebaceous-looking substance which Pallas says has a rancid goat-like odour; and in this I concur, though in Sheep the smell from the nares is not dissimilar. The inferior turbinal bones and mucous lining narrow the nostril behind the opening of the sac ; but it is worthy of notice that a small vertically semilunar depression, \ an inch long, exists between them outside the turbinal and superior to the orifice of the sac. There is also another much wider fossa or duplication of membrane on the floor of the chamber mesially and in front of the first-mentioned premaxillary sac. In fact, a semilunar membranous fold forms a well-defined step between the raised anterior narial chamber and deeper posterior nares. The soft membranous postseptum is very thick compared with the front part; its vessels are arranged in very numerous obliquely parallel lines. Fig. 8. Dissection, head of female Saiga, showing nasal sac and nervous distribution. MS. Maxillary sinus, or extra nasal sac; a portion of its outer wall is removed, and an arrow from the nares shows the connexion therewith; parts of two other arrows indicate the separate nasal passages. /. Suborbital fossa or pit. Na. m. Nasal muscles, reflected and partially cut off. z. Origin and insertion of zygomaticus. I.o.n. Infraorbital nerves. F.n.cfa. Facial nerve and artery, a dotted line carrying them towards their cranial exit. P. gt. Parotid gland ; and Ot. s. Glandula socia. F.v. Facial vein. St. d. Stenou's duct. Ma1 and Ma2. Superficial and deep layers of the masseter. Te. Temporalis. |
