OCR Text |
Show 3 2 2 MR. R. H. BURNE ON THE [A p r . IB , cava inferior. The vena cava lies to the right of the aorta, and enters the deep surface of the right lobe of the liver. Just before leaving the anterior border of the liver, it receives a large hepatic vein. Two trunks of the hepatic portal system were noted, one coming from the stomach and entering the liver at the anterior end of its left lobe, the other from the first part of the intestine opening into the lower border of the same lobe. The Thyroid Body. The thyroid body has the normal position between the roots of the carotid arteries; it is supplied with blood by branches of the subclavians. O rgans of R e sp ir a t io n . The Larynx.-The larynx closely resembles that of Chelone. The procricoid cartilage is not, however, a completely separate nodule, but forms a process of the anterior dorsal border of the cric-o-thyroid. The first complete tracheal ring lies 7 cm. behind the anterior margin of the crico-thyroid cartilage. In front of it, included within the crico-thyroid cartilage, there are six imperfect or slightly indicated rings. These, as usual, are more marked and extend further forward on the ventral surface than on the dorsal. The constrictor and dilator laryngis muscles are quite normal. The Trachea.-The lower end of the trachea is divided into two lateral channels by a dorso-ventral partition for a distance of 11 '5 cm. upwards from the bifurcation of the bronchi. This has been accurately described by Rathke (Muller's Arch. 1846, p. 292). In this part of the trachea the rings tend to be somewhat irregular and frequently show partial duplication. R e n a l O rg an s. The kidneys are large and flattened dorso-ventrally. Each measures 23 cm. in length by 11 cm. in breadth at the hinder end, and 6 cm. at the anterior end. Like the kidneys of other Reptiles they are much lobulated, tlie lobes having roughly the form of irregular transverse bands, which are themselves further subdivided by close convolutions. The ureters emerge from the hinder part of the ventral surface of each kidney between the main trunks of the afferent and efferent renal veins, and from this point run directly backwards to the lateral walls of the uro-genital sinus, into which they open upon a pair of prominent papilla-. The walls of the ureters are thick and pigmented. |