. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. LUNGS 01? REPTILES. 521 soon after it has curved over the right puhiionary artery, sends oft the trunk of the vertebral and anterior intercostal arteries : in its origin aud position, this trunk resemljles the common brachial trunk in Lizards. The relation of the orio-iu of the ri<ilit aorta to the ventricular compartment, first receiving the arterialised blood from the pulmonary auricle, and the distribution of the branches of the right aorta, are such, that the head, neck, and fore-liinbs receive chiefly arterialise
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. LUNGS 01? REPTILES. 521 soon after it has curved over the right puhiionary artery, sends oft the trunk of the vertebral and anterior intercostal arteries : in its origin aud position, this trunk resemljles the common brachial trunk in Lizards. The relation of the orio-iu of the ri<ilit aorta to the ventricular compartment, first receiving the arterialised blood from the pulmonary auricle, and the distribution of the branches of the right aorta, are such, that the head, neck, and fore-liinbs receive chiefly arterialised blood, and the abdominal viscera, the trunk, hind-limbs, and tail, are supplied with mixed venous and arterial blood. But this localised distribution of the two kinds of blood^ is more completely effected in the Cro- -. -»? codiles, through the modification of the heart and arteries before described. § 92. Lungs of Reptik-s. — An opening on the midline of the ventral side of the pharynx, fig. .346, c, receives air introduced into the mouth, and conveys it to the receptacles which, in lleptiles and all higher Vertebrates, are called ' lungs,' ilj. f, f. Tlie opening, usually a short longi- tudinal slit, leads, in the Newt and Pro- teus, to a small crescentic membranous sac, from the angles of which are pro- duced the long slender pulmonic bags. In the Axolotl a short tube, strengthened by a few feeble subannular cartilages, con- ducts the air to the lungs, which com- mence just beyond the heart: in the Siren and Land-Salamander a similar trachea divides into two branches, one to each lung.' In all these tailed Batraclua the pulmonai'y bags have simple or even walls. The artery, formed as above described, from the hindmost vascular arch, joined by a branch from the next arch, runs along one side or border, and the vein returns along the opposite border of the lung. The branches proceed from the arterj', fig. .348, a, transversely, with regular intervals, midway in which the
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1860
