. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Base of brain of Echidna, ( Original.) lobes, forming the base of the enormous olfactory nerves. The natiform protuberances are unusually large. The medulla oblongata is broad and flat, but contracted anteriorly to an angle; the pyramidal bodies (a) long and narrow; the olivary bodies (b) broad, but flat. The pons Varolii (c) presents, as in the Orni- thorhynchus, a low development proportion- ally to the size of the brain : it is not raised beyond the level of the under surface of the medulla oblongata: it is of a trian
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Base of brain of Echidna, ( Original.) lobes, forming the base of the enormous olfactory nerves. The natiform protuberances are unusually large. The medulla oblongata is broad and flat, but contracted anteriorly to an angle; the pyramidal bodies (a) long and narrow; the olivary bodies (b) broad, but flat. The pons Varolii (c) presents, as in the Orni- thorhynchus, a low development proportion- ally to the size of the brain : it is not raised beyond the level of the under surface of the medulla oblongata: it is of a triangular form with the obtuse apex turned forwards: the median longitudinal groove formed by the ba- silar artery is well marked : the trapezoid bodies are relatively narrower than in the Ornitho- rhynchus. The pituitary gland (p, Jig. 183) is one line and a half in length and one line in breadth : its under surface adheres closely to the dura mater of the sella turcica. The corpus mam- Fig. millare is single, broad, and but little ele- vated. The internal, superior, and posterior walls of the lateral ventricle are from one line to two lines in thickness ; the outer wall is between two and three lines; when the roof of the ventricle is removed, as in Jig. 184, two elongated convex bodies are exposed, as in the marsupial brain: the posterior and largest (A) is the hip- pocampus major: the anterior body (s) is the corpus striatum. The whole internal wall of one ventricle is quite disunited from that of the opposite hemisphere.* The contracted an- terior parts of the hip- pocampi are connected together by the short transverse commissure above mentioned, which is the sole re- presentative of the cor- pus callosum and for- nix. The septum luci- Right lateral ventricle laid dum and fifth ventricle °PfOrSST' are entirely absent. The pia mater, which accompanies the ven- tricular artery into the floor of the ventricle, at the base of the hippocampus, spreads over the optic thalami
Size: 1302px × 1920px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
