. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. 264 THE CAT. [CHAP. conical process, the infundibulum. At the end of the infundibulum is a small oval reddish mass called the pituitary body, which is received into the pituitary fossa (or sella turcica) of the sphenoid bone. Between the diverging crura and the corpus albicans, is a depressed surface of greyish matter perforated by numerous small vascular openings, whence it is termed the locus perforatum posterior. The tuber cinereum is a lamina of grey nervous matter extending
. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. 264 THE CAT. [CHAP. conical process, the infundibulum. At the end of the infundibulum is a small oval reddish mass called the pituitary body, which is received into the pituitary fossa (or sella turcica) of the sphenoid bone. Between the diverging crura and the corpus albicans, is a depressed surface of greyish matter perforated by numerous small vascular openings, whence it is termed the locus perforatum posterior. The tuber cinereum is a lamina of grey nervous matter extending forwards from the corpus albicans to the median junction of the optic tracts, or optic commissure. The pituitary body is very vascular, and in structure is like a ductless gland, consisting as it does of connective tissue with granular matter and nu- cleated cells. Another grey space with vascular openings—called the, locus perforatum anterior — is placed on each side just in front of each optic tract. Anterior to and beside these small median parts are those voluminous masses the cerebral hemispheres, which thus form a very large part of even the under surface of the brain. The great longitudinal fissure is seen m the middle line in front, and another but small (Figs 125) lateral fissure (called the Sylvian fissure) separates the anterior (or frontal) lobe from the one behind (or temporal lobe) of the same hemisphere. The temporal lobes form two great prominences on each side of the brain's under surface. Each is bounded behind by the cerebellum, and is well marked off in front by the Sylvian fissure. In a groove on the under surface of each frontal lobe is a body, shaped something like a life-preserver, with an oblong head and a thick stalk. This is the olfactory lobe or bulb. It is made up largely of grey matter, but also contains white fibres. The stalks Fig. 128.—Base of the Brain. F. Frontal lobe. T. Temporal lobe. ol. Olfactory lobe. m. Medulla oblongata. cb. Cereb
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectanatomy, bookyear1881
