Human anatomy, including structure and development and practical considerations . iaphragmasellce, through an opening in which the infundibulum passes to the mushroom-shapedorgan. The pituitary body consists of two distinct parts, of which the so-calledanterior lobe is much the larger and of a darker grayish red color. Its posteriorsurface is conca\e and recei\es the small posterior lobe, which is partially embracedat the sides by the lateral margins of the anterior division. Although thetwo lobes are closely bound together by connective tissue, they are not only distinctas to struct
Human anatomy, including structure and development and practical considerations . iaphragmasellce, through an opening in which the infundibulum passes to the mushroom-shapedorgan. The pituitary body consists of two distinct parts, of which the so-calledanterior lobe is much the larger and of a darker grayish red color. Its posteriorsurface is conca\e and recei\es the small posterior lobe, which is partially embracedat the sides by the lateral margins of the anterior division. Although thetwo lobes are closely bound together by connective tissue, they are not only distinctas to structure and probably function, but are developed from entirely differentregions. The anterior lobe is formed as an outgrowth from the oral diverticulum,while the posterior lobe tirst appears as a ventral evagination from the diencejjhalon( Fig, 1530). The anterior lobe, glandular in character, has been described in con-nection with the Accessory Organs <jf Nutrition (page 1806; and, therefore, callsfor no further consideration in this place. Fig. 977. Posterior or cerebral lobe. ?r*—Blood-vessel ?l .ritenor ororal lobe Connective-tissue^-^ ;\. - : . trabecula y -i ?- . ^ Capsule Transverse section of pituitar>-bu.^>, ^.^ .^.. i. ?,.. .li.^ , j?tt;.iu ^cerebral) lobes. X 7. The posterior lobe of the pituitary body is lighter in color and softer in con-sistence and directly attached to the floor of the third ventricle by means of its stalk,the infundibulum. During the early stages of its development, this lobe is repre-sented by a tubular outgrowth whose walls partake of the general character of theadjacent brain-visicle. Later the lumen within the lower end of the diverticulum dis-appears in consequence of thickening and of its walls, a funnel-shapedrecess of variable depth within the infundibulum alone remaining. In the adult con-dition, the posterior or cerebral lobe retains few histological features suggesting itsnervous origin.
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
