A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . cellular lining atrophies, andtheir contents undergo colloiddegeneration. When thegland vesicles are greatlyenlarged, goitre is pro-duced. The Chemical Composi-tion of this gland has notbeen much investigated. Inaddition to the ordinary con-stituents, leucin, xanthin,sarkin, lactic, succinic, andvolatile fatty acids have beenfound. Functions.—Its functions are quite unknown. Perhaps it may be an apparatusfor regulating the blood supply to the head (?).
A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . cellular lining atrophies, andtheir contents undergo colloiddegeneration. When thegland vesicles are greatlyenlarged, goitre is pro-duced. The Chemical Composi-tion of this gland has notbeen much investigated. Inaddition to the ordinary con-stituents, leucin, xanthin,sarkin, lactic, succinic, andvolatile fatty acids have beenfound. Functions.—Its functions are quite unknown. Perhaps it may be an apparatusfor regulating the blood supply to the head (?). It becomes enlarged in Basedowsdisease, in which there is great palpitation, as well as protrusion of the eyeball[Exophthalmos], which seem to depend upon a simultaneous stimulation of theaccelerating nerve of the heart, and the sympathetic fibres for the smooth musclesin the orbital cavity and the eyelids, as well as of the inhibitory fibres of thevessels of the thyroid. In many localities it is common to find swelling of thethyroid constituting goitre, which is sometimes, but far from invariably, associatedwith idiocy and Fig. 94. Section of the thyroid gland ( x 250)—or, smallclosed vesicles lined by low columnar epithe-lium ; 6, colloid masses distending the vesicles;c, connective tissue between the vesicles. IV, The Supra-Renal Capsules. Structure.—These organs are invested by a thin capsule which sends processesinto the interior of the organ. They consist of an outer (broad) or cortical layerand an inner (narrow) or medullary layer. The former is yellowish in colour, firmand striated, while the latter is softer and deeper in tint. In the outermost zoneof the cortex (Fig. 953 b), the trabeculte form polygonal meshes which contain the 214 THE SUPRA-RENAL CAPSULES. cells of the gland substance ; in the broader middle zone, the meshes are elongatedand the cells filling them are arranged in columns radiating outwards. Here thecells are transparent and nuclea
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
