. The endocrine organs; an introduction to the study of internal secretion . t its fibres. The sharp edge of the pars intermedia onthe left forms part of the boundary of the intraglandular cleft; the free edge on theright of the pars nervosa is part of the boundary of the extension of the third ventricleinto the gland. in the cerebro-spinal fluid; a fact which makes it evident thatthey must normally be passed to some degree into that fluid. The Iryalme Structure of the Pituitary 83 globules are greatly increased as the result of thyroidectomy (Herring).Gushing states that this incre
. The endocrine organs; an introduction to the study of internal secretion . t its fibres. The sharp edge of the pars intermedia onthe left forms part of the boundary of the intraglandular cleft; the free edge on theright of the pars nervosa is part of the boundary of the extension of the third ventricleinto the gland. in the cerebro-spinal fluid; a fact which makes it evident thatthey must normally be passed to some degree into that fluid. The Iryalme Structure of the Pituitary 83 globules are greatly increased as the result of thyroidectomy (Herring).Gushing states that this increase also results from extirpating thepancreas, and that it occurs as the result of section of the infundi-bular stalk. Pars nervosa (also known as the neuro-hypophysis or infundibularbody). — This is formed almost entirely of neuroglia fibres with neurogliacells scattered amongst them. Many of the fibres arise from these cells,others from the ependyma cells of the infundibulmn and of its extensioninto the gland. Between the neuroglia fibres, especially in the neighbour-. FIG. 55.—Section of posterior lobe of pituitary of cat, including a portion of the centralcavity which is continuous with the infundibulum of the third ventricle. (Herring.) a, ependyma of central cavity; b, colloid or hyaline matter in central cavity: some of it is seen passingthrough the ependyma of the pars nervosa ; c, ependyma fibres ; d, hyaline masses; e, a granularmass in pars nervosa. hood of the stalk, but also in other situations, is to be seen the hyaline andgranular matter already referred to ; sometimes in the form of swollencells such as have been described in connexion with the pars inter-media, sometimes as amorphous masses; these masses are traceable, asalready mentioned, to the infundibulum, where they may be seen passingthrough the ependyma into the cavity of the ventricle (fig. 55). There canbe little doubt that the physiological activity of extracts of the pars nervosais connected with
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