Block9/Fig. 8, 93W6616, Pineal body, HE

block11_17.jpg - Fig. 8 & 9, NK-2-c, k-2-a Pituitary Gland, posterior lobe, HEThe posterior lobe seen here contains the nuclei inside the cells called pituicytes, and unmyelinated nerve fibers extended from the nuclei of the hypothalamus. The pituicytes are comparable with neuroglial cells of the central nervous system. The nuclei are round to oval. In H&E preparations such as this, the cytoplasm of the pituicyte cannot be distinguished from the unmyelinated nerve fibers. The hormones of the posterior lobe are formed in the hypothalamic soma and pass via the nerve fibers to the posterior lobe, where they are stored in the expanded nerve terminal portion of the nerve fibers. The stored neurosecretory material appears as Herring bodies. In H&E preparations, the Herring bodies simply appear as small islands of eosin-stained substance.

Fig. 8, 93W6616, Pineal body, HE This micrograph shows at higher magnification of parenchyma of the pineal gland. Within the gland at the light microscopic level there are two specific cell types. One cell type represents the pinealocytes are by far the most numerous. Pinealocytes are modified neurons. Their nuclei are spherical and are relatively lightly stained because of the amount of euchromatin that they contain. The second cell type is the interstitial cell or glial cell that constitutes a relatively small percentage of the cells in the gland. Their nuclei are smaller and more elongate than those of the pinealocytes.

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