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Encyclopedia > Pars intermedia

Pars intermedia is the boundary between the anterior and posterior lobes of the pituitary. Adult humans do not possess a pars intermedia, and instead it becomes a residual cleft composed of Rathke's cysts. Located at the base of the skull, the pituitary gland is protected by a bony structure called the sella turcica. ...


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XI. Splanchnology. 4d. The Hypophysis Cerebri. Gray, Henry. 1918. Anatomy of the Human Body. (810 words)
The pars anterior is extremely vascular and consists of epithelial cells of varying size and shape, arranged in cord-like trabeculæ or alveoli and separated by large, thin-walled bloodvessels.
The pars intermedia is a thin lamina closely applied to the body and neck of the posterior lobe and extending onto the neighboring parts of the brain; it contains few bloodvessels and consists of finely granular cells between which are small masses of colloid material.
The pars intermedia in spite of the fact that it arises in common with the pars anterior from the ectoderm of the primitive buccal cavity is often considered as a part of the posterior lobe which arises from the floor of the third ventricle of the brain.
Pars pro toto - definition of Pars pro toto in Encyclopedia (112 words)
Pars pro toto is Latin for synecdoche, or "(taking) a part for the whole".
When used in a context of language it means that something is named after a part of it (or after a limited characteristic, in itself not necessarily representative for the whole).
"glasses" is a "pars pro toto" name for a complicated structure to put on a human's nose, and implying also other materials than simply two pieces of glass.
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