Page 180 - Veterinary Histology of Domestic Mammals and Birds, 5th Edition

162 Veterinary Histology of Domestic Mammals and Birds

VetBooks.ir Dura mater

Epiphysis
Cerebellum

Cisterna
cerebellomedullaris
Medulla oblongata Optic nerve (II)

Spinal cord Neurohypophysis
Adenohypophysis

9.1 Paramedian section of the basal region of the brain showing the position of the hypophysis and epiphysis
(calf) (König and Liebich, 2009).

9.2 Hypothalamo-hypophyseal system (schematic).

the neurohypophysis for storage and release according neurohypophysis. Accumulations of granules are visible
to demand. These hormones act directly upon peripheral with the light microscope (Herring bodies). Within the
organs. neurohypophysis, the granules are stored within the bul-
bous axon terminals. Upon membrane depolarisation, they
Hypothalamus are released by exocytosis into the fenestrated capillary
The neurons of the supraoptic and paraventricular nuclei network.
(nucleus supraopticus, nucleus paraventricularis) syn- Neurons of the ventromedial and infundibular (arcu-
thesise the effector hormones oxytocin and vasopressin. ate) nuclei (nucleus ventromedialis, nucleus infundibularis)
Within the perikarya, the hormones are packaged in synthesise regulatory hormones (RH, IH) that are distrib-
membrane-bound secretory granules. These neurosecre- uted by the hypothalamo-hypophyseal portal system to the
tory granules are transported through the axons into the adenohypophysis.

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