What is found in the pars nervosa?

What is found in the pars nervosa?

The bulk of the pars nervosa consists of axons from neurons in the supraoptic and paraventricular nuclei of the hypothalamus. A few Herring Bodies are present. These are the storage sites of the neurosecretory material of the pars nervosa neurons. The Herring Bodies contain many greyish-brown storage vesicles.

What is the histology of pituitary gland?

The pituitary gland, is a small gland with a diameter of approximately 1 cm. It sits within a saddle-shaped bony cavity called the sella turcica, at the base of the brain. The gland is divided into two main parts, the anterior pituitary or adenohypophysis; and the posterior pituitary or neurohypophysis.

Is pars nervosa part of neurohypophysis?

The neurohypophysis is smaller and includes the posterior lobe or pars nervosa, and the pituitary stalk or infundibulum, which forms a contiguous unit from the posterior lobe to the hypothalamus (Fig. 1).

What is the function of pars Distalis?

The pars distalis (called pars anterior in the horse) consists of cells that produce, store, and release trophic hormones in response to specific releasing hormones or inhibitory factors from the hypothalamus (see Fig.

What is the histology of thyroid gland?

Histologically, the thyroid gland is organized as epithelial cells surrounding colloid-containing pools, called follicles. The colloid is rich in thyroglobulin, a protein possessing many tyrosine residues to which iodine molecules attach to form the thyroid hormones.

What is pars Distalis?

Pars distalis: This is the portion in which the majority of the hormone production occurs. It is the distal part of the pituitary and forms the majority adenohypophysis. The main hormone secreted by this portion of the adenohypophysis is MSH, otherwise known as the melanocyte-stimulating hormone.

What hormone is released from the hypothalamus?

The hormones produced in the hypothalamus are corticotrophin-releasing hormone, dopamine, growth hormone-releasing hormone, somatostatin, gonadotrophin-releasing hormone and thyrotrophin-releasing hormone.

What kind of cells are in the pars nervosa?

Pituicytes are astrocyte-like cells in the pars nervosa and infundibulum. Pituicytes support the tissue and associate with the Herring bodies. Pituicytes are astrocyte-like cells in the pars nervosa and infundibulum. Pituicytes support the tissue and associate with the Herring bodies.

How many images are in the histology Atlas?

View over 900 high resolution images of histological structures accompanied by interactive descriptive text that labels relevant histological details of every cell and tissue in the human body. This award-winning histology atlas is divided into “Human Cells & Basic Tissues” then “Human Organ Systems”.

Where does the pars intermedia come from in a rat?

The pars intermedia arises from a portion of the wall of the Rathke’s pouch, which initially is in close proximity to the brain vesicle. Rathke’s cleft is a remnant of Rathke’s pouch that persists in the adult rat as a cleft or potential space between the pars intermedia and pars distalis.

Where does the pars distalis and pars tuberalis come from?

The pars distalis and pars tuberalis originate from the anterior wall of the Rathke’s pouch; the pars tuberalis comes to form a sleeve-like covering of the infundibular stalk. The pars intermedia arises from a portion of the wall of the Rathke’s pouch, which initially is in close proximity to the brain vesicle.