9.2 POJA-L2762+2764+2781+2783+4384+La0216
Title: Pars nervosa, pars distalis and pars intermedia of the human hypophysis (II)
Description:
(A, B): Scheme and survey of hypophysis, stain Azan. (B): This section is identical to the scheme in (A).
(A, 1). Stalk or infundibulum. (A, 4, 6) Colloid.
(A, 2) Connective tissue capsule. (A, 5) Pars nervosa or posterior lobe or neurohypophysis.
(A, 3) Anterior lobe or pars distalis or adenohypophysis.
(C): Stain Azan, the pars nervosa of the neurohypophysis contains unmyelinated axons derived from the hypothalamus.
Oxytocin and ADH (antidiuretic hormone) are transported from the hypothalamus to the terminal end swellings called Herring bodies.
These bodies (7, arrow) are dilated end-pieces of neurosecretory cells containing stored neurosecretory granules.
A network of capillaries surrounds the axon terminals to facilitate the uptake of released hormones.
Pituicytes are known as a special type of glia cells found in the pars nervosa.
(D, E): Stain Azan, note that the adenohypophysis in (D) shows a gland-like structure with ample blood capillaries.
Adenohypophysis with red-stained α-cells (acidophilic) (8). These acidophilic cells mainly produce somatotropic (GH growth hormone)
and lactotrophes (prolactin PRH).
Bluish-stained β-cells (basophilic) (9). The basophilic cells produce corticotropes (non-glycosylated, ACTH), thyrotropes (TSH) and gonadotropes (FSH, LH).
There are δ-cells (not indicated here). The faintly stained γ-cells (chromophobe) (10) are probably precursor cells or degranulated cells. The ε- cells are indicated with (11).
(F): Stain Azan, intermediary lobe adjacent to the pars nervosa (5). The clear cells (12) in the intermediary lobe are thought to be remnants of the Rathke pouch and they synthesize melanotropin or melanocyte stimulating hormone, MSH and also β-endorphin.
Generally, the acidophilic cells contain polypeptide hormones, basophilic cells contain glycoprotein hormones.
The pars tuberalis is a thin, highly vascularized part of the adenohypophysis that surrounds the infundibular stem. Its main products are gonadotrophes such as FSH and LH. They have also melatonin receptors.
Keywords/Mesh: hypophysis, pituitary gland, adenohypohysis, acidophilic cell, basophilic cell, chromophobe cell, pars nervosa,
Herring body, pituicyte, histology, POJA collection
Title: Pars nervosa, pars distalis and pars intermedia of the human hypophysis (II)
Description:
(A, B): Scheme and survey of hypophysis, stain Azan. (B): This section is identical to the scheme in (A).
(A, 1). Stalk or infundibulum. (A, 4, 6) Colloid.
(A, 2) Connective tissue capsule. (A, 5) Pars nervosa or posterior lobe or neurohypophysis.
(A, 3) Anterior lobe or pars distalis or adenohypophysis.
(C): Stain Azan, the pars nervosa of the neurohypophysis contains unmyelinated axons derived from the hypothalamus.
Oxytocin and ADH (antidiuretic hormone) are transported from the hypothalamus to the terminal end swellings called Herring bodies.
These bodies (7, arrow) are dilated end-pieces of neurosecretory cells containing stored neurosecretory granules.
A network of capillaries surrounds the axon terminals to facilitate the uptake of released hormones.
Pituicytes are known as a special type of glia cells found in the pars nervosa.
(D, E): Stain Azan, note that the adenohypophysis in (D) shows a gland-like structure with ample blood capillaries.
Adenohypophysis with red-stained α-cells (acidophilic) (8). These acidophilic cells mainly produce somatotropic (GH growth hormone)
and lactotrophes (prolactin PRH).
Bluish-stained β-cells (basophilic) (9). The basophilic cells produce corticotropes (non-glycosylated, ACTH), thyrotropes (TSH) and gonadotropes (FSH, LH).
There are δ-cells (not indicated here). The faintly stained γ-cells (chromophobe) (10) are probably precursor cells or degranulated cells. The ε- cells are indicated with (11).
(F): Stain Azan, intermediary lobe adjacent to the pars nervosa (5). The clear cells (12) in the intermediary lobe are thought to be remnants of the Rathke pouch and they synthesize melanotropin or melanocyte stimulating hormone, MSH and also β-endorphin.
Generally, the acidophilic cells contain polypeptide hormones, basophilic cells contain glycoprotein hormones.
The pars tuberalis is a thin, highly vascularized part of the adenohypophysis that surrounds the infundibular stem. Its main products are gonadotrophes such as FSH and LH. They have also melatonin receptors.
Keywords/Mesh: hypophysis, pituitary gland, adenohypohysis, acidophilic cell, basophilic cell, chromophobe cell, pars nervosa,
Herring body, pituicyte, histology, POJA collection