Hypophysis (Pituitary Gland) - Coggle Diagram
Hypophysis (Pituitary Gland)
pars intermedia: It lies across the cleft from the pars distalis and adjacent to the neurohypophysis
These cells most likely produce melanocyte stimulating hormone (MSH) and possibly ACTH
contains the portal system, very vascular, releasing hormones from the hypothalamus are carried tot he pars distalis
produce adrenocorticotropic hormone (ACTH), thyroid stimulating hormone (TSH), follicle stimulating hormone (FSH) and luteinizing hormone (LH)
may be precursors to acidophils and basophils
produce growth hormone (GH) and prolactin (PR)
Where hormones from the hypothalamus are released to capillary beds. There are no secretory cells in the pars nervosa.
Cells of the pars nervosa are fibroblasts, mast cells, endothelial cells or pituicytes. Pituicytes probably act as glial cells in the pars nervosa.
Hypothalamus: Two hormones released by cells in the hypothalamus= oxytocin and Antidiuretic hormone (ADH)
Oxytocin= suckling stimulus releases oxytocin; stimulates contraction of contractile cells in the mammary glands for “milk letdown” (ejection of milk from the glands); stimulates uterine smooth muscle contraction at parturition (birth).
ADH= targets the kidney; concentrates urine by stimulating the removal of water from urine in the collecting ducts; decreases rate of perspiration; increases blood pressure by preserving blood volume and by stimulating contraction of smooth muscle in the walls of arterioles.
between the pars distalis and pars intermedia