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36 Cards in this Set

  • Front
  • Back
Pituitary- also called?
Define Pituitary
A small endocrine gland occupying the hypophyseal fossa of the sphenoid bone and attached to the hypothalamus by the infundibulum.
pituitary gland
No longer the "master gland", but the hypothalamus!
Pea sized
Size of pituitary or hypophysis?
hypophyseal fossa (pouch)
Location of Pituitary or hypophysis
Hypophyseal fossa
a depression on superior surface of sphenoid bone that houses pituitary glands
Divisions of pituitary
Anterior Lobe
Posterior Lobe
Pars Intermedia
Anterior lobe, also called?
Anterior lobe
in embryo-migrates from upper pharynx to its adult position
Hypophoseal (rathke's) pouch
outgrowth of ectoderm from roof of mouth- anteriorpituitary develops
Anterior lobe
Location of rathke's pouch?
Posterior lobe, also called?
Posterior lobe
Does not synthesize hormones, stores and releases hormones
Neurohypophyseal bud
Develops and grows down from hypothalamus
posterior lobe
Location fo nuerohypophyseal bud?
Pars intermedia
atrophies in fetal development-is gone ias a lobe in adults- but its cell migrate into the ant. pituitary and persist
Neurosecretory cells
Actually secrete hypothalamic releasing and inhibiting hormones
Regulating hormones (factors)
At least 9 known releasing and inhibiting hormones; are "tropic hormones" -from neurosecretory cells- stimulate or inhibit hormones secreted from ant. pituitary.
Vessels and capillary networks
What permits regulating factors to flow from hypothalmus to anterior pituitary?
How mant major hormones are there?
Tropic hormones
a hormone whose target organ is another endocrine gland
Adrenocorticotropic hormone ACTH:
stimulates adrenal cortex
Thyroid-stimulating hormone TSH:
stimulates thyroid gland
Gonadotropic hormones:
Follicle stimulating hormone FSH:
Male- stimulates sperm production
Luteinizing hormone LH:
Male-interstitial cell development and thus testosterone up
Non-tropic hormones
3- hGH, melanocyte- stimulating hormone, PRL
Growth hormone hGH:
increased protein anabolism in cells
Melanocyte-stimulating hormone
increase in melanin granules in melanocytes
Male- testosterone production up

Female- maintain effect of lutenizing hormone
Oxytocin OT:
a nuerosecretory cell, smooth muscle contraction of uterus during labor; of mammary glands thus stimulating milk ejection
Do neurosecretory cells synthesize hormones?
Anti-diuretic hormone ADH:
a nuerosecretory cell, also called "vasopressin"- decrease urine volume; constriction of arterioles during hemorrage
neurohypophysis (posterior to pituitary) also stores hormones
Where do axonal endings of nuerosecretory cells terminate?
Because it doesn't synthysize hormones; it sores and releases them.
Why is the neurohypophysis not considered to be a true endocrine gland?
axon terminals in the post. pituitary gland are associated with specialized neuroglia