Anatomy And Hormones Of Pituitary, Hypothalmic Releasing Hormones Flashcards

0
Q

Neurohypophysis

A
Posterior lobe
Neural lobe
Pars nervosa
Infundibular stem 
Median eminence
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1
Q

Adenohypophysis

A
Anterior lobe
Glandular lobe
Pars distalis
Pars tuberalis
Pars intermedia
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2
Q

Embryology of pituitary

A

Forms as two separate pieces
Ectodermal up growth from roof of mouth->ant lobe
Neuroectodermal down growth->post. Lobe
Small portion of Rathkes pouch may persist as ectopic pituitary tissue

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3
Q

Blood supply

A

Superior hypophyseal artery-> stalk-> capillaries->portal vessels
Inferior hypophyseal artery->bottom of post pit
Portal vessels-> capillary plexus in ant pit-> inferior hypophyseal veins

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4
Q

Control of hormone release from anterior pituitary

A

Cell bodies in brain(arcuate nucleus, ventromedial nucleus, preoptic nucleus)-> neurones to ant. Pit->portal veins in to stem->capillary plexus->releasing/inhibitory factors

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5
Q

Control of posterior pituitary

A

Oxytocin and ADH

Paraventricular nucleus and supra optic nucleus->hypophyseal tract-> capillary plexus

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6
Q

Cells of anterior pituitary

A
Chromophils-> actively secreting 
    Acidophils 40%
       Somatotrophs-> GH
       Mammotrophs->prolactin
    Basophils 10% 
       Corticoids-> ACTH
       Thyrotrophs->TSH 
    Cells secreting glycoproteins 10%
        Gonadotropins->LH, FSH 
Rest are chromophobes-> reserve
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7
Q

Relations of the pituitary

A

Optic tract
Cavernous sinus
Compressed by tumours

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