Pituitary Gland

Question 1

Also called HYPOPHYSIS CEREBRI

0.5 grams

Answer 1

Pituitary Gland

situated in the hypophyseal fossa in the sella turcica of the sphenoid bone

Question 2

Anterior (Adenohypophysis)

ORIGIN: Hypophysial pouch/Rathke (from the roof of primitive mouth)

Answer 2

Pars Distalis - largest; hormone secretion

Pars intermedia

Pars distalis

Question 3

Posterior (Neurohypophysis)

ORIGIN: Neurohypophysial pouch (from the forebrain - diencephalon)

Answer 3

Pars Nervosa - main section composed of neural tissue

Infundibulum - stalk-like attachments to the hypothalamus

Question 4

Pars distalis secretion

Answer 4

ACIDOPHILS
GH
Prolactin

BASOPHILS
FSH
LH
TSH
ACTH

Question 5

Pars intermedia secretion

Answer 5

MSH

Question 6

Pars nervosa secretion

Answer 6

ADH (supraoptic)

Oxytocin (paraventricular)

Question 7

Most abundant cell type in the POSTERIOR pituitary

Answer 7

Pituicytes - highly branched glial cells w/ metabolic functions

Question 8

Blood supply of Anterior (Adenohypophysis)

Answer 8

ICA – SUPERIOR HYPOPHYSEAL ARTERY

Question 9

Blood supply of Posterior (Neurohypophysis)

Answer 9

SUPERIOR HYPOPHYSEAL ARTERY

INFERIOR HYPOPHYSEAL ARTERY

Infundibular artery

Question 10

Enlargement of the pituitary gland d.t. a tumor results in the gland expanding superiorly and pressing what structure

Answer 10

Optic Chiasm (Diaphragmatic sellae)

Pituitary Adenoma –> Bitemporal Hemianopsia