What is this and what does it contain?
- Pituitary gland
How does the optic chiasm relate to the pituitary gland?
Sits on top of it
Which fibres, nasal or temporal, cross at the optic chiasm?
If there is pressure on the optic chiasm, what is the resultant visual field defect?
How many lobes does the pituitary gland have?
Which is larger of the two lobes?
Which of the two lobes is
A) Anterior pit
B) Posterior pit
What is the pars intermedia?
The intermediate between the two lobes
identify the two lobes
Posterior = white
Anterior = pink
What are the 3 types of cells present in the pituitary gland on histology and what colour do they stain?
Acidophilic - Pink
Basophilic - Purple
Chromophobes - don’t stain (chromo- colour . phobes - avoid)
What is a key thing that sets the pituitary apart from other glands?
There is no distinct organisation of the cells
What are the two types of acidophils?
What do somatotrophs secrete?
What do mammotrophs secrete and what is their target organ?
What are the three types of basophils?
What is secreted by the corticotrophs?
MSH (melanocyte stimulating hormone)
What is secreted by thyrotrophs?
What is secreted by gonadotrophs?
What are the main secretory cells in the posterior pituitary?
Axons of magnocellular neurones
What hormones are secreted by the posterior pituitary?
What is the blood supply of the pituitary gland?
The superior and inferior hypophyseal arteries
Which artery out of the superior and inferior hypophyseal artery forms the hypothalamic hypophyseal portal system?
Superior hypophyseal artery
What does the inferior hypophyseal artery supply?
The posterior pituitary
What is the purpose of the hypothalamic hypophyseal portal system?
Allows the hypothalamus to communicate with the anterior pituitary
- Secretes releasing hormones that act on the various cells in the ant pit