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EM005
Anatomy of the Hypothalamus and Pituitary
| Question | Answer |
|---|---|
| What separates the pituitary from the base of the brain? | diaphragma sellae, which covers the pituitary gland |
| What passes through the cavernous sinus? | cranial nerves III (oculomotor), IV (trochlear), VI (abducens) and the ophthalmic and maxillary divisions of V (the trigeminal nerve). |
| What hormones are found in the posterior pituitary? | ADH (vasopressin), oxytocin |
| What is the blood supply difference for the anterior and posterior pituitary? | The anterior pituitary (adenohypophysis) has a portal system from the hyothalamus. The neurohypophysis has a direct arterial blood supply from the inferior hypophyseal arteries. |
| What cell types are found in the adenohypophysis and are they acidic or basic? | Acidophils:(red cells) – GH, PRL secreting cells, Basophils: (blue cells) – ACTH, TSH, FSH, LH secreting cells |
| What are the 5 nuclei that regulate hormone release from the anterior and posterior pituitary? | Supraoptic, paraventricular, preoptic, arcuate, preiventicular |
| Which hormones are released by the supraoptic nucleus? | ADH (vasopressin), oxytocin |
| Which hormones are released by the paraventricular nucleus? | oxytocin, ADH, CRH |
| Which hormones are released by the preoptic nucleus? | GnRH (LHRH) |
| Which hormones are released by the arcuate nucleus? | GnRH, GHRH, dopamine (PIF) |
| Which hormones are released by the periventircular nucleus? | TRH, somatostatin (GHIH) |