Lecture 33: The Pituitary Gland and the Hypothalamus: What is the Connection? Flashcards Preview

HUBS 191💃✨ > Lecture 33: The Pituitary Gland and the Hypothalamus: What is the Connection? > Flashcards

Flashcards in Lecture 33: The Pituitary Gland and the Hypothalamus: What is the Connection? Deck (8):
1

The pituitary gland is broken up into two parts:

- Anterior lobe
- Posterior lobe
- They both secrete their own hormones

2

Pituitary Hormones:

- Anterior:
Growth hormone
ACTH
Thyroid-regulating ormone
Gonadotropic (sex) hormones
Prolactin ; tropic and have their own effects
- Posterior
Antidiuretic / vasopressin hormone
Oxytocin

3

Different anterior pituitary hormonal pathways:

- Hypothalamus Pituitary Gonadal Axis:
GnRH
FSH + LH
Gonads
Estrogen + testosterone secretion
- Hypothalamus Pituitary Adrenal Axis:
CRH
ACTH
Adrenal cortex
Cortisol secretion
- PRH / PIH
- Prolactin + / -
- Breast development and milk production
- TRH effects prolactin output
- TSH
- Thyroid Gland
- T3, T4 secretion
- GHRH
- Growth Hormone
- Nutrient metabolism and tissue growth
- SS negatively effects growth hormone and TSH

4

Releasing hormone = ?

- Hormones come from hypothalamus

5

How does information get to the posterior pituitary lobe?

- Axon terminals ending in posterior lobe of the pituitary gland, cell bodies in hypothalamus
- Neural communication

6

Hormones released by the posterior pituitary:

- Antidiuretic hormone : stimulates the kidneys to reabsorb water
- Oxytocin : uterine musles & milk release
- Both hormones are made in the hypothalamus and stored in the pituitary glands

7

What does ADH do?

- If it's absent we have a large volume of dilute urine
- If it's present, water is reabsorbed by the kidneys

8

Oxytocin is a form of...

- Positive feedback

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