Hypothalamus Flashcards Preview

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Flashcards in Hypothalamus Deck (11):
1

3 Zones

Medial
Lateral
Periventricular

2

6 Inputs for Hypothal

Nuclei of solitary tract: visceral sensory info
Retina: circadian rhythm
Reticular formation: inputs from SC
Limbic/olfactory: signals reg eating and repro
Circumventricular organs that lack BBB
Intrinsic thermo/osmo/chemoRs

3

2 Principal Outputs of Hypothal

Neuronal connections to other parts of brain
Hormones and releasing factors from neurons mainly in perivent zone

4

Diff b/w Thalamus/Hypothal

Thal has direct areas which shuttle specific things to specific places, hypothal integrates a bunch of shit and then releases shit with widespread effects

5

Magnocellular Neurosecretory Cells

Large neurons from perivent region that go to post pit and release ADH/vasopressin and oxytocin into circulation. Dendrites also release oxytocin for CNS communication

6

Parvocellular Neurosecretory Cells

Smaller neurons that secrete RHs into bloodstream that feeds/controls ant pit

7

Feeding/Satiety Geography in Hypothal

Lateral feeding centers and medial satiety centers

8

Leptin

Fat storage cell-produced hormone that slowly builds to decrease appetite (not immediate neg feedback) by inhibiting NPY-secreting cells in hypothal

9

Arcuate Nucleus

Fulcrum for feeding-satiety balance, contains neurons that respond to peptide hormones that control appetite

10

Ghrelin

Neuropeptide released from GI (stomach) just prior to meal to stimulate feeding

11

PYY

Peptide released during feeding that promotes satiety