Hypothalamus

Question 1

3 Zones

Answer 1

Medial
Lateral
Periventricular

Question 2

6 Inputs for Hypothal

Answer 2

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

Question 3

2 Principal Outputs of Hypothal

Answer 3

Neuronal connections to other parts of brain

Hormones and releasing factors from neurons mainly in perivent zone

Question 4

Diff b/w Thalamus/Hypothal

Answer 4

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

Question 5

Magnocellular Neurosecretory Cells

Answer 5

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

Question 6

Parvocellular Neurosecretory Cells

Answer 6

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

Question 7

Feeding/Satiety Geography in Hypothal

Answer 7

Lateral feeding centers and medial satiety centers

Question 8

Leptin

Answer 8

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

Question 9

Arcuate Nucleus

Answer 9

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

Question 10

Ghrelin

Answer 10

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

Question 11

PYY

Answer 11

Peptide released during feeding that promotes satiety