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Flashcards in Hypothalamus & Limbic System Deck (44)
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1

What separates the thalamus from the hypothalamus?

Hypothalamic sulcus

2

The hypothalamus is structurally part of the _____ and functionally part of the _____ system.

Diencephalon; libic

3

What is the relationship between the hypothalamus and the third ventricle?

forms the walls of the anterior portion of the third ventricle

4

Which structures form the posterior portion of the hypothalamus?

Mammillary bodies

5

Which ventricle is hypothalamus bordered by?

Third

6

Which structure links the hypothalamus to the pituitary gland?

The Infundibulum (originates at tuber cinereum)

7

What part of the pituitary is the hypothalamus vascularly connected to?

Anterior

8

What part of pituitary is hypothalamus neurally connected to?

Posterior

9

What is the function of the anterior area nuclei (e.g., suprachiasmatic, supraoptic, paraventricular, anterior)

Sleep, eating, parasympathetic, circadian rhythms

10

What is the function of the posterior area nuclei (e.g., posterior nucleus, mamillary bodies)

Sympathetic, upregulation of BT, arousal, wakefulness

11

The hippocampus is located where relative to the lateral ventricle

Just inferior to the inferior horn

12

On a  coronal section, is the amygdala visible anteriorly or posteriorly to the hippocampus

ANTERIORLY - note that you cannot view the inferior horns of the lateral ventricle in this coronal section

13


Which for structures (not tracts) are implicated in the Papez circuit?


1) Hippocampus 2) Mamillary bodies (3) Anterior thalamic nuclei; 4) Cingulate cortex

14

Which 4 fibre tracts are implicated in the Papez circuit

1) Fornix; 2) Mamillothalmic tract; 3) IC; 4) Cingulum

15

Describe the flow of information in Papex circuit (starting at hippocampus)

16

what is the lamina terminalis?

Membrane extending from the anterior commissure inferiorly to the rostral edge of the optic chiasm; anterior boundary of the hypothalamus

17

Which zone (lateral vs. medial) contains most of the functionally important hypothalamic nuclei?

Medial zone

18

What are the three functional areas of the hypothalamus along the anterior-posterior axis?

Anterior, middle, posterior

19

Where are the preoptic and anterior nuclei and what is their function?

1) Medial Zone (anterior area); 1) heat loss, response to heat, parasympathetic activity, sleep

20

Where is the suprachiasmatic nucleus and what is its function

Anterior hypothalamus/medial zone; circadian rhythms, secretes releasing/inhibiting hormones

21

Where is the supraoptic nucleus and what is its function

Medial zone/anterior; secretes hormones (oxytocin, vasopression, antidiuretic)

22

Where is the paraventricular nucleus and what is its function

Anterior area (medial zone); hormone secretion from magnocellular and parvocellular cells

23

Which five nuclei are present in the anterior hypothalamus?

PPASS - paraventricular, preoptic, anterior, supraoptic, suprachiasmatic

24

What are the three middle/tuberal nuclei

Arcuate, Ventromedial, Dorsomedial

25

Which hypothalamic nucleus is involved in satiety (hunger suppression)

Ventromedial

26

Where is the dorsomedial hypothalamic nucleus and what is its function

Middle/tuberal region; circadian and emotional regulation

27

Where is the arcuate nucleus and what does it do?

Middle/tuberal region, secretes hormones

28

What are the nuclei of the posterior region?

Posterior nucleus; mamillary body

29

What is the role of the posterior nucleus? Where is it?

Posteriro region; sympathetic activity; heat response; arousal wakefulness

30

Which two hypothalamic nuclei have opposing roles?

Preoptic and anterior (parasympathic) vs. Posterior (sympathetic)