Hypothalamus

Question 1

Where is the hypothalamus located?

Answer 1

Walls and floor of the third ventricle

Question 2

What are the 4 anterior-to-posterior zones of the hypothalamus?

Answer 2

Pre-optic, Supra-optic, Tuberal, Mammillary

Question 3

Which zone contains the Paraventricular and Suprachiasmatic nuclei?

Answer 3

Supra-optic (Anterior) zone

Question 4

Which zone contains the Arcuate, Ventromedial, and Dorsomedial nuclei?

Answer 4

Tuberal (Middle) zone

Question 5

Which zone contains the Mammillary bodies?

Answer 5

Mammillary (Posterior) zone

Question 6

What is the mnemonic for the 4 main systems the hypothalamus regulates?

Answer 6

HEAL

Question 7

What does “H” stand for in HEAL?

Answer 7

Homeostasis

Question 8

What does “E” stand for in HEAL?

Answer 8

Endocrine

Question 9

What does “A” stand for in HEAL?

Answer 9

Autonomic

Question 10

What does “L” stand for in HEAL?

Answer 10

Limbic

Question 11

What is the function of the Preoptic nucleus?

Answer 11

Thermoregulation

Question 12

Which two nuclei synthesize Oxytocin and Vasopressin (ADH)?

Answer 12

Supraoptic and Paraventricular nuclei

Question 13

What is the function of the Suprachiasmatic nucleus?

Answer 13

“Master clock” for circadian rhythms

Question 14

Which tract provides direct input to the Suprachiasmatic nucleus?

Answer 14

Retinohypothalamic tract (from retinal ganglion cells)

Question 15

Which hypothalamic area inhibits arousal to promote Non-REM sleep?

Answer 15

Ventral Lateral Preoptic area (VLPO) / Anterior hypothalamus

Question 16

Which hypothalamic area stimulates wakefulness (using histamine/orexin)?

Answer 16

Posterior hypothalamus

Question 17

Which hypothalamic area stimulates appetite?

Answer 17

Lateral hypothalamus

Question 18

Which hypothalamic nucleus inhibits appetite?

Answer 18

Ventromedial nucleus

Question 19

Which hormone from adipose tissue reduces appetite (binds to Ob receptors)?

Answer 19

Leptin

Question 20

Which hormone from gastric mucosal cells stimulates appetite?

Answer 20

Ghrelin

Question 21

What triggers thirst sensation in the anterior hypothalamus?

Answer 21

Osmoreceptors (detecting osmolarity changes)

Question 22

What is the function of ADH (secreted by Supraoptic/Paraventricular nuclei)?

Answer 22

Conserves body water

Question 23

Damage to the anterior hypothalamus results in what water-balance issue?

Answer 23

Dehydration

Question 24

How does the Anterior hypothalamus respond to rising body temperature?

Answer 24

Activates heat dissipation mechanisms

Question 25

How does the Posterior hypothalamus respond to body temperature?

Answer 25

Conserves body heat

Question 26

What is the result of damage to the Anterior hypothalamus?

Answer 26

Hyperthermia

Question 27

What is the result of bilateral damage to the Posterior hypothalamus?

Answer 27

Poikilothermia (temperature varies with environment)

Question 28

Which nuclei control the anterior pituitary (Endocrine system)?

Answer 28

Arcuate, Ventromedial, and Dorsomedial nuclei

Question 29

How do hypothalamic hormones reach the anterior pituitary?

Answer 29

Through a specialized portal blood vessel system

Question 30

How do hypothalamic hormones reach the posterior pituitary?

Answer 30

Via axons projecting down the pituitary stalk

Question 31

Which hormones are released in the posterior pituitary?

Answer 31

ADH and Oxytocin

Question 32

Which nucleus is the primary control center for the Autonomic Nervous System?

Answer 32

Paraventricular nucleus

Question 33

What is the main descending autonomic pathway from the hypothalamus?

Answer 33

Medial Forebrain Bundle (MFB)

Question 34

What is the main function of the Mammillary bodies?

Answer 34

Recollective memory (specific episodes/places)

Question 35

The Mammillary bodies are part of which famous circuit?

Answer 35

Papez Circuit

Question 36

In the Papez circuit, the Mammillary bodies project to which structure?

Answer 36

Anterior Thalamic Nuclei (via Mammillothalamic tract)

Question 37

What do Hypothalamic-Limbic loops regulate?

Answer 37

Emotional influence on autonomic/homeostatic pathways (e.g., sweaty palms from anxiety)

Question 38

Clinical signs of Anterior Hypothalamus damage:

Answer 38

Insomnia, dehydration, hyperthermia

Question 39

Clinical signs of Posterior Hypothalamus damage:

Answer 39

Hypersomnia (somnolence), poikilothermia

Question 40

Clinical signs of Lateral Hypothalamus damage:

Answer 40

Weight loss

Question 41

Clinical signs of Medial Hypothalamus damage:

Answer 41

Weight gain