Hypothalamus Flashcards

Examine hypothalamic anatomy, including its nuclei, ventricular boundaries, pituitary connections, autonomic control, and endocrine functions.

Card 1 of 30Question

What is the hypothalamus?

A region of the diencephalon that integrates autonomic, endocrine, and homeostatic functions.

In This Section

1. What is the hypothalamus?

A region of the diencephalon that integrates autonomic, endocrine, and homeostatic functions.

2. Where is the hypothalamus located?

Inferior to the thalamus, on either side of the third ventricle and superior to the pituitary gland.

3. Which sulcus separates the thalamus from the hypothalamus?

The hypothalamic sulcus along the lateral wall of the third ventricle.

4. Which ventricular surfaces are formed by the hypothalamus?

The inferior portions of the lateral walls and much of the floor of the third ventricle.

5. Which structures are visible on the inferior surface of the hypothalamus?

The optic chiasm, tuber cinereum, infundibulum, and mammillary bodies.

6. What is the tuber cinereum?

A region of the hypothalamic floor between the optic chiasm and mammillary bodies.

7. What is the infundibulum?

The pituitary stalk connecting the hypothalamus to the pituitary gland.

8. What are the three principal rostrocaudal regions of the hypothalamus?

The anterior or supraoptic, middle or tuberal, and posterior or mammillary regions.

9. What are the three mediolateral zones of the hypothalamus?

The periventricular, medial, and lateral zones.

10. Which hypothalamic nucleus functions as the principal circadian pacemaker?

The suprachiasmatic nucleus.

11. Where is the suprachiasmatic nucleus located?

Immediately superior to the optic chiasm, adjacent to the third ventricle.

12. Which pathway conveys retinal light information to the suprachiasmatic nucleus?

The retinohypothalamic tract.

13. Which hypothalamic nuclei synthesize most circulating vasopressin and oxytocin?

The supraoptic and paraventricular nuclei.

14. Which neural pathway carries hypothalamic hormones to the posterior pituitary?

The hypothalamo-hypophyseal tract.

15. Where are vasopressin and oxytocin released into the systemic circulation?

From axon terminals in the posterior pituitary, also called the neurohypophysis.

16. What is the median eminence?

A specialized hypothalamic region where neurosecretory neurons release regulatory hormones into portal blood.

17. Which vascular system carries hypothalamic releasing and inhibiting hormones to the anterior pituitary?

The hypothalamo-hypophyseal portal system.

18. Which hypothalamic nucleus is an important source of dopamine that inhibits prolactin secretion?

The arcuate nucleus.

19. Which hypothalamic nucleus contains neurons that monitor circulating leptin and other metabolic signals?

The arcuate nucleus.

20. Which hypothalamic nucleus is strongly associated with promoting satiety?

The ventromedial hypothalamic nucleus.

21. Which hypothalamic region contains orexin-producing neurons that help maintain wakefulness?

The lateral hypothalamic area.

22. Which anterior hypothalamic region is particularly important for heat dissipation?

The preoptic and anterior hypothalamic area.

23. Which hypothalamic region contributes to heat conservation and thermogenic responses?

The posterior hypothalamic region.

24. What are the mammillary bodies?

Paired rounded structures on the inferior posterior hypothalamus involved in memory circuits.

25. Which fiber bundle connects the hippocampal formation to the mammillary bodies?

The fornix.

26. Which tract connects the mammillary bodies to the anterior thalamic nuclei?

The mammillothalamic tract.

27. Which arteries provide major blood supply to the hypothalamus?

Perforating branches from the anterior cerebral, anterior communicating, posterior communicating, and posterior cerebral arteries.

28. What is the tuberomammillary nucleus?

A posterior hypothalamic nucleus containing histaminergic neurons involved in promoting wakefulness.

29. What endocrine disorder can result from damage to hypothalamic vasopressin-producing neurons?

Central diabetes insipidus, caused by insufficient vasopressin secretion.

30. Which sleep disorder is strongly associated with loss of hypothalamic orexin-producing neurons?

Narcolepsy type 1.