Lecture 5 (2/3) Flashcards Preview

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Flashcards in Lecture 5 (2/3) Deck (21):
1

Homeostasis

Regulation of the pituitary gland, maintains equilibrium in the body.

2

Pituitary Gland

aka Hypophysis
Small, pea-sized swelling at the base of the hypothalamus

3

Sellar Turcica

The bony cavity in which the pituitary gland
Covered by a dural fold called seller diaphragm

4

Sellar Diaphragm

AKA Diaphragm Sellar
A dural fold that covers the seller turcica

5

Adenohypophysis

Anterior portion of the pituitary gland
Where the hormones are produced

6

Neurophypophysis

Posterior portion of the pituitary gland
Extension of the hypothalamus

7

Adipsia

Caused by a small lesion in the hypothalamus

Lack of desire to drink

8

Satiety Center

Located ventral medially of the hypothalamus

A lesion here leads to Hyperphagia and aggressive behavior

9

Hyperphagia

Eating too much - leads to obesity

10

Dysphagia

Caused by a lesion in the lateral portion of the hypothalamus

Trouble eating

11

Supraoptic Nucleus

In the anterior portion of the hypothalamus

Involved in regulating water balance in the body
Allows us to feel thirsty or feel the need to urinate

12

Polydipsia

Caused by a lesion in the supraoptic nucleus

Increased water intake

13

Polyuria

Caused by a lesion in the supraoptic nucleus

Increased urination

14

Vasoconstriction

When the muscles are signaled to shiver in order to generate heat

15

Hyperthermia

Caused by a lesion to the anterior portion of the hypothalamus

Increased body temperature

16

Hypothermia

Caused by a lesion to the posterior portion of the hypothalamus

Decreased body temperature

17

Epithalamus

Lies above the thalamus

Has 3 Substructures:
Pineal Body
Stria Medullares
Habenula

18

Pineal Body/Gland

Portion of the epithalamus

Receives visual information about light and darkness
Secretes chemicals into the bloodstream that are associated with sleep/wake cycles

19

Stria Medullares

Carries the circadian rhythm

20

Subthalamus

A structure found in the caudal portion of the diencephalon

3 Main Structures:
fields of Forel
Zona Incerta
Subthalamic Nucleus

21

Subthalamic Nucleus

Connected to a structure called Globus Pallidus

Receives fibers from the motor cortices

Damage to the sub thalamic nucleus results in involuntary movements, especially in the upper limbs.