Hypothalamus and limbic System Flashcards Preview

Physiology 2130 > Hypothalamus and limbic System > Flashcards

Flashcards in Hypothalamus and limbic System Deck (14):
1

What is the hypothalamus composed of?

Neurons which control the internal environment

2

What does the hypothalamus influenced by and work with?

Limbic system: higher control system located in the brain

3

Why is the position of the hypothalamus important?

It is in an area in which it can influence the ANS, Pituitary glad and the endocrine system
-can also integrate info about visceral functions in the internal environment together with the information from CNS (peripheral nervous system) that signals about the external environment and past experiences

4

In the brain where is the hypothalamus located?

Beneath the thalamus and about the pituitary gland
-extends from the pre-optic region near the optic chiasma postally to the mammillary bodies caudally

5

What are the 9 functions of the hypothalamus?

1. Control of the ANS (BP,hormones, respiration)
2. Neuroendocrine control (Posterior pituitary, catecholamine release)
3. Reproduction (behaviour and hormones)
4. Water Balance and Exchange (release and absorption of water)
5. Sodium Balance Exchange (plasma osmolarity)
6. Body Energy Balance and Exchange (nutrient intake and metabolism)
7. Drive and Emotions (Feeding, attack behaviour)
8. Circadian Rythme (24hr biological rythme)
9. Body Temperature Regulation

6

What is the inside of the hypothalamus composed of?

Multiple sub nuclei that is devoted to controlling a certain body function

7

How do the hypothalamic nuclei know what they are doing?

Every nuclei is connected to another and they are all able to talk to each other to know what is going on and to signal to each other which section does what and how much
-reciprocal connections

8

What is the difference between the posterior and anterior pituitary interns of substances being released?

Posterior: Are released right into the blood stream
Anterior: Need to be turned on to release something

9

What are the 8 hypothalamic nuclei that we need to know?

1. Supraoptic
2. Suprachiasmatic
3. Arcuate
4. Paraventricular
5. Lateral
6. Preoptic/Anterior Hypothalamic Region
7. Posterior Hypothalamus
8. Basomedial Hypothalamus

10

Why does the hypothalamus associates with the limbic system? What is the end goal basically?

Contributes to the higher order integration of autonomic, endocrine and behavioural responses for homeo static regulation of the internal environment and for adaptation of the animal to the continuously changing external environment
-makes sure housekeeping chores occur routinely

11

Why type of information does the hypothalamus receive (mostly) from the limbic system?

Motion and memory information is fed into the hypothalamus ignorer for the hypothalamus to know what to do next
-also takes what you did in the past to fix the problem into account and whether or not you can do the same thing

12

What is the hypothalamus considered the master controller of?

The autonomic nervous system

13

Since the hypothalamus controls the the ANS, what happens to the following when we active the posterior hypothalamic neurons?
-Blood Pressure
-Heart Rate
-Gastrointestinal mobility
-Pupil Size

BP: SNS is turned on and will INCREASE blood pressure
Heart Rate: SNS is turned on to INCREASE heart rate
Gastro Motility: SNS is turned on and DECREASES motility
Pupil Size: SNS is turned on to INCREASE pupil size

14

Since the hypothalamus controls the the ANS, what happens to the following when we active the anterior hypothalamic neurons?
-Blood Pressure
-Heart Rate
-Gastrointestinal mobility
-Pupil Size

BP: PSNS is turned on to DECREASE blood pressure
Heart Rate: PSNS is turned on to DECREASE heart rate
Gastro Motility: PSNS is turned on to INCREASE motility
Pupil Size: PSNS is turned on to DECREASE pupil size