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Flashcards in Neuroscience Deck (76)
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1

The function of the brainstem is

-postural control & locomotion
- a large number of facial connections
-Arousal and awareness

2

The brainstem is composed by

-hindbrain
-midbrain
-medulla
-pons

3

The cerebellum receives inputs from:

-receives input from spinal cord (feedback about movements)
-receives input from cerebral cortex (planning of movements)

4

The main purpose of the cerebellum

adjust the motor responses based on comparison of sensory feedback and planned movement

5

Diencephalon is composed by

-Thalamus
-Hypothalamus

6

Thalamus role

receives almost all information going to the cortex

7

Cerebral hemispheres composed by

-cerebral cortex
-basal ganglia

8

Basal ganglia function

planning of motor strategies

9

Areas of the basal ganglia

-Caudate nucleus
-Putamen
-Globus Pallidus
-Substantia Nigra

10

Cerebral cortex function

programming events

11

What is action potential?

Neurons that are excited have positive nerve impulses, or spikes

12

3 types of synaptic transmission

-summation (spatial vs temporal
-synaptic facilitation (releasing more transmitter)
-defacilitation (habitutation)

13

Spatial summation

larger presynaptic neurotransmitters are released until AP

14

temporal summation

a single presynaptic neuron is activated at a high enough frequency to elicit AP

15

Pheripheral Receptors

-Muscle spindle
-Golgi tendon organs
-Cutaneous receptors

16

Muscle spindle is concerned with

length or stretch

17

Where in the body do we find the highest percentage of spindles?

-eyes
-neck
-hands

18

What is the spindle made up of?

-Intrafusal fibers (nuclear bag, nuclear chain)
-Afferent neurons (Ia & II)
-Gamma motor neurons (gamma dynamic, gamma static)

19

Alpha motor neurons excite?

Extrafusal fibers

20

Gamma motor neurons excite

Intrafusal fibers

21

Gamma motor neurons are important for?

muscle tone

22

Dynamic stretch

connects to bag fiber

23

Static stretch

connects to bag and chain fiber

24

Ia

connects to bag and chain fiber

25

II

connects to chain

26

Ascending pathways

Dorsal column-medial leminiscal (DC-ML)

27

dorsal column- medial leminiscal is involved with

-fine touch
-vibration
-2 point discrimination
-propioception

28

The Dorsal column- medial leminiscal decussation point occurs?

-lower medulla

29

Pathways for descriminative touch and conscious propioception how many neurons relay?

three-neuron

30

1st order neuron

from receptors to to the medulla