8.1 The Control Of Movement Flashcards Preview

Behavioral Neuroscience > 8.1 The Control Of Movement > Flashcards

Flashcards in 8.1 The Control Of Movement Deck (19):
1

Skeletal muscles

Also known as striated muscles; control movement of the body in relation to the environment

2

Cardiac muscles

Also known as the heart muscles; have properties intermediate between those of smooth and skeletal muscles

3

Neuromuscular junction

A synapse way motor neuron axon meets a muscle fiber

4

The function of acetylcholine in the skeletal muscles

In skeletal muscles every axon releases acetylcholine at the neuromuscular junction, and the acetylcholine always excites the muscle to contract

5

Antagonistic muscles

Opposing sets of muscles

6

Flexor

Muscle that flexes or raises

7

Extensor

Muscle that extends or straightens

8

Myasthenia gravis

An autoimmune disease; the immune system attacks acetylcholine receptors at neuromuscular junctions; The symptoms are progressive weakness and rapid fatigue of the skeletal muscles

9

Fast-twitch fibers

Produce fast contractions but fatigue rapidly

10

Slow-twitch fibers

Produce a less vigorous contractions without fatiguing

11

Proprioceptor

The receptor that is sensitive to the position or movement of a part of the body

12

Stretch reflex

Caused by a stretch; it does not result in a stretch

13

Muscle spindle

The proprioceptor; A receptor parallel to the muscle the response to the stretch muscle

14

Golgi tendon organ

A proprioceptor; response to increases in muscle tension

15

Reflexes

Consistent automatic responses to stimuli

16

Ballistic movement

Executed as a whole; once initiated it cannot be altered or it's aim corrected; i.e. a reflex

17

Central pattern generators

Neural mechanisms in the spinal cord or elsewhere that generate rhythmic patterns of motor output

18

Motor program

Fixed sequence of movements; can be produced by a central pattern generator; Can be either learned or built into the nervous system

19

Smooth muscles

Control movement of internal organs