Motor Systems and Locomotion Flashcards Preview

Biology of The Mind > Motor Systems and Locomotion > Flashcards

Flashcards in Motor Systems and Locomotion Deck (16):
0

What is the final effector pathway?

Brain to spinal cord to muscle

1

What is another word for motor neurone?

Motoneurone

2

What does the lower motor neurone consist of?

Motoneurones which form a spindle like motorpool

3

Where are distil and proximal muscles represented in a motor pool?

Distil are lateral and proximal are medial

4

What is a motor unit?

Innervated muscle fibres connected to a motoneurone

5

What does the muscle spindle do for the CNS?

Constantly tells it it's position in space

6

What is the muscle spindle?

The sensory apparatus of muscle- intrafusal fibres

7

What does the spindle detect?

Changed in muscle length

8

What do extrafusal muscle fibres do?

Form the bulk of muscle and generate tension. They receive motor innervation from alpha motor neurones.

9

Where do intrafusal muscle fibres receive their motor innervation from?

Gamma motor neurones

10

What is the Golgi tendon organ?

A mechanoreceptor which lies in a series of muscle fibres and detects changes in tension. It stops myself tearing and contributes to proprioception

11

What are the four groups of sensory afferents in a muscle spindle?

Primary afferent (1a)- senses stretch and rate of change in stretch
Secondary afferent (2)- stretch
3: finer that 1a and 2- nociceptive from muscle
From tendon organs (1b)- signal force change in muscle

12

What is a monosynaptic reflex?

Stretch reflex goes to muscle spindle 1a afferent goes to homonymous alpha motor neurone to output.

13

What is a polysynaptic reflex?

Crosses extension reflex (FRA reflex) goes to sensory afferent to interneurone to motor neurone to output.

14

How can the loss of a motor unit be overcome?

Make the rest of the motor units do more work

15

What does the loss of the brain lead to?

Some degree of release or disarray