19.9 Flashcards Preview

Week 19 > 19.9 > Flashcards

Flashcards in 19.9 Deck (15):
1

What is a segmental reflex?

In at one level and out at SAME level.

2

What is an inter-segmental reflex?

Occurs at different levels c.f. segmental reflex.

3

Lumbar puncture is usually performed at the level of ___/___.

L3/L4

4

There is ___ white matter as you move down the spinal cord.

Less - less axons all the way down.

5

Medial motor neurons in the spinal cord supply ___ muscles.

Proximal muscles.

6

Lateral motor neurons in the spinal cord supply ___ muscles e.g. of digits.

Distal muscles.

7

A motor pool is:

ALL motor neurons that innervate a specific muscle.

8

1 motor neuron supplies ___ muscle fibres, but 1 fibre is suppled by only ___ neuron.

1 motor neuron to multiple muscle fibres.
But 1 muscle fibre is innervated by only 1 neuron.

9

A motor unit is:

The muscle fibres controlled by 1 motor neuron!

10

Muscles only contract, therefore coordinate movement is performed by ____

Antagonism

11

The monosynaptic stretch reflex activates the ___ ___ (stretch receptors in muscle).

Muscle spindles.

12

___ ___ are the ONLY sensory organ that connects monosynaptically to motor neurons.

Muscle spindles.

13

The monosynaptic reflex maintains ___ and ___

Posture and stability

14

The muscle spindle and Golgi tendon organ pathways are examples of ___ spinal reflexes

Segmental

15

Inter-segmental reflexes include ___ (cross-extensor) and ___-___ complex reflex actions.

Bilateral (cross extensor) reflex.
Multi-segmental complex reflex actions.