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Flashcards in Nervous System 8 Deck (12):
1

The gray matter of the spinal cord is organized into

horns

2

The axons of sensory neurons synapse with

other neurons in the posterior horn.

3

The cell bodies of somatic motor neurons are in

the anterior horn.

4

The cell bodies of autonomic motor neurons are in

the lateral horns.

5

Decussation occurs where in the brain

pyramids of medulla oblongata

6

How many pairs of spinal nerves are there?

31

7

How many spinal nerves contain sensory and motor fibers?

ALL of them

8

The ventral root of a spinal nerve contains

motor neuron axons

9

A reflex arc is a _____ _____ involving a sensory neuron and a motor neuron

neural pathway

10

How many association neurons may be involved in some reflexes?

one or more

11

Steps of a reflex

1. Stimulus activates receptor
2. Nerve impulse travels through sensory neuron to the spinal cord
3. Nerve impulse is processed in the integration center by interneurons
3.5. Some of the impulse goes to brain, if enough neurons activate interneurons, then step 4
4. Motor neuron transmits nerve impulse to effector

12

White matter is what?

Myelinated axons