Nervous System 8 Flashcards
1
Q
The gray matter of the spinal cord is organized into
A
horns
2
Q
The axons of sensory neurons synapse with
A
other neurons in the posterior horn.
3
Q
The cell bodies of somatic motor neurons are in
A
the anterior horn.
4
Q
The cell bodies of autonomic motor neurons are in
A
the lateral horns.
5
Q
Decussation occurs where in the brain
A
pyramids of medulla oblongata
6
Q
How many pairs of spinal nerves are there?
A
31
7
Q
How many spinal nerves contain sensory and motor fibers?
A
ALL of them
8
Q
The ventral root of a spinal nerve contains
A
motor neuron axons
9
Q
A reflex arc is a _____ _____ involving a sensory neuron and a motor neuron
A
neural pathway
10
Q
How many association neurons may be involved in some reflexes?
A
one or more
11
Q
Steps of a reflex
A
- Stimulus activates receptor
- Nerve impulse travels through sensory neuron to the spinal cord
- Nerve impulse is processed in the integration center by interneurons
- Some of the impulse goes to brain, if enough neurons activate interneurons, then step 4
- Motor neuron transmits nerve impulse to effector
12
Q
White matter is what?
A
Myelinated axons
