Flashcards in Nervous System 8 Deck (12):
The gray matter of the spinal cord is organized into
The axons of sensory neurons synapse with
other neurons in the posterior horn.
The cell bodies of somatic motor neurons are in
the anterior horn.
The cell bodies of autonomic motor neurons are in
the lateral horns.
Decussation occurs where in the brain
pyramids of medulla oblongata
How many pairs of spinal nerves are there?
How many spinal nerves contain sensory and motor fibers?
ALL of them
The ventral root of a spinal nerve contains
motor neuron axons
A reflex arc is a _____ _____ involving a sensory neuron and a motor neuron
How many association neurons may be involved in some reflexes?
one or more
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