Nervous System III Flashcards
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How many pairs of spinal nerves connect the CNS to muscles, receptors and glands?
31
What are the two primary functions for the spinal cord and spinal nerves?
- Pathway for sensory and motor impulses
2. Responsible for reflexes
How are spinal nerves named?
They are named for the vertebra they are below.
The spinal cord is protected and encapsulated by _______________.
Spinal Cord Meninges
What are the three layers of the spinal cord meninges?
- Dura mater
- Arachoid
- Pia mater
The central canal of the spinal cord contains _____________.
Cerebrospinal Fluid
Which roots (anterior/posterior) contain motor neuron axons?
Anterior
Which roots (anterior/posterior) contain sensory neuron axons?
Posterior
___________ contains the cell bodies of the sensory axons.
Dorsal root ganglion
Anterior and posterior root unite within the _____________ to become a spinal nerve.
intervertebral foramen
The spinal cord is partitioned into an inner ______ matter region and an outer ______ matter region.
gray; white
In the white matter, motor impulses _______ (ascend/descend).
descend
In the white matter, sensory impulses _________ (ascend/descend).
ascend
What are rapid, automatic, involuntary reactions of muscles or glands to a stimulus called?
Reflexes
What is a reflex arc?
The neural wiring of a single reflex.
What composes a reflex arc?
- Receptor in the PNS
- Communicates with the CNS
- Ends at a peripheral effector.