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Chapter 9: Central Nervous System
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21
Physiology
Undergraduate 2
10/16/2013

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Term
Astrocyte
Definition
Glial cell that forms a structural and fucntional link between neurons and non-nervous tissue and extracellular fluid.

Support the blood-brain barrier
Term
Microglia
Definition
Glial cell that protects the central nervous system from foreign matter.

Protects neurons against oxidative-stress.
Term
What are the two outermost structures that protect soft tissues of the CNS?
Definition
Cranium (Surrounds the brain)

Vertebral column (surrounds the spinal cord)
Term
Meninges
Definition
Connective tissue membranes that protect the soft tissue of the CNS from the surrounding bone.
Term
Dura mater
Definition
Outermost layer of the meninges, closest to the bone
Term
Arachnoid mater
Definition
The middle layer of the meninges
Term
Pia mater
Definition
The innermost layer of the meninges
Term
Subarachnoid space
Definition
Space between the arachnoid mater and the pia mater that is filled with CSF
Term
Ventricles
Definition
The brain's four cavities
Term
Blood-brain barrier
Definition
A physical barrier that exists between the blood and the CSF
Term
Gray matter
Definition
Constitutes 40% of the CNS

Site of synaptic communication and neural integration
Term
White matter
Definition
Constitutes 60% of the CNS

Contains myelinated axons
Term
Spinal Cord
Definition
Cylinder of nervous tissue that is continuous with the brain and surrounded by the vertebral column

Extends 2/3's the spinal column's length
Term
Dorsal horn
Definition
Emcompasses the dorsal half of the gray matter

Serves as the connection site for afferent fibers which originate in the periphery.
Term
Reflex
Definition
Automatic patterned response to a sensory stimulus
Term
Reflex arc
Definition
Neural pathway for a reflex consisting of:
1. sensory receptor
2. afferent neuron
3. Integration center
4. Efferent neuron
5. Effector organ
Term
Muscle spindle stretch reflex
Definition
Only monosynaptic reflex in the human body.
Receptor is a muscle spindle that detects the lengthening of the muscle.
Term
Withdrawal reflex
Definition
A response in which the body withdraws from a painful stimulus
Term
Nociceptors
Definition
Receptors that respond to intense stimuli that are damaging to tissue
Term
Crossed-extensor reflex
Definition
A reflex that is initiated simultaneously along with the withdrawal reflex.

Afferent neurons from nociceptors have branches that send signals to efferent neurons controlling muscles on the opposite leg
Term
Motor neurons
Definition
Efferent neurons that originate in the ventral horn of the spinal cord and control skeletal muscles
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