Flashcards in Chapter 9 Deck (43)
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Nerve cells
Neurons
1
3 parts of a neuron
Cell body, dendrites, axon
2
Bundle of axons
Nerve
3
Supporting cells
Neuroglial cells
4
What is each nervous system? 2
Central nervous system-brain and spinal cord
Peripheral nervous system-nerves
5
Name the general functions of nervous system
Sensory function
Integrated function
Motor function
6
Name functions of neuroglial cells
Carry phagocytosis
Provide insulating layers of myelin
Provide structural support and fills spaces
Covers and forms inner linings
Forms myelin sheath
7
Name neurons classification on basis of structure
Bipolar
Unipolar
Multipolar
8
Classification on basis of function
Sensory neuron
Interneuron
Motor neuron
9
Define resting potential
In a resting nerve cell, the potential difference between inside and outside of cell membrane (-70 mv)
10
When resting potential becomes more positive
Depolarized
11
Explain ion movement that makes action potential
@ threshold, NA ions diffuse inward, Depolarizes the membrane
@ same time, K ions diffuse outward, repolarize the membrane
12
Rapid change in potential (+30 mv)
Action potential
13
Wave of action potential
Nerve impulse
14
Differentiate conduct impulses
Un myelinated axons conduct impulses over entire surface
Myelinated axons conduct impulses faster because they jump from node to node
15
Junction between two neurons
Synapse
16
Groups of neurons that make 100s of synaptic connections to perform a common function
Neuronal pools
17
Neuron receives subthreshold stimuli and becomes more excitable to incoming stimuli
Facilitation
18
Differ between convergence and divergence
Convergence-impulses from 2 or more incoming axons may converge on a single neuron
Divergence- impulse from 1 axon that may diverge by passing into several output neurons
19
Simple pathway that includes only a few neurons
Reflex arc
20
What is reflex behavior
Automatic, subconscious responses to changes inside or outside the body
21
Membranes surrounding and protecting brain and spinal cord
Meninges
22
Name the 3 layers in meninges
Dura mater
Arachnoid
Pia mater
23
4 characteristics of spinal cord
31 segments
Cervical enlargement
Lumbar enlargement
Deep anterior groove and shallow posterior grooves extends length of spinal cord
24
Where is the gray and white located in the spine
A central core of gray matter surrounded by white matter
25
Functions of spinal cord
Provides 2-way communication systems between brain and rest of body
Center for spinal reflexes
26
Ridges on the surface
Convolutions (gyri)
27
Shallow groove
Sulcus
28
Deep groove
Fissure
29
