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Flashcards in midterm 1 Deck (22):
1

The nervous system is made up of

the brain, spinal cord, and nerves

2

Central Nervous System (CNS)

Structural and functional center of the entire nervous system; Consist of the brain and spinal cord

3

Peripheral Nervous System (PNS)

All the nerves and their branches; cranial and spinal nerves

4

Somatic Nervous system (SNS)

carry information to the somatic effectors (skeletal muscles)

5

Autonomic Nervous System (ANS)

carry information to the autonomic or visceral effectors (smooth muscles, cardiac muscles and glands)

6

Somatic Effectors

Skeletal muscles

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Efferent pathways of the ANS can be divided into the

Sympathetic division and the parasympathetic division

8

Glia cells

Support the neurons

9

Five major types of glia

1)Astrocytes 2)Microglia 3)Epedymal cells 4)Oligodendrocytes 5)Schwann cells

10

Oligodendrocytes produce

produce the fatty myelin sheath around nerve fibers in the central nervous system

11

Schwann cells support

support nerve fibers and sometimes forming a myelin sheath around them

12

Multiple Sclerosis (MS)

myelin disorders; characterized by myelin loss and destruction accompanied by varying degrees of oligodendrocytes injury and death.

13

All nuerons consists

consists of a cell body and at least two processes; one axon and one or more dendrites

14

Nuerons -structural classification

1)Multipolar 2)Bipolar 3)Unipolar

15

Multipolar Nuerons

have only one axon but several dendrites; most in the brain and spinal cord are multipolar

16

Bipolar Nuerons

have only one axon and one highly branched dendrite; neuron w/ exactly two extensions from the cells body

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Unipolar (pseudounipolar) neurons

have a single process extending from the cell body; neuron with only one extension from the cell body. the central process is an axon; the peripheral process is a modified axon w/ branched dendrites at its extremity

18

Nuerons - functional classification

1) afferent nuerons 2)efferent nuerons 3)internuerons

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Afferent Nuerons

Sensory nuerons; transmit nerve impulses to the spinal cord or brain

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Efferent Nuerons

Motor nuerons; transmit nerve impulses away from the brain or spinal cord to or toward muscles or glands

21

Internuerons

conduct impulses from afferent nuerons to or toward efferent /motor nuerons

22

Functional classification of nuerons in a reflex arc

Nuerons can be classified according to the direction in which they conduct impulses; Stimulus -Receptor- Afferent - CNS- internueron- efferent - effector -response