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Flashcards in Nervous System Deck (35):
1

Nervous System

The master controlling and communicating system of the body.

2

Sensory input

Gathered information

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Integration

makes decisions about what should be done at each moment.

4

Central nervous system

the brain, and spinal cord which occupy the dorsal body cavity.

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Peripheral nervous system

the part of the nervous system outside the CNS. mainly consists of the nerves leaving the brain.

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afferent

consists of nerve fibers that convey impulses to the CNS from sensory receptors.

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efferent

carries impulses from the CNS to the effector organs the muscles and the glands.

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somatic nerve system

allows us to consciously control our skeletal muscles.

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Automatic Nervous system

regulates events that are automatic or involentary.

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neuroglia

cells that generally support, isulate, and protect the deicate neurons.

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Astrocytes

star shaped cells that account for nearly half of the neural tissue.

12

Microglials

spiderlike phagocytes that dispose of debris including dead brain cells, and bacteria.

13

ependymal cells

these line the cavities of the brain and spinal cord.

14

oligodendrocytes

wrap their flat extensions tightly around the nerve fibers.

15

Schwann cells

Axons outside the CNS

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satellite cells

are precursors to skeletal muscle cell.

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neurons

a specialized cell transmitting nerve impulses; a nerve cell.

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dendrites

generate nerve impulses.

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axons

conducts nerve cells away from the body

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axon hillock

coneike region of the cell body.

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axon terminals

contain hundreds of tiny vessels.

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myelin

fibers convered with fatty material

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myelin sheath

tight coil wrapped membranes.

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nodes of Ranvier

gaps in schwann cells.

25

depolarization

As the sodium rushes back into the cell the positive sodium ions raise the charge inside of the cell from negative to positive

26

action potential

is a short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a consistent trajectory.

27

repolarization

refers to the change in membrane potential that returns it to a negative value

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cerebrum

anterior part of the skull.

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parietal lobe

The parietal lobe is positioned above the occipital lobe

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frontal lobe

at the front of the brain,

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occipital lobe

is the visual processing center

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temporal lobe

is located beneath the lateral fissure

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gray matter

the darker tissue of the brain and spinal cord,

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cerebral white matter

lighter tissue of the brain

35

cerebellum

the part of the brain at the back of the skull in vertebrates. Its function is to coordinate and regulate muscular activity.