Nervous System Part 1

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1

Central Nervous System

One of two major branches of the nervous system. Main organs: Brain and Spinal Cord

2

Peripheral Nervous System

One of two major branches of the nervous system. Main organs: sensory receptors and ganglia

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Somatic Nervous System

Part of the peripheral nervous system. Things you consciously control

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Autonomic Nervous System

Part of the peripheral nervous system. Things that are involuntary

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Sympathetic nervous system

Part of the autonomic nervous system. Fight or flight mode. Uses adrenaline

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Parasympathetic nervous system

Part of the autonomic nervous system. Rest and digest

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Cerebrospinal Fluid

A layer of protection of the nervous system. Liquid that acts like a cushion. Made in the ventricles

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Meninges

A layer of protection of the nervous system. Membranes that cover the brain and spinal cord. Three types.

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Bone

A layer of protection of the nervous system.

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Dura Mater

The outermost meninge. Tough mother

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Arachnoid

The middle meninge. Looks like a spider web

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Pia mater

The innermost meninge. Delicate mother. The layer that is actually on the surface of the brain and spinal cord.

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Neuron

Nerve cell.

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Neuroglial cells

Support cells that make up 90% of the brain and spinal cord.

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Axon

The tail of a neuron. It carries an impulse away from the cell body.

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Dendrite

The parts of the neuron that brings information to the cell body. Neurons have multiple dendrites.

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Cell body

The major part of the neuron that does the processing. It can't divide.

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Schwann cells

Neuroglial cells that wrap around the axon. This allows for saltatory conduction

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Node of Ranvier

The gap between schwann cells on a myelinated neuron.

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Saltatory Conduction

The process where an impulse jumps from one node of ranvier to the other to send an impulse quickly

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Myelinated fibers

Neurons that have schwann cells. White matter of the brain

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Unmyelinated fibers

Neurons that lack schwann cells. Gray matter of the brain.

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The functions of the nervous system

Sensory, Integrative, and Motor