The cellular unit of the nervous system is the neuron. What is the major function of this cell type.

Transmitting messages from one place to another.

The supporting cells, or neuroglia, have numerous functions

Myelination,macrophages, protection, anchoring neuron in place.

The brain & spinal cord collectively

CNS

Junction or point of close contact between neurons.

Synapse

A bundle of nerve processes outside the CNS.

Association neuron or interneuron

Spinal & cranial nerves & ganglia.

PNS

Collection of nerve cell bodies inside the CNS.

Nuclei

Collections of nerve cell bodies outside the CNS or PNS.

Ganglia

Neuron that conducts impulses away from the CNS to muscles and glands

Efferent (Motor)

Neuron that conducts impulses toward the CNS from the body periphery

Afferent (Sensory)

Chemicals released by axonal terminals

Neurotransmitters

How is one-way conduction at synapes ensured?

Axons only carry impulses in one direction

Describe how the Schwann cells form the myelin sheath and the neurilemma encasing the nerve processes.

Wraps around axon without crushing it. (Jellyroll style)

Reversal of the resting potential owing to an influx of sodium ions.

Depolarization

Period during which potassium ions are diffusing out of the neuron.

Repolarization

Transmission of the depolarization wave along the neuronal membrane

Action potential

Mechanism that restores the resting membrane voltage and intracellular ionic concentrations

Sodium potassium pump

Would a substance that decreases membrane permeability to sodium increase or decrease the probability of generating a nerve impulse?

Decrease

Why don't the terms depolarization & action potential mean the same thing?

Depolarization is at sub threshold amount, small change in charge. Action potential is at full threshold, large change in charge.

Which of the following structures are NOT a part of the brain stem?

Cerebral Hemispheres
Pons
Midbrain
Cerebellum
Medulla

Cerebral Hemispheres, Cerebellum

Elevated ridge of cerebral tissue

Gyrus

Inward folds of cerebral tissue

Sulci, fissures

Most important autonomic center of the brain

Medulla Oblongata

Coordinates complex muscular movements

Cerebellum

Contains autonomic centers regulating heart rate,respiration, and other visceral activities

Medulla

Large fiber tractconnecting the cerebral hemisphers

Corpus Collosum

Part of the endocrine system

Pituitary Gland, Pinal Body

The intermediate mass is part of it

Thalmus

Why would trama to the base of the brain be dangerous.

Injury to the Medulla will cause problem with heart rate and breathing.

The outermost (and toughest) of the 3 meninges.

Dura Mater

Innermost vascular layer covering the brain; follows every convolution of the 3 meninges.

Pia

The middle element of the meninges named because of its spider web-like appearance. ...

Arachnoid

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