The Nervous System - Lecture 1

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What two systems make up the Nervous System?

The Central Nervous System and The Peripheral System

What two body parts make up the The Central Nervous System?

The Brain and the Spinal Cord

What two body parts and one system make up the The Peripheral System?

Cranial & Spinal Nerves, Visceral Afferent, Automatic Nervous System

What two nerves make up the Automatic Nervous System?

Sympathetic and Parasympathetic

The organization of the Nervous System is...

within the body.

Inside is you brain and you spinal cord but outside is your...

peripheral nervous system

How many nerves are there is the peripheral nervous system?

12 cranial nerves and the spinal column

What is the basic nervous system made up of?

Neurons

What is a neuron?

The most basic functional unit and are the small part of the nervous system.

What is the main bulk of the neuron?

The Cell body

What are Dendrites?

Little extensions off the cell body.

What is the longer extension off the neuron called?

the axon

What is the axon wrapped up in?

Myelin

What is in between the gaps of myelin?

Nodes of ranvier

Where are the axon terminals?

At the very end of the axon

What are the two groups of neurons called in the Nervous System called?

Somatic Neurons and Autonomic Neurons

Somatic Neurons are _________ in the environment.

observable

What kind of activities are the Somatic Neurons involved in?

Voluntary

What is an example of a voluntary activity?

your arms moves because you tell it to

What kind of activities are the Autonomic Neurons involved in?

involuntary

What are examples of involuntary activities?

process that occurs in the viscera or the blood vessels, the glands, all the unconscious activities

What are the three different ways a neurons can travel?

efferent, afferent, both(meaning a mix of afferent and efferent)

Efferent

conduct impulses away from the cell body or from the central nervous system; think eeeeehh! I'm scared and I'm running away!

Afferent

conduct impulses toward the neuron cell body or toward the central nervous system; think "I want Affection, so I coming to you!"

What are the dendrites? Afferent or Efferent

afferent

The dendrites help move the info. _________ the central nervous system.

towards

What are the axons? Afferent or Efferent

efferent

The axons help move the info ___________ from the central nervous system.

away

What is the myelin's purpose?

lines nerves fibers to protect and insulate; helps transmission of electrical current carrying data from on nerve cell to the next so it can speed it up.

What is the Nodes of Ranvier's Purpose?

junctions where the nerve process is exposed, increase velocity of nerve impulses

What is the Myelin like on a first born baby?

the myelin has not completely covered the axon

What happens to the myeline on the axon as a child learns a skill.

the myelin will form to help them accomplish that skill faster and faster so the nerve with learn how to accomplish that task

Most Myelations of the nerve fibers won't occur until...

late childhood

What happens to the myeline if a person gets Multiple Sclerosis?

The myelin gets damaged and depending on where the damage is, a person will have certain problems and lose the speed different skills

What are Synapes?

the space between neurons in a chain, neurons will start linking together to form chains

What happens as neurons start linking together?

an axon will come down to form synaptic knob

What is inside a synaptic knob?

there is a bunch of synaptic vesicles and mitochondria

What is a synaptic cleft?

the gap in between the neurons as they start linking together

What happens as the synaptic cleft hooks onto the next neuron?

it will send forth vesicles releasing neurotransmitters to continue sending message from one nerve to next nerve

What happens when all the nerves have connected together?

a group of bundle of axons and/or dendrites from numerous neurons form nerves

What are Sensory Nerves?

afferent, moving toward the central nervous system

What are Motor Nerves?

efferent, they're taking info. from central nervous system

What are Mixed Nerves?

have both afferent and efferent purposes

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