Lecture notes

The Nervous System class notes

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Module
The Nervous System Class Notes

Institution
Sheffield Hallam University (SHU)

Full detail class notes on The Nervous system! Everything you could need to know to pass this section of the exam. I've included diagram pictures, definitions and organised sections. I recommend using these notes alongside a revision tactic such as flashcards or a mind map :) I included some wa...

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Uploaded on August 8, 2023
Number of pages 8
Written in 2023/2024
Type Lecture notes
Professor(s) Dr kirsti newton
Contains All classes

The Nervous System – Class Notes

What is the Nervous system?
 Works with the Endocrine system to maintain an ideal internal
environment.
 Transmits electrical impulses known as action potentials, across
neurons.

How to Remember the order of a response:
S = Stimuli
R = Receptor
S = Sensory Neuron
R = Relay Neuron
M = Motor Neuron
E = Effector
R = Response

Chant “S R S R M E R”

CNS  Brain & Spinal Cord
Nervous system 
PNS  Cranial and Spinal Nerves & Sensory Organs

Neuroglia: Support, nourish and protect neurons whilst maintaining
interstitial fluid (Interstitial fluid bathes the neurons)

, Neurons are NOT nerves!!!!!  REMEMBER

Nerve = A bundle of neurons
Neuron = A specialized cell in the nervous system

Structure of a Neuron:
Axon

Dendrites

Cell body

Cell Body = Contains the cells organelles (Mitochondria, Ribosomes, RER
and Nucleus)
Dendrites = Receive Info from other neurons
Axon = Capable of creating an electrical impulse (Action Potential).
Contains axoplasm and no ribosomes so no protein is made
Collaterals = Branches of the axon
Telodendria = Where axon and collaterals end

Myelin Sheath:
 Layer covering the axon
 Produced by neuroglia cells (Oligodendrocytes & Schwann)
 Insulates axon increasing speed of conduction
 Nodes of Ranvier = Gaps in myelin sheath

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