Notes for C3.1.8 Nerves as bundles of nerve fibres of both sensory and motor neurons - IB | RevisionDojo
C3.1.8 Nerves as bundles of nerve fibres of both sensory and motor neurons Notes
Nerves Are Bundles of Fibers That Transmit Signals Across the Body
These fibers are the long extensions of neurons, the cells responsible for communication in the nervous system.
Definition
Nerve
A bundle of axons that transmits electrical signals between the CNS and the body.
Structure of a nerveTip
Remember: Epineurium is the outermost layer, like the epidermis of your skin.
Myelinated vs. Unmyelinated Nerve Fibers
Myelinated Fibers
Wrapped in a myelin sheath, which acts as an insulator.
Enables rapid signal transmission through saltatory conduction.
Unmyelinated Fibers
Lack a myelin sheath.
Transmit signals more slowly.
Myelin sheath
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Tip
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Questions
Recap questions
1 of 5
Question 1
Recap question
In a myelinated axon, conduction velocity (v) scales approximately with axon radius (r) according to v∝r. If you double the radius of a myelinated axon, what happens to its conduction velocity?
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Note
Introduction to Nerves
Nerves are bundles of nerve fibers that transmit electrical signals between the brain, spinal cord, and the rest of the body.
These fibers are the long extensions of neurons, the cells responsible for communication in the nervous system.
DefinitionNerveA bundle of axons that transmits electrical signals between the CNS and the body.
AnalogyThink of nerves like cables containing many wires, each wire carrying a specific signal.
