Nervous System: Central and Peripheral Systems | A-level Biology | OCR, AQA, Edexcel

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The key points covered of this video include:

1. The Central Nervous System
2. The Peripheral Nervous System
3. Features of the CNS and PNS

The Central Nervous System

The nervous system is what we call the network made of all the neurones in the body. It can be divided up into two main parts. It can be divided up into two main parts: the central and the peripheral nervous systems. The central nervous system (or CNS) is mostly made up of relay or intermediate neurones. These are mostly neurones which only have connections with other neurones. The central nervous system makes up the brain and the spinal cord. The central nervous system is the central part of the nervous system, composed of the brain and spinal cord.

The Peripheral Nervous System

The peripheral nervous system (PNS) acts as the interface between the CNS and the environment. The PNS is made up of motor and sensory neurones. These neurones connect the CNS to receptors and effectors. The peripheral nervous system is made of sensory and motor nerves connecting the sensory receptors and effectors to the CNS.

Features of the CNS and PNS

Many nerves in the CNS are unmyelinated. These make up grey matter in the brain and spinal cord. There are also myelinated neurones in the CNS. These make up the white matter of the brain and spinal cord. The CNS is protected by the spine and the skull. The PNS also contains lots of myelinated neurones, which bundle together to form nerves.

Summary

The central nervous system mostly contains relay neurones
It is made up of the brain and spinal cord
The peripheral nervous system carries signals to and from the CNS
It is made up of sensory and motor neurones
Myelinated nuerones make up the white mater in the CNS
Unmyelinated neurones make up the grey matter in the CNS
Neurones in the PNS bundle together into nerves

[itsbernice]

3:12 May I clarify if this should be "motor out" instead of "sensory out"?

[snowplengpin]

Hello, do you have a video that explains each of the different neurones?

Thank you so much!