MMED1005 Lecture Notes - Lecture 5: Abdominal Wall, Oligodendrocyte, Grey Matter
7 Jun 2018
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Main points (learning objectives equivalent)
- Central (CNS) and peripheral nervous system
- General plan of a neuron
- Main structural and cellular features of the nervous system
- Afferent and Efferent nerves
- Functional subdivisions of the efferent nerves
- Functional subdivisions of the Autonomic Nervous System
- Information flow in the nervous system – frequency coding
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The nervous system is divided into:
- Central Nervous System (CNS): brain and spinal cord
- Peripheral Nervous System (PNS): everything else, all bathed in blood plasma
- Dot eoise all this detail. Just ko that the spial od inside the spinal colon
nerves between the vertebrae
Neuron o euoe: nerve cells
- Come in many shapes, but have some common structural features
- There is a cell body that contains the nucleus, and where much of
the biochemical activity takes place – where proteins are synthesised
- Dendrites: processes that extend from the cell body, handle input
o Receive connections from other cells
o Are specialised to act as sensory receptors
o Can be many dendrites
- Axon: the output from the cell
o Only one axon that leaves the cell body, but it may branch
Some nerve fibres are surrounded by a sheath
- The cells that make up the sheath are called Schwann Cells, and they contain a lipid
called myelin
- Schwann cells wrap around the nerve axon many times to give a multi-layered
sheath
- If dendrites are long, they too can be myelinated.
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Document Summary
Main structural and cellular features of the nervous system. Functional subdivisions of the autonomic nervous system. Information flow in the nervous system frequency coding. Central nervous system (cns): brain and spinal cord. Peripheral nervous system (pns): everything else, all bathed in blood plasma. Just k(cid:374)o(cid:449) that the spi(cid:374)al (cid:272)o(cid:396)d inside the spinal colon nerves between the vertebrae. Come in many shapes, but have some common structural features. There is a cell body that contains the nucleus, and where much of the biochemical activity takes place where proteins are synthesised. Dendrites: processes that extend from the cell body, handle input: receive connections from other cells, are specialised to act as sensory receptors, can be many dendrites. Axon: the output from the cell: only one axon that leaves the cell body, but it may branch. Some nerve fibres are surrounded by a sheath. The cells that make up the sheath are called schwann cells, and they contain a lipid called myelin.
