How is the nervous system organised?
What is the function of the CNS and PNS?
How are neurons classified?
What are the structural components of a neuron?
What are glial cells?
How are the cell bodies of neurons protected?
Why do cell bodies have to be protected?
In what direction does a nerve impulse travel?
What is an axon terminal and what is its function?
The nervous system is organised into 2 systems:
ReplyDelete- The Central Nervous System (CNS)
- The Perihperal Nervous System (PNS)
CNS
- Brain & Spinal Cord
- Is the intergration and command centre
PNS
- 31 paired spinal and 12 cranial nerves
- Carries message to and from the spinal cord and brain (both sensory and motor)
Good start Renae, however you need to specify a little more detail re: PNS. Can anyone help?
ReplyDeleteI think I know what I left out..
ReplyDeletePNS:
Efferent/Motor Nerves can be further subdivided into the Autonomic Nervous System (ANS) and the Somatic Nervous System (SNS).
SNS: (Conscious Control)
Includes innervation to skeletal muscles, which is consciously controlled. Eg. When we kick a ball using the muscles in our legs.
ANS: (Subconscious Control)
Innervation to cardiac muscles, capillaries and glands, which is subconsciously controlled. [Usually by the cerebellum]. Eg. Our heart beats without our knowledge.
ANS can be subdivided into two groups the parasympathetic and sympathetic nervous system.
Parasympathetic - Leads to normal levels of heart and blood rate, and increased levels of digestion and secretion.
Sympathetic - "flight-or-fight" response. Causes increased heart and blood rate, and decreased digestion and excretions. Clinically results in dry mouth and anxiety.