Nervous System Flashcards
What are the 2 structural divisions of the nervous system?
- CNS
2. PNS
What does the CNS consist of?
Brain and spinal cord
What is the functional unit of the nervous system?
The neuron
List the major components of a neuron
Dendrite, cell body, nucleus, axon, myelin, nodes of Ranvier
What are the 3 principle functions of the nervous system?
- Sensory input
- Integration
- Sensory output
Which division is the afferent?
Sensory division
Which division is the efferent?
Motor division
What are the 2 divisions of the motor division?
- Somatic
2. Autonomic
What are the 2 divisions of the autonomic nervous system?
- Sympathetic
2. Para-sympathetic
What surrounds the nerve cells?
Glial cells
What are the general functions of glial cells?
Provide support, nutrition, insulation and help with signal transmission
What are the 4 glial cells of the CNS?
- Astrocytes
- Microglial cells
- Ependymal cells
- Oligodendrocytes
Functions of Astrocytes
Regulate ions, exchange materials between neurons and capillaries
Functions of Microglial cells
Immune Defense against invading microbes
Functions of Ependymal cells
Line cavities in the brain and spinal cord. Create, secrete and circulate cerebrospinal fluid