Nervous System and Nervous Cells Flashcards
1
Q
What is the structure of the nervous system?
A
1). Central =
- brain
- spinal cord.
2). Peripheral =
- somatic.
- autonomic.
3). Autonomic =
- sympathetic.
- parasympathetic.
2
Q
How many pairs of cranial nerves are in the PNS?
A
12.
3
Q
How many pairs of spinal nerves are in the PNS?
A
31.
4
Q
What is a neuron?
A
The cells that carry messages as electrical impulses –> allowing rapid communication.
5
Q
What is the structure of a neuron?
A
- Dendrites
- Nucleus (containing DNA)
- Cell body
- Axon
- Schwann cell (Myelin Sheath)
- Nodes of ranvier
- Axon terminals
- Synaptic vesicle
- Synaptic cleft.
6
Q
What forms the myelin sheath in the PNS?
A
Oligodendrocytes
7
Q
What does the cell body contain?
A
- Nucleus.
- Cytoplasm.
- Other organelles.
8
Q
What is the difference between neurons and nerve cells?
A
1) . Nerve = A collection of nerve axons.
2) . Neuron = One cell.
