2007-03-15 23:14:08 · 5 answers · asked by elston h 1 in Science & Mathematics ➔ Medicine
From dictionary.com:
The acquisition, development, or formation of a myelin sheath around a nerve fiber.
Myelin:
A whitish, fatty substance that forms a sheath around many vertebrate nerve fibers. Myelin insulates the nerves and permits the rapid transmission of nerve impulses. The white matter of the brain is composed of nerve fibers covered in myelin.
2007-03-15 23:18:33 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Myelinated nerve cells - have a fatty sheath around it. The myelin is not around the whole cell (think of the twists in a sausage) the breaks (or little twisted bits with no meat) are the nodes, and the myelinated sections (the actual sausage part). Local current must travel from node to node (jump) which causes the current to be faster than in non-myelinated nerve cells. The diameter of the cell also contributes to the speed of transmission.
2007-03-18 03:24:12 · answer #2 · answered by Nicole 1 · 0⤊ 0⤋
There are two sorts of nerve
The first without myelin
The second have a layer of grease around the axon. In these nerves the nervous conduction is more quicker.
If you have a disease Called multiple sclerosis the myelin vanishes and you have severe impairments
2007-03-16 06:22:00 · answer #3 · answered by maussy 7 · 0⤊ 0⤋
(m)
myelination The second of two changes during brain development after birth; the process during which neurons and dendrites become coated with a fatty substance (myelin) to enable neural impulses to travel faster.
2007-03-16 06:19:03 · answer #4 · answered by mallimalar_2000 7 · 2⤊ 0⤋
formation of a whitish fatty substance forming a sheath around nerve fibres is called myelination
all the best
2007-03-16 10:10:32 · answer #5 · answered by vinay m 1 · 0⤊ 0⤋