Definition of Medullary sheath

1. Noun. A layer of myelin encasing (and insulating) the axons of medullated nerve fibers.


Medical Definition of Medullary sheath

1. An insulating layer surrounding vertebrate peripheral neurons, that dramatically increases the speed of conduction. It is formed by specialised Schwann cells, that can wrap around neurons up to 50 times. The exposed areas are called nodes of Ranvier: they contain very high densities of sodium channels and action potentials jump from one node to the next, without involving the intermediate axon, a process known as saltatory conduction. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Medullary Sheath

medullary chemoreceptor
medullary cone
medullary cords
medullary cystic disease
medullary cystic kidney disease
medullary folds
medullary groove
medullary laminae of thalamus
medullary layers of thalamus
medullary membrane
medullary nephrocalcinosis
medullary plate
medullary pyramid
medullary ray
medullary sarcoma
medullary sheath (current term)
medullary space
medullary spinal arteries
medullary sponge kidney
medullary stria of thalamus
medullary striae of fourth ventricle
medullary substance
medullary teniae
medullary tube
medullas
medullate
medullated
medullated nerve fiber
medullated nerve fibre
medullation

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