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Encyclopedia Britannica - Main :: FAT-FLA |
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FIBRES may be medullated or non-medullated, but, whichever they are, they consist of the long process or axon of a nerve cell; in anon-medullated nerve this process is either naked or enclosed in adelicate membrane called the primitive sheath or neurilemma, but in a medullated nerve the process or axis
white
fatty substance called myelin, and so the term
often used instead of " medullated " for these nerves (see fig. 1). Axis
white
cylinder present in most nerves, but is lost when they are massed to form the white matter of the central nervous
system
Myelin At regular
Primitive bundles called funiculi, enclosed in a connective sheath tissue sheath, the perineurium, and separated from it by a lymph space. From this sheath delicate processes penetrate among the fibres, and these are known as the endoneurium. The funiculi are collected into bundles called fascicuti, and the whole nerve consists of a variable number of fasciculi surrounded by a dense fibrous sheath, the epineurium. The various bundles do not remain distinct, but break up and re-arrange themselves, so that following them up with the scalpel is a difficult and tedious work
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