These are known as non-medullated axons and they have a gray instead of a white color.    From Wordnik.com.  [Physiology and Hygiene for Secondary Schools] Reference

Tuczek and Fuchs have confirmed the discoveries of Exner, that there are no medullated nerve fibers in the convolutions of the infant, and.    From Wordnik.com.  [Scientific American Supplement, No. 520, December 19, 1885] Reference

B, a medullated nerve fiber at a node or constriction of Ranvier, the axis cylinder passes uninterruptedly from one segment into the other, but the medullary sheath is interrupted.    From Wordnik.com.  [A Practical Physiology] Reference

R., the nodes of Ranvier. n.m.f., a non-medullated fibre.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

Diagram of longitudinal sections of medullated nerve fibers.    From Wordnik.com.  [Illustrations. Fig. 631] Reference

There is, however, in these nerves a certain admixture of medullated fibers.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

The nerves are derived from the celiac plexus and are chiefly non-medullated.    From Wordnik.com.  [XI. Splanchnology. 4g. The Spleen] Reference

They are of two kinds—viz., medullated or white fibers, and non-medullated or gray fibers.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

The nerve fibres of this system, like the nerve fibres of invertebrates, are non-medullated.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

The individual fibers vary in size, generally averaging about half the size of the medullated fibers.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

In external appearance the non-medullated nerve fibers are semitransparent and gray or yellowish gray.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

These sensations are carried by medullated nerve fibres, and are slow to return after injury to the nerves.    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference

The white substance consists of medullated fibers, varying in size, and arranged in bundles separated by neuroglia.    From Wordnik.com.  [IX. Neurology. 4c. The Fore-brain or Prosencephalon] Reference

In addition to these medullated fibers there are great numbers of non-medullated fibers which enter with the lateral bundle.    From Wordnik.com.  [IX. Neurology. 3. The Spinal Cord or Medulla Spinalis] Reference

A small nervous branch from the sympathetic of a mammal.a. Two medullated nerve fibers among a number of gray nerve fibers, b.    From Wordnik.com.  [Illustrations. Fig. 635] Reference

This portion of the gland is richly supplied with non-medullated nerve fibers, and here and there sympathetic ganglia are found.    From Wordnik.com.  [XI. Splanchnology. 1F. The Chromaphil and Cortical Systems] Reference

It is about an inch and a quarter long, and is composed of both medullated and unmedullated fibers -- that is of both "white" and.    From Wordnik.com.  [The Mind and Its Education] Reference

These nuclei are believed to be in connection with a delicate sheath corresponding with the neurolemma of the medullated nerve fiber.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

In the unstriped or involuntary muscles the nerves are derived from the sympathetic, and are composed mainly of non-medullated fibers.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

The cerebrospinal nerves consist almost exclusively of medullated nerve fibers, only a very small proportion of non-medullated being present.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

Ransom118 suggests that these non-medullated fibers and the substantia gelatinosa are concerned with the reflexes associated with pain impulses.    From Wordnik.com.  [IX. Neurology. 3. The Spinal Cord or Medulla Spinalis] Reference

The primitive sheath is not present in all medullated nerve fibers, being absent in those fibers which are found in the brain and medulla spinalis.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

The fibres concerned are non-medullated and regenerate comparatively quickly after injury, so that protopathic sensibility is regained before epicritic.    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference

Horsley has demonstrated certain medullated fibers running in the epineurium and terminating in small spheroidal tactile corpuscles or end bulbs of Krause.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

The brain was macroscopically normal, but showed superficial gliosis (frontal and precentral) and thinning out of medullated fibers superficially (frontal).    From Wordnik.com.  [The Journal of Abnormal Psychology] Reference

The nerves of the bladder are (1) fine medullated fibers from the third and fourth sacral nerves, and (2) non-medullated fibers from the hypogastric plexus.    From Wordnik.com.  [XI. Splanchnology. 3b. 3. The Urinary Bladder] Reference

In the striped or voluntary muscle the nerves supplying the muscular fibers are derived from the cerebrospinal nerves, and are composed mainly of medullated fibers.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

Fine non-medullated nerve fibers, vasomotor fibers, accompany these capillary vessels, and break up into elementary fibrils, which form a network around the vessels.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

In addition the fasciculus or tract of Lissauer contains great numbers of fine non-medullated fibers derived mostly from the dorsal roots but partly endogenous in origin.    From Wordnik.com.  [IX. Neurology. 3. The Spinal Cord or Medulla Spinalis] Reference

Medullation of the fibers of the sensory root begins about the fifth month of fetal life, but the whole of its fibers are not medullated until the third month after birth.    From Wordnik.com.  [IX. Neurology. 5e. The Trigeminal Nerve] Reference

632– Transverse sections of medullated nerve fibers.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

N., nucleus of a medullated nerve. a.c., its axis fibre.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

631– Diagram of longitudinal sections of medullated nerve fibers.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

635– A small nervous branch from the sympathetic of a mammal.a. Two medullated nerve fibers among a number of gray nerve fibers, b.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference

There is always a grey axis cylinder (a.c.), which may (in medullated nerves), or may not (in non-medullated or grey nerves) have a medullary sheath (s.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

Transverse sections of medullated nerve fibers.    From Wordnik.com.  [Illustrations. Fig. 632] Reference

Non-medullated Fibers.    From Wordnik.com.  [IX. Neurology. 1. Structure of the Nervous System] Reference