What is the difference between myelinated and unmyelinated nerve fiber?

Myelinated Nerve Fibers: Myelinated nerve fibers are the nerve fibers that are insulated by a myelin sheath, allowing the faster conduction of the action potential along the nerve fiber. Unmyelinated Nerve Fibers: Unmyelinated nerve fibers are the nerve fibers that do not have a myelin sheath.

What is ONH and RNFL?

To evaluate the performance of retinal nerve fiber layer (RNFL) thickness and optic nerve head (ONH) parameters analyzed with different offsets of reference plane in detecting early glaucomatous changes and in correlation with visual function using optical coherence tomography (OCT).

Are retinal nerve Fibres myelinated?

Myelinated retinal nerve fiber layers (MRNF) are retinal nerve fibers anterior to the lamina cribrosa that, unlike normal retinal nerve fibers, have a myelin sheath. Clinically, they appear to be gray-white well-demarcated patches with frayed borders on the anterior surface of the neurosensory retina.

Which of the following is specific for non-myelinated nerve Fibres compared with myelinated nerve fibers?

Autonomic nerves are non-myelinated fibres that lack myelin sheath and carry out slow but smooth conduction of nerve impulse. Thus, the correct answer is option D.

What is the advantage of myelinated nerves over Unmyelinated nerves?

Myelin speeds the conduction of nerve impulses by a factor of 10 compared to unmyelinated fibers of the same diameter. Decreases reaction times to stimuli: Promotes the ability to escape from sudden predatory attack. Promotes the ability to recognize and rapidly react to available prey (Zalc and Colman 2000)

Is myelinated or Unmyelinated faster?

Action potential propagation in myelinated neurons is faster than in unmyelinated neurons because of saltatory conduction.

What is OCT ONH?

OCT indicates optical coherence tomography; ONH, optic nerve head. The Stratus OCT software allows manual adjustment of the optic disc margin reference points and thereby correction of proper disc recognition before topographic disc analysis.

What is an OCT RNFL?

Measuring RNFL with OCT detects subtle differences in glaucoma progression. January 11, 2020. Optical coherence tomography detects abnormalities and progressive thinning of the retinal nerve fiber layer better than measurement of the visual fields.

What nerves are Unmyelinated?

Group C nerve fibers are one of three classes of nerve fiber in the central nervous system (CNS) and peripheral nervous system (PNS). The C group fibers are unmyelinated and have a small diameter and low conduction velocity, whereas Groups A and B are myelinated.

What is true for Unmyelinated nerve fibres?

Explanation: Unmyelinated nerve fibres are enclosed by Schwann cells that do not form a myelin sheath around the axon. They are found in the autonomous and somatic neural system.

What are the differences between Unmyelinated and myelinated axons which conduct action potentials more rapidly Why?

By acting as an electrical insulator, myelin greatly speeds up action potential conduction (Figure 3.14). For example, whereas unmyelinated axon conduction velocities range from about 0.5 to 10 m/s, myelinated axons can conduct at velocities up to 150 m/s.

Why do we need Unmyelinated neurons?

Myelinated neurons are neurons whose axons are surrounded by myelin; the myelin has has an insulating effect and allows the axons to conduct neural impulses faster – but at some metabolic cost, so neurons are not myelinated unless there is a significant advantage to they’re being able to conduct faster.