CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Spinal Nerves

Constrictions...

Question

Constrictions at intervals in a nerve fibre are known as

A

Nodes of Ranvier

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

Nodes of schwann

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

Dorsal fissure

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

Ventral fissure

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A
Nodes of Ranvier

Nodes of Ranvier, also known as myelin sheath gaps, are periodic gaps in the insulating myelin sheaths of myelinated axons where the axonal membrane is exposed to the extracellular space.

Suggest Corrections

thumbs-up

0

Similar questions

Q. Consider the following statements and find out coorect option:
(a) Three are two types of axons, namely myelinated and non myelinated
(b) Myelinated nerve fibres found in autonomous and the somatic neural systems
(c) The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(d) The gap between two adjacent myelin sheaths are calleds nodes of Ranvier.
(e) Unmyelinated nerve fibre found in spinal and cranial nerves
(f) Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon.

Q. Assertion :Non-myelinated nerve fibres do not possess nodes of Ranvier. Reason: This is due to the absence of nissl's bodies in node of Ranvier.

Q. Saltatory conduction is associated with those nerve fibres that have nodes of Ranvier.

Q. Read the following statements:
(i) Saltatory type of present in non-myelinated nerve fibres (axons) only
(ii) The nerve impulse generated at a point in the neuron faes resistances at sites where myelin sheath is present
(iii) Nodes of Ranvier of axon is exposed to ECF
(iv) In myelinated neurons, ion channels and transport pumps are absent in the nodes of Ranvier
(v) In myelinated nerve fibre, the nerve impulse travel as a continous wave of depolarisation
How many of the statements are correct?

Q. Schwann cells and nodes of Ranvier are found in

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Peripheral Nervous System

BIOLOGY

Watch in App

explore_more_icon

Explore more

Standard X Biology

Join BYJU'S Learning Program

CrossIcon