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The axon of a nerve cell is covered by a...

The axon of a nerve cell is covered by a sheath called

A

Epineurium

B

Medulla

C

Myelin sheath

D

Neurilemma

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Neurons**: Neurons are the specialized cells of the nervous system that are responsible for transmitting nerve impulses. They consist of three main parts: the cell body, dendrites, and axon. 2. **Identifying the Axon**: The axon is the part of the neuron that conducts nerve impulses away from the cell body. It is essential for the transmission of signals in the nervous system. 3. **Covering of the Axon**: The axon is covered by a protective sheath. This sheath is crucial for the proper functioning of the axon as it helps in the conduction of nerve impulses. 4. **Naming the Sheath**: The covering of the axon is known as the "myelin sheath." This sheath is composed of layers of plasma membrane from glial cells that insulate the axon, facilitating faster transmission of electrical signals. 5. **Conclusion**: Therefore, the axon of a nerve cell is covered by a sheath called the myelin sheath. **Final Answer**: The axon of a nerve cell is covered by a sheath called the myelin sheath. ---
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Fill in the blanks : (i) The nervous control is "………………" and flexible while hermonal control is usually "………………" and its effect is diffuse. (ii) Nervous tissue consits of "………………" , nerve fibres, nerves, packing cells called neuroglia, ependymal cells and "………………" . (iii) Each nerve fibre is covered by a layer of connective tissue called "………………" . Similarly , each nerve is surrounded by a dense layer of connective tissue called "………………" . (iv) The surface of the cerebrum is greatly folde to increase the area for accomodatingmore nerve cells. The folds are called "………………" and the depressions between them are termed "………………" . (v) Anterior choroid plexus is found in "………………" while durameter is the "………………" meninx of the brain . (vi) Pia meter is the "………………" meninx of the brain while durameter is the "………………" meninx of the brain. (vii) In spinal cord, grey matter is "………………" and white matter is "………………" in position and is divided into three columns. (viii) In amniotes there are "………………" cranial nerves while in anamniotes there are "………………" cranial nerves. (ix) Spinal nerves are always "………………" in nature . In man, there are "………………" pairs of the spinal nerves. (x) Cerebellum consists of a pair of "………………" and a median "………………" .

Spot the mistakes in the given statements and correct them. a) Medullated nerve cells are enclosed by Myclin sheath. b) Nont - Medullated nerve cells are enclosed by Myelin sheath,

Knowledge Check

  • Which part of neuron is covered by fatty sheath ?

    A
    Axon
    B
    Cyton
    C
    Dendrite
    D
    Node of Ranvier.

  • In maize seed the plumule is enclosed by a sheath called as

    A
    Testa
    B
    Tegmen
    C
    Coleoptile
    D
    Coleorhiza

  • The plwnule is covered by protective sheath called:

    A
    Coleorhiza
    B
    Scutellum
    C
    Coleoptile
    D
    Tegmen

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    A neuron is a microscopic structure composed of three major parts, namely, cell body, dendrites and axon. There are two types of axons, namely, myelinated, and nonmyelinated. Which of the following is true for nerve ? i. The myelinated nerve fibres are enveloped with Schwann cells ii. Schwann cells form a myelin sheath around the axom iii. The gaps between two adjacent myelin sheaths are called nodes of Ranvier. iv.Myelinated nerve fibres are found in autonomous and the somatic neural systems v. Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon. vi. Unmyelinated nerve fibre is commonly found in spinal and cranial nerves

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