Question

Column A Column B a. Astrocyte b. Axon c. Collateral d. Dendrite e. Myelin f. Neurilemma g. Neurofibrils h. Nissl bodies (chromatophilic substance) i. Unipolar neuron Laboratory Assessment 17 _______ 1. Sheath of Schwann cell containing cytoplasm and nucleus that encloses myelin _______ 2. Corresponds to rough endoplasmic reticulum in other cells _______ 3. Network of threadlike structures within cell body and extending into axon _______ 4. Substance of Schwann cell composed of lipoprotein that insulates axons and increases impulse speed _______ 5. Neuron process with many branches that conducts an action potential (impulse) toward the cell body _______ 6. Branch of an axon _______ 7. Star-shaped neuroglia between neurons and blood vessels _______ 8. Nerve fiber arising from a slight elevation of the cell body that conducts an action potential (impulse) away from the cell body _______ 9. Possesses a single process from the cell body

Answer 1

Answer:

1.) neurilemma (option f)

2.) nissil bodies (chromatiophillic substance)

3.) neurofibrilis ( option g)

4.) myelin ( option e)

5.) dendrite ( option d)

6.) collateral ( option c)

7.) astrocytes (option a)

8.) axon ( option b)

9.) Unipolar neuron (option i)

Explanation:

The neurological terms described above are different parts of a nerve cell or neurones. The nerve cells are the basic Structural units of the nervous system. They are highly specialised for transmitting electric impulses. They can also be grouped according to the number of processes they possess, for example, the UNIPOLAR NEURONS( those with one process only). Each neuron, however, is composed of the same basic parts which include:

--> The CELL BODY: they may be angular or oval in shape with a large nucleus and dense granulated cytoplasm. In the cytoplasm, rough Endoplasmic reticulum which contains CHROMATIOPHILLIC SUBSTANCE (nissil bodies) and Golgi apparatus are also seen.Network of threadlike structures known as neurofibrilis are also seen within the cell body and extending into axon.

--> DENDRONS: these are one or more extensions which branches to form many fine dendrites. The DENDRONS carry nerve impulses( action potential) that their dendrites receive to the cell body.

--> AXON: this is a long process which branches at it's free end to end in synaptic knobs. It carries electric impulses away from the cell body. Most times, a substance of Schwann cell known as MYELIN SHEATH which is composed of lipoprotein insulates axons and increases impulse speed.