A somatic lower motor neurone A. Innervates fewer fibres in an eye mu

1.	A somatic lower motor neurone A. Innervates fewer fibres in an eye muscle than does one innervating a leg muscle. B. Conducts impulses at a speed similar to that in an autonomic postganglionic neurone. C. Is unmyelinated. D. Conducts impulses which cause relaxation in some skeletal muscles. E. Synapse with skeletal muscle but not with other neurones.
Answer» A. True The more precise the movement required, the fewer the fibres supplied by one motor neurone. B. False Somatic motor neurones conduct at 60–120 m/sec; autonomic at about 1 m/sec. C. False Fast-conducting fibres are large and myelinated. D. False Impulses carried by somatic motor neurones are excitatory to skeletal muscle. E. False Some carry impulses to inhibitory (Renshaw) cells in the anterior horn.

A somatic lower motor neurone A. Innervates fewer fibres in an eye muscle than does one innervating a leg muscle. B. Conducts impulses at a speed similar to that in an autonomic postganglionic neurone. C. Is unmyelinated. D. Conducts impulses which cause relaxation in some skeletal muscles. E. Synapse with skeletal muscle but not with other neurones.

Answer»

A. True The more precise the movement required, the fewer the fibres supplied by one motor neurone.

B. False Somatic motor neurones conduct at 60–120 m/sec; autonomic at about 1 m/sec.

C. False Fast-conducting fibres are large and myelinated.

D. False Impulses carried by somatic motor neurones are excitatory to skeletal muscle.

E. False Some carry impulses to inhibitory (Renshaw) cells in the anterior horn.

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