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SEGMENTAL INNERVATION OF MUSCLES

Anatomy-General

SEGMENTAL INNERVATION OF MUSCLES

1. A myotome is an amount of muscle supplied by a spinal segment.

2. Most muscles are supplied by 2 adjacent segments.

3. Muscles that share a common primary action are supplied by the same segments.

4. Their opponents are innervated by 2 adjacent segments that run in numerical sequence to the former. The upper 1-2 segments innervate one movement and the lower 1-2 segments innervate the opposite movement.

5. For joints distal in the limb the spinal segment lies lower in the cord.

6. In the upper limbs the 2 segment pattern is not as regular as the lower limbs as the UL are involved in more precise movements and the spinal centers are broken up into nuclei to control these.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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