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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 6 - Nervous Tissue

Plate 6.119 Motor End Plate

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed

Intercostal muscle

Plate 6.119 Motor End Plate

Rabbit, Ranvier's gold chloride method, 612 x.

The method used in this preparation is a classical technique for staining nerve endings (see also Plate 122). The muscle fibers seen here are not sectioned but are merely teased apart or spread by pressure. The advantages of this method are that it is simple and provides a broader view of the nerve terminals found on each muscle fiber in the preparation.

Muscle fibers: A small portion of three cross-striated muscle fibers is seen in this preparation.

Axon: A myelinated nerve fiber, upon reaching the muscle surface, loses its myelin sheath and branches extensively in a well-defined region called the motor end plate or myoneural junction.

Myoneural junction: The specialized region between the axon terminals and muscle fiber surface at which the nerve impulse is transmitted to the sarcolemma, resulting in muscular contraction.

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