. Applied anatomy and kinesiology. nd each nerve fiber must beso insulated that no message can jump across from one fiber toanother in the nerve, where they lie side by side for long neurilemma and the medullary sheath serve this of the motor axones have several terminal branches, oneneurone controlling several muscle fibers; evidently these must befibers that will always need to act together. Four hundred thousandmotor axones have been counted in the anterior nerve roots of asingle individual. These axones enter the muscle along with sen- 46 MUSCULAR CONTROL sory fi
. Applied anatomy and kinesiology. nd each nerve fiber must beso insulated that no message can jump across from one fiber toanother in the nerve, where they lie side by side for long neurilemma and the medullary sheath serve this of the motor axones have several terminal branches, oneneurone controlling several muscle fibers; evidently these must befibers that will always need to act together. Four hundred thousandmotor axones have been counted in the anterior nerve roots of asingle individual. These axones enter the muscle along with sen- 46 MUSCULAR CONTROL sory fibers, forming a mixed nerve; the nerve divides in the muscleand the fibers go to the various parts; each motor fiber finallyterminates inside of a muscle fiber with an ending like that shownin Fig. 22. The office of this ending is to transmit to the proto-plasm of the muscle fiber the message sent by the cell in the spinalcord. Under normal conditions it never conveys messages in theother direction. ]l;^^W^^ Ti* X ^i. 5* «; .>.
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