The neuromuscular spindles in the adult chicken

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Abstract
The neuro-muscular spindles of the adult chicken gastrocnemius muscle are studied by means of histochemical techniques for carbohydrates, lipids, proteins and enzymes. The existence of different types of intrafusal fibers is evident. The smaller fibers exhibit features similar to the red extrafusal fibers during development, while larger intrafusal fibers are similar to the white immature extrafusal fibers. An intermediate type of fiber is also described. All intrafusal fibers undergo changes at the level of the equatorial zone (nuclear chains and nuclear bags appear). The intense activity observed at that level is related to the presence of the sensory ending and to a greater metabolic activity. The intrafusal population is similar, but not equal, to the extrafusal one, though it is equivalent to the latter in immature stages of development.

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