Abstract
The weight and girth of a muscle belly denervated in the three-week-old rabbit eventually grows to about 30%, its total collagen content to almost 300% and the thickness of its tendon to approximately 75% of those of the controls. There is, as occurs during normal growth, the same increase from 0$\cdot $7 to 1$\cdot $25 in the ratio of the thickness of the tendon of peroneus brevis to that of tibialis anterior. If a muscle is completely excised at three weeks, its tendon, which is subjected only to passive tensions during movement, grows to as much as 85% of the girth of its control. If, however, such passive tensions are eliminated as far as is possible, the isolated tendon may grow no more in thickness.

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