endotenon en · NOUN
Etymology
From endo- + Ancient Greek τένων (ténōn, “tendon”).
Meanings
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The fine connective tissue between the strands of a tendon.
In the later cases, the transplanted tendon showed a slight hypertrophy of the endotenon and of the blood-vessels (Fig. 2) and was slightly softer than the normal; otherwise no changes were noted.
1916, Leo Mayer, “The physiological method of tendon transplantation”, in Surgery, Gynecology & Obstetrics, volume 22, page 475: