Fenestrations in regenerating skeletal muscle capillaries.

A new observation of fenestrae with diaphragms in the endothelial wall of regenerating skeletal muscle capillaries is described in seven-day-old wounds of the cremaster muscle of adult male guinea pigs. The fenestrations were 44 nm in diameter and contained diaphragms with a central dense structure. These findings suggest an additional route for physiological exchange mechanisms in wound capillaries.