Abstract
The early mast cell changes arising from peripheral nerve injuries of different degrees of severity were studied. In sectioned, crushed and compressed rat sciatic nerves, a rapid degranulation of epineurial, perineurial and endoneurial mast cells was observed at the site of the trauma, whereas mast cells in the distal endoneurium were not de-granulated. The mast cell products, heparin, histamine and 5-hydroxy-tryptamine are apparently liberated in the traumatized region of the nerves, where they can exert their actions on other structures in the nerves.

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