The dentinal tubule and odontoblast process in the cat

The odontoblast process and dentinal tubule of the cat have been examined after vascular perfusion of aldehydes for periods of 20-60 minutes. The odontoblast process is apparently confined to the inner half of a dentinal tubule. Its structure consists of microtubules, microfilaments and a variable population of vesicles, all surrounded by a plasma membrane. The apparent limited peripheral extent of the process is perhaps an artefact due to incomplete penetration of the fixatives.