ABSTRACT
Histological and histochemical techniques have demonstrated that the epithelium in the lower end of the oesophagus of the cat consists of three well-defined zones, namely superficial, intermediate, and basal.
Wound healing in the lower end of the oesophagus has been studied following the removal of small areas of mucosa.
Epithelial repair occurred by migration of cells, accompanied by increased mitotic activity in the surrounding undisturbed epithelium.
The alkaline phosphatase and PAS-positive material (other than glycogen) that were present in normal epithelium were not seen in migrating cells, which contained considerable quantities of glycogen.
The newly forming connective tissue elements in the floor of the wound did not contain alkaline phosphatase at any stage of the healing process.