Distribution of Certain Enzymes in the Brain of Pigeon ∗

Abstract

Summary and Conclusions

Histochemical methods were used to demonstrate the presence of alkaline and acid phosphatase, phos-phamidase, and cholinesterase in the brain of pigeons. It was found that there are marked differences in the enzyme contents of various structures in the brain. This observation corroborates the concept of biochemical differences between different parts or different functional and anatomical systems that has evolved from the work of a number of investigators.‡ The use of histochemical methods makes possible the more detailed study of the aChemoarchitectonics” of the vertebrate brain which will be of interest when correlated with the cyto-, myelo- and angioarchitectonics.