EXTRACTION FROM OX RETRACTOR PENIS OF AN INHIBITORY SUBSTANCE WHICH MIMICS ITS ATROPINE‐RESISTANT NEUROGENIC RELAXATION

Abstract
The inhibitory post‐ganglionic transmission in the retractor penis of the ox resembles that of the dog and is not cholinergic or adrenergic. Acid extracts of this tissue have yielded an unidentified, labile, inhibitory substance which mimics the effect of its inhibitory nerves.