A NEW THEORY OF MICTURITION AND URINARY CONTINENCE BASED ON HISTOMORPHOLOGICAL STUDIES .5. THE MUSCULUS EJACULATORIUS - A NEWLY DESCRIBED STRUCTURE RESPONSIBLE FOR SEMINAL EMISSION AND EJACULATION

Theories of seminal emission and ejaculation based on morphology espec ially of the dorsal longitudinal urethral muscle system are found very infrequently in the literature. Our own examinations carried out on s erial sections of the whole distal urethral complex taken from 50 male and 15 female autopsy preparations prove that the dorsal longitudinal urethral muscle system represents an independent smooth muscle. In th e female, the muscle system runs outside the sphincter system. In the male, it is the direct continuation of the musculature of the ejaculat ory ducts and its expansion is generally restricted to the urethra bel ow the colliculus seminalis. Within the urethra the urethral crest is protruded. Differences in the degree of the formation of the muscle in various age groups will be described. For this newly described muscle structure, we suggest the term musculus ejaculatorius as, due to pure ly anatomic reasons, an involvement in the process of ejaculation seem s to be conclusive. A theory of seminal emission and ejaculation is gi ven as a mass action of the musculature of the bladder neck.