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W Schafer

Publications and source records attributed to W Schafer.

4 recordsLinked to original sources
PubMed1977

Dynamic activity of bladder neck and external sphincter in ejaculation.

The bladder neck shows a typical electromyographic pattern in ejaculation. It consists of periods of heightened activity rhythmically alternating with intervals of reduced activity signifying muscular contraction and relaxation. This behavior of the bladder neck is confined to its ventral part. Concurrently, the external sphincter shows a short period of increased activity before the typical rhythmical pattern which corresponds to that of the ventral bladder neck.

Animals↗
PubMed1977

Vesicourethral continuity in bladder neck activity.

Electromyographic study of the bladder neck during vesical filling and emptying was performed in anesthetized dogs. Increased electrical potentials denoting active contraction of bladder neck were obtained on vesical filling. The bladder was then completely divided just above the vesical orifice, and the resulting apertures were closed to form two separate compartments. Still increased electrical potentials of bladder neck were recorded on filling the proximal compartment. We conclude that vesical neck activities are not directly dependent on the detrusor or on any anatomic continuity between bladder and urethral muscles.

Animals↗