Biomedical subjects

M Koraitim

Publications and source records attributed to M Koraitim.

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↗

PubMed1977

Urogenitodynamics of the male bladder neck. 1. During continence.

The dynamic behavior of the male bladder neck during urinary continence was studied by electromyography in dogs and rabbits. On vesical filling, increased electrical activity in the form of biphasic potentials was recorded from the anterolateral segment of the bladder neck. These biphasic potentials became more frequent and higher in voltage with further filling of the bladder. Concurrently, the posterior segment showed no significant electromyographic changes. These findings indicate muscular contraction of only the anterolateral part of the bladder neck during vesical filling. We conclude that the sphincteric function of the bladder neck during urinary continence is achieved by the active muscular contraction of its anterolateral segment. We postulate that the posterior segment is mainly concerned with the genital function of the bladder neck.

Animals↗

PubMed1977

Urogenitodynamics of the male bladder neck. 2. During voiding.

The dynamic activity of the male bladder neck during voiding was studied by electromyography in dogs and rabbits. On vesical filling, increased electrical activity in the form of high voltage biphasic potentials was recorded from the anterolateral segment of the bladder neck. With the onset of voiding these high voltage potentials disappeared completely and only a low voltage base line activity was recorded. This indicates muscular relaxation of the anterolateral bladder neck. Concurrently, the posterior segment of the bladder neck showed insignificant electromyographic changes. We conclude that opening of the vesical outlet during voiding is achieved by the muscular relaxation of its anterolateral segment. The dynamic activity of the bladder neck is reciprocally coordinated with the detrusor muscle to produce continence and voiding of urine.

Animals↗