Detrusor vesicae muscle
| Detrusor vesicae muscle |
|---|
| origin |
| surrounds the bladder |
| approach |
| surrounds the bladder |
| function |
| Bladder emptying |
| Innervation |
| Pelvinus nerve |
| Spinal segments |
| S2-S4 |
The musculus detrusor vesicae ( Latin - anat .; 'Expeller of the urinary bladder') is the name given to the strong muscle system that surrounds the urinary bladder or forms part of it. The smooth muscle consists of three layers (strata):
- an outer longitudinal muscle layer ( stratum longitudinal externum ),
- a middle layer with circular (circular) running fiber strands ( stratum circulare ) and
- an inner longitudinal muscle layer ( stratum longitudinale internum ) adjacent to the lamina propria .
While the central circular muscles do not reach the bladder exit , the longitudinal fibers converge towards the urethra , their inner longitudinal muscle layer being formed by a stratum longitudinal internum and the outer circular muscle layer by a stratum longitudinal externum . In addition, individual features of the muscle "expeller" go to the straps ligament pubovesicale and ligament puboprostaticum over.
The detrusor vesicae muscle plays a decisive role in emptying the bladder ( micturition ). Signals from the parasympathetic nervous system (via the pelvinus nerve ) lead to concentric tension in the muscular system , which puts the contents of the bladder under pressure. In addition, the detrusor vesicae muscle is influenced by an intrinsic nerve plexus that is located in the bladder wall and adapts its tone to the level of filling of the urinary bladder.