The detrusor muscle is located within the walls of the bladder and is composed of smooth muscle fibers that are longitudinal and circular. The layers of the detrusor muscle start longitudinally in the inner layer, become circular in the middle layer, and then longitudinal again in the outer layer.

What is detrusor muscle and why are they important?

The detrusor muscle, also detrusor urinae muscle, muscularis propria of the urinary bladder and (less precise) muscularis propria, is smooth muscle found in the wall of the bladder. The detrusor muscle remains relaxed to allow the bladder to store urine, and contracts during urination to release urine.

How do I activate my detrusor muscle?

In adults, the normal mechanism for activating contraction of the detrusor is the release of acetylcholine from parasympathetic nerves, stimulated by a spino bulbospinal micturition reflex,⁶ the main micturition reflex. Tension receptors in the detrusor activate afferents traveling in the pelvic nerves.

What is detrusor failure?

Flaccidity or failure of the detrusor muscle (the whirl of small muscles that comprise the bladder wall) is the most common cause of chronic retention and incomplete emptying of the bladder in women. This can present either as ineffective and partial emptying or as complete retention.

What type of tissue is the detrusor?

It's a type of connective tissue. Detrusor muscle (muscularis propria). This is the outer layer. It's the thick smooth muscle tissue outside the lamina propria.

The detrusor muscle

40 related questions found

What Innervates the detrusor muscle?

Parasympathetic innervation to the detrusor muscle begins with preganglionic neurons located in intermediate gray matter of the sacral spinal cord (S1-3). Preganglionic axons reach the pelvic plexus via the pelvic nerve and synapse on postganglionic neurons within pelvic ganglia.

What muscles are around the bladder?

The bladder is shaped like a pyramid when empty. It becomes more oval as it fills with urine and expands. A smooth muscle called the detrusor surrounds the bladder, and folds called rugae line the interior wall.

Can the detrusor muscle be strengthened?

Using cellular regenerative techniques, the detrusor smooth muscle can be targeted so the result is to increase detrusor smooth muscle function.

How do you treat detrusor muscle?

Treatment ranges from bethanechol for stimulation of detrusor contraction to clean intermittent self-catheterization. Injection of botulinum toxin and acupuncture, like sacral nerve neuromodulation, can help a number of patients with refractory impaired bladder emptying.

What is the function of the detrusor muscle?

The primary function of the detrusor muscle is to contract during urination to push the urine out of the bladder and into the urethra. The detrusor muscle will relax to allow the storage of urine in the urinary bladder.

Is detrusor muscle voluntary?

The detrusor is the smooth or involuntary muscle of the bladder wall. The urethral muscles consist of the external and internal sphincter. The internal sphincter and detrusor muscle are both under autonomic control. The external sphincter, however, is a voluntary muscle under the control of voluntary nerves.

What is detrusor pressure?

Detrusor pressure (P_det): The true bladder pressure. It is calculated by subtracting the abdominal pressure (P_abd), measured with a rectal catheter, from the vesical pressure (P_ves), measured with a catheter in the bladder.

What causes detrusor overactivity?

Common conditions such as urinary tract infection, kidney and bladder stones, or bladder tumors can all cause overactivity of the detrusor muscle, resulting in overactive bladder. Some nervous system conditions can increase the susceptibility to develop overactive bladder.

Is urination parasympathetic or sympathetic?

The sympathetic nervous system regulates the process of urine storage in the bladder. In contrast, the parasympathetic nervous system controls bladder contractions and the passage of urine.

What is detrusor overactivity?

Detrusor overactivity is defined as a urodynamic observation characterized by involuntary detrusor contractions during the filling phase that may be spontaneous or provoked. Detrusor overactivity is subdivided into idiopathic detrusor overactivity and neurogenic detrusor overactivity.

Why does sympathetic relax bladder?

When the sympathetic nervous system is active, it causes the bladder to increase its capacity without increasing detrusor resting pressure (accommodation) and stimulates the internal urinary sphincter to remain tightly closed.

How is detrusor overactivity treated?

Oxybutynin and tolterodine are the more commonly used anticholinergics in OAB treatment. Oxybutynin (Ditropan) was among the first anticholinergic agents to be used to treat detrusor overactivity, and its efficacy in treating OAB is well documented.

How do you tell if your bladder is not emptying fully?

Chronic urinary retention

1. the inability to completely empty your bladder when urinating.
2. frequent urination in small amounts.
3. difficulty starting the flow of urine, called hesitancy.
4. a slow urine stream.
5. the urgent need to urinate, but with little success.
6. feeling the need to urinate after finishing urination.

Do kidney stones cause bladder spasms?

Ureters are small and delicate, and the stones may be too large to pass smoothly down the ureter to the bladder. Passage of stones down the ureter can cause spasms and irritation of the ureters. This causes blood to appear in the urine. Sometimes stones block the flow of urine.

Do I need to push to empty my bladder?

You shouldn't have to use your muscles to force urine out. A healthy bladder works best if the body just relaxes so that the bladder muscles naturally contract to let the urine flow, rather than using the abdominal muscles to bear down as with a bowel movement.

What tube does urine leave the body?

Urethra. This tube allows urine to pass outside the body. The brain signals the bladder muscles to tighten, which squeezes urine out of the bladder. At the same time, the brain signals the sphincter muscles to relax to let urine exit the bladder through the urethra.

What is detrusor sphincter Dyssynergia?

Detrusor sphincter dyssynergia (DSD) is the urodynamic term for variable lower urinary tract symptoms due to detrusor muscle contraction with concomitant and inappropriate involuntary urethral sphincter contraction.[1]

What is the muscle that holds in urine?

Your bladder is a muscle shaped like a balloon and holds your urine. 2. The sphincter muscles. These muscles help you open and close your urethra, the tube that drains urine from your bladder.

Which layer of the urinary bladder is made of the detrusor muscle?

The visceral muscles of the muscularis layer surround the submucosa and provide the urinary bladder with its ability to expand and contract. The muscularis is commonly referred to as the detrusor muscle and contracts during urination to expel urine from the body.

What are the muscles of the pelvic floor?

The deep pelvic floor muscles consist of pubococcygeus, ileococcygeuys, coccygeus and puborectalis muscles. In fact, puborectalis muscle is located in between the superficial and deep muscle layers, and it is better to view this as the middle muscle layer of the pelvic floor.