Maximus Gage
The puborectalis muscle is a thick, narrow muscle that forms a U-shaped sling around the anal canal and rectum. It is part of the levator ani muscle group, which is a broad muscular sheet located in the pelvis. The levator ani is made up of three muscles: puborectalis, pubococcygeus, and iliococcygeus. The puborectalis muscle is the most medial of the three and is responsible for maintaining faecal continence. It acts in association with the internal and external anal sphincters during defecation.
| Characteristics | Values |
|---|---|
| Type | Pelvic floor muscle |
| Part of | Levator ani muscle group |
| Origin | Posterior surface of the pubis |
| Shape | U-shaped |
| Function | Maintains faecal continence, supports pelvic visceral structures, and plays a role in defecation, urination, and sexual function |
| Innervation | Nerve to levator ani, pudendal nerve, perineal branches of the S3 and S4 nerve roots |
| Blood supply | Inferior gluteal, inferior vesical, and pudendal arteries |
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What You'll Learn
- The puborectalis is part of the levator ani muscle group
- It forms a U-shaped sling around the anal canal
- It is the most important muscle for maintaining faecal continence
- It acts in association with the internal and external anal sphincter during defecation
- It originates from the inferior part of the pubic symphysis
The puborectalis is part of the levator ani muscle group
The puborectalis is a muscle of the pelvic floor. It is part of the levator ani muscle group, which is a broad, thin muscle group situated on either side of the pelvis. The levator ani muscle comprises three parts: the puborectalis, pubococcygeus, and iliococcygeus.
The puborectalis muscle forms a sling around the lower rectum when it meets the fibres from the opposite side. It acts in association with the internal and external anal sphincters in the process of defecation. The puborectalis is the most important muscle for maintaining faecal continence. Tonic contraction of the puborectalis muscle pulls the anal canal forward toward the pubis, thus maintaining a sharp rectoanal angulation.
The levator ani muscle is the largest component of the pelvic floor. It provides support to the pelvic visceral structures and plays an important role in urinary voiding, defecation, and sexual function. The pubococcygeus muscle supports the vagina and prostate in females and males, respectively, and also controls the flow of urine. The iliococcygeus muscle extends more laterally from the fascia of the obturator internus muscle to the tailbone. It helps to resist increases in intra-abdominal pressure.
The levator ani muscle is crucial in stabilising the abdominal and pelvic organs. It is attached to the inner surface of each side of the lesser pelvis, and these unite to form the greater part of the pelvic floor. The coccygeus muscle completes the pelvic floor, also known as the pelvic diaphragm. The levator ani muscle is also important in maintaining urinary and bowel continence.
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It forms a U-shaped sling around the anal canal
The puborectalis muscle is a thick, narrow part of the levator ani muscle group, which is a broad muscular sheet located in the pelvis. The levator ani is formed from three muscle components: the pubococcygeus, the iliococcygeus, and the puborectalis. The puborectalis muscle originates from the inferior part of the pubic symphysis and the superior fascial layer of the urogenital diaphragm. It then courses backward and meets the fibres from the opposite muscle at the midline.
The puborectalis muscle forms a U-shaped sling around the anal canal. This sling is formed when the puborectalis meets the fibres from the opposite side. It acts in association with the internal and external anal sphincter during the process of defecation. The tonic contraction of the puborectalis muscle pulls the anal canal forward toward the pubis, thus maintaining a sharp rectoanal angulation. This angulation acts as a flap-valve sphincter mechanism, contributing to faecal continence.
The puborectalis muscle is separated from the external anal sphincter by a fascial layer. It is innervated by direct somatic efferent nerves from the sacral plexus, while the external anal sphincter muscle receives its innervation from the inferior rectal branches of the pudendal nerves. The superficial layers of the muscle ring insert into the skin of the perianal region, and the deeper layers interdigitate in the midline anteriorly and posteriorly.
The levator ani muscle group, including the puborectalis, plays a crucial role in maintaining pelvic stability and function. It supports the pelvic visceral structures and resists increases in intra-abdominal pressure. The levator ani muscle also has important functions in urinary voiding, defecation, and sexual function.
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It is the most important muscle for maintaining faecal continence
The puborectalis muscle is a thick, narrow muscle that is part of the levator ani muscle group. The levator ani is a broad, thin muscle group situated on either side of the pelvis. It is formed from three muscle components: the pubococcygeus, the iliococcygeus, and the puborectalis.
The puborectalis muscle forms a U-shaped sling around the anal canal and attaches to the pubis on the opposite side. This muscle is the most important for maintaining faecal continence. The tonic contraction of the puborectalis muscle pulls the anal canal forward toward the pubis, creating a sharp rectoanal angulation. This angulation acts as a flap-valve sphincter mechanism, contributing to faecal continence. The puborectalis muscle is voluntarily inhibited during defecation, allowing for the relaxation of the internal and external anal sphincters and facilitating rectal emptying.
The puborectalis muscle is also involved in maintaining urinary continence. Similar to the external anal sphincter, it exhibits tonic basal activity and consists of type 1 tonic muscle fibers. The tonic contraction of the puborectalis muscle, along with the external anal sphincter, increases during periods of increased abdominal pressure, such as coughing or changes in posture. This increased recruitment of these muscles helps maintain continence.
The puborectalis muscle is innervated by the perineal branches of the S3 and S4 nerve roots, as well as the pudendal nerve. The pudendal nerve also contributes to the innervation of the levator ani muscle. The morphological integrity of the puborectalis muscle can be assessed through palpation, with the palpating finger placed parallel to the urethra and its palmar surface pressed against the posterior surface of the symphysis pubis.
In summary, the puborectalis muscle plays a crucial role in maintaining faecal continence through its tonic contraction, which creates a sharp rectoanal angulation. It is also involved in urinary continence and exhibits tonic basal activity similar to the external anal sphincter. The puborectalis muscle is voluntarily inhibited during defecation, facilitating the process.
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It acts in association with the internal and external anal sphincter during defecation
The puborectalis muscle is a thick, narrow muscle that is part of the levator ani muscle group. The levator ani is a broad, thin muscle group situated on either side of the pelvis. It is formed from three muscle components: the pubococcygeus, the iliococcygeus, and the puborectalis. The puborectalis muscle forms a U-shaped sling around the lower rectum and anal canal, attaching to the pubis on the opposite side.
The puborectalis muscle plays a crucial role in maintaining faecal continence. Its tonic contraction pulls the anal canal forward toward the pubis, creating a sharp rectoanal angle. This angle acts as a flap-valve sphincter mechanism, keeping the anal canal usually empty.
During defecation, the puborectalis muscle relaxes, increasing the angle between the rectum and anus. This relaxation occurs in conjunction with the relaxation of the internal and external anal sphincters, allowing for the expulsion of stool. The coordination between the puborectalis muscle and the internal and external anal sphincters is essential for the process of defecation and maintaining continence.
The puborectalis muscle is not a major voluntary muscle of continence. It is in a constant state of low-level tonic resting contraction, even during sleep. However, increased recruitment of the puborectalis muscle occurs during periods of increased abdominal pressure, such as straining, coughing, or changes in posture. This increased recruitment contributes to the maintenance of continence during these activities.
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It originates from the inferior part of the pubic symphysis
The puborectalis muscle is a thick, narrow muscle that is part of the levator ani muscle group. The levator ani is a broad, thin muscle group situated on either side of the pelvis. It is formed from three muscle components: the pubococcygeus, the iliococcygeus, and the puborectalis. The puborectalis muscle originates from the inferior part of the pubic symphysis and the superior fascial layer of the urogenital diaphragm.
The puborectalis muscle forms a U-shaped sling around the lower rectum and anal canal, meeting the fibres from the opposite muscle at the midline. This sling forms the innermost margin of the pelvic floor diaphragm. The pelvic diaphragm is formed by the levator ani muscle, the coccygeus muscle, and their associated fascias. The levator ani is the main pelvic floor muscle and is responsible for supporting the pelvic visceral structures and allowing various pelvic structures to pass through it. It contracts rhythmically during female orgasm and painfully during vaginismus.
The puborectalis muscle acts in association with the internal and external anal sphincters during the process of defecation. Tonic contraction of the puborectalis muscle pulls the anal canal forward toward the pubis, maintaining a sharp rectoanal angulation. This angulation is thought to act as a flap-valve sphincter mechanism, keeping the anal canal usually empty. Relaxation of the puborectalis muscle, along with the internal and external anal sphincters, increases the angle between the rectum and anus, allowing defecation.
The puborectalis muscle is also involved in maintaining faecal continence. It is one of the only muscles in the human body that shows continuous basal activity, along with the cricopharyngeal sphincter muscles, the muscles of the floor of the mouth, and the intrinsic abductor muscles of the vocal cords in the larynx. The puborectalis muscle is innervated by the nerve to levator ani and the pudendal nerve. It receives blood supply from the inferior gluteal, inferior vesical, and pudendal arteries.
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Frequently asked questions
The puborectalis is a thick, narrow muscle that is part of the levator ani muscle group. It forms a U-shaped sling around the anal canal and rectum, and is important for maintaining faecal continence.
The puborectalis muscle acts in association with the internal and external anal sphincter to maintain faecal continence and facilitate defecation. It also helps to stabilise the abdominal and pelvic organs.
The puborectalis muscle is located in the pelvis and is part of the pelvic floor. It originates from the inferior part of the pubic symphysis and the superior fascial layer of the urogenital diaphragm.
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