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The vagina is a muscular tube located in the pelvis, and it plays a crucial role in reproduction, childbirth, and sexual well-being. The vaginal support structures include muscles, bones, ligaments, tendons, membranes, and fascia of the pelvic floor, which maintain the vagina's position within the pelvic cavity. The pelvic floor muscles help stabilize the core and assist with essential bodily functions like urination, defecation, and sexual intercourse. These muscles can weaken over time, leading to conditions like incontinence or pelvic organ prolapse, where organs bulge into the vagina or protrude from its opening. To address these issues, pelvic floor exercises, physical therapy, and in some cases, surgery may be recommended. The vagina itself consists of a tube of autonomically innervated smooth muscle, and when people refer to squeezing the vagina, they are actually engaging the pelvic floor muscles surrounding it.
| Characteristics | Values |
|---|---|
| Location | Vaginal muscles are located in the pelvis |
| Composition | Vaginal muscles are composed of smooth muscle fibres, collagen, elastic tissue, capillaries, nerve endings, and erectile tissue |
| Function | Vaginal muscles aid in reproduction, childbirth, sexual pleasure, and lubrication |
| Support | The vagina is supported by pelvic floor muscles, tendons, ligaments, and bones such as the pubis, ilium, and ischium |
| Exercises | Kegel exercises help strengthen vaginal muscles and improve bladder control |
| Conditions | Common vaginal conditions include cysts, prolapse, tears, and vaginismus |
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What You'll Learn
Pelvic floor muscles
The pelvic floor muscles are a set of muscles that stretch from the pubic bone at the front of the body to the tailbone (coccyx) at the back. They extend outward on both sitting bones (ischial tuberosity) on the right and left sides of the pelvis. The pelvic floor muscles intertwine to form a single sheet of layered muscle with openings for the anus, urethra, and vagina. These muscles support the organs in the pelvis, such as the bladder, bowel, and vagina, and help with bodily functions like urination, defecation, and sexual intercourse.
Weakened pelvic floor muscles can lead to pelvic organ prolapse, where organs like the uterus, rectum, or bladder bulge into or protrude from the vagina. This condition is more common after menopause. Signs of weakened pelvic floor muscles include struggling to control urination, defecation, or passing gas (incontinence). Pelvic floor muscles that are too tight, a condition known as hypertonic pelvic floor, can also lead to issues such as constipation, pelvic pain, and painful intercourse.
Pelvic floor exercises, also known as Kegels, are commonly recommended to strengthen the pelvic floor muscles. These exercises involve routinely squeezing and relaxing the pelvic muscles to build control. Biofeedback and electric stimulation techniques can be used to ensure correct muscle contraction during Kegels. Medical devices, such as vaginal pessaries, can also be used to support pelvic organs when the pelvic floor muscles are weak. In cases of severe pelvic organ prolapse, reconstructive surgery or obliterative procedures like colpocleisis may be necessary.
To locate the pelvic floor muscles, individuals can try stopping the flow of urine while sitting on the toilet or squeezing the muscles around the vaginal opening. Additionally, inserting a finger into the vagina and attempting to squeeze the muscles can help identify the correct muscles for Kegel exercises. It is important to consult a healthcare provider for guidance, especially if one has experienced childbirth or pelvic floor injuries.
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Vaginal support structures
The vagina is a stretchy, muscular tube located in the pelvis. It is supported by muscles, bones, ligaments, tendons, membranes, and fascia of the pelvic floor. These support structures maintain the position of the vagina within the pelvic cavity and enable its normal functioning, as well as that of other reproductive structures. The pelvic floor muscles stretch from the pubic bone in front to the tailbone (coccyx) at the back, with several muscles intertwining to form a single sheet of layered muscle with openings for the urethra, anus, and vagina.
The perineum, a grouping of muscles that constricts to close the urogenital openings, supports and functions as a sphincter at the opening of the vagina. The perineal body, a pyramidal structure of muscle and connective tissue, is located between the anus and vagina and is formed by the convergence of the bulbospongiosus muscle, superficial transverse perineal muscle, and external anal sphincter muscle. The lower vagina is attached to the perineal body by the pubococcygeus, perineal muscles, and the anal sphincter.
The muscular pelvic diaphragm is composed of the bilateral levator ani and coccygeus muscles, which attach to the inner pelvic surface. The levator ani surrounds the openings of the urethra, rectum, and vagina. The pubococcygeus muscle is subdivided into the pubourethralis, pubovaginalis, and puborectalis muscles, with names indicating their attachments to the urethra, vagina, anus, and rectum.
The vagina is attached to the pelvic walls by endopelvic fascia, a continuous sheet of tissue that varies in thickness and contains elastic collagen fibers, fibroblasts, smooth muscle, and vascular vessels. The cardinal ligament supports the apex of the vagina and derives strength from vascular tissue. The endopelvic fascia attaches to the lateral pelvic wall via the arcus tendineus.
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Vaginal cysts, tears, and prolapse
The vagina is a stretchy, muscular tube located in the pelvis. It is surrounded by three sets of skeletal muscles, namely the ischiocavernosum, bulbocavernosus, transverse perinei and levator ani, and pubococcygeus muscles. The pelvic floor muscles stretch from the pubic bone in the front of the body to the tailbone (coccyx) in the back.
Vaginal cysts are fluid-filled lumps located on or near the vagina. They are usually caused by childbirth, injury to the vagina, or blocked glands. Cysts can be as small as a pea or as large as an orange. They can be painless and go unnoticed until discovered by a gynecologist during a regular exam. However, they may also cause discomfort and pain during certain activities or when infected. Bartholin's gland cysts, for example, occur when the opening to the gland becomes blocked, causing a fluid-filled growth. These cysts can be treated by draining them or prescribing antibiotics.
Vaginal tears can occur during sex or vaginal delivery. Vaginal prolapse, on the other hand, occurs when the vagina slips out of place due to weakened pelvic floor muscles. Pelvic organ prolapse may require reconstructive surgery or an obliterative procedure like colpocleisis, where the vaginal walls are sewn together to prevent organs from extending outside the vagina. Pelvic floor exercises, or Kegels, can help strengthen the pelvic floor muscles and prevent conditions like vaginal prolapse. Additionally, medical devices such as a vaginal pessary can provide support to the pelvic organs if the pelvic floor muscles are too weak.
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Pelvic floor exercises
Pelvic floor muscle training exercises involve relaxing and tightening the muscles that control urine flow. One way to do this is to pretend that you have to urinate and then hold it. You can also insert a finger into your vagina to feel the muscles get tight and move up when you contract them. It is important to identify the correct muscles to tighten, and there are physical therapists who specialize in pelvic floor muscle training who can help.
There are also other exercises that activate the pelvic floor muscles, such as pelvic tilts and the bird-dog exercise. Pelvic tilts involve lying on your back with your knees bent and feet flat on the floor, tightening your abdominal muscles, and pressing your lower back into the floor. The bird-dog exercise involves starting on your hands and knees, engaging your core muscles, and simultaneously extending and raising your left leg and right arm while maintaining a neutral body position.
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Vaginal muscles and sexual pleasure
The vagina is a muscular tube located in the pelvis, and it plays a crucial role in reproduction, childbirth, and sexual well-being. The vaginal wall consists of an inner glandular mucous type of stratified squamous cell epithelium supported by a thick lamina propria. This epithelium undergoes hormone-related cyclical changes, including slight keratinization of the superficial cells during the menstrual cycle.
The vagina has several layers, including the adventitia layer, which provides structural support and allows the vagina to stretch and expand during intercourse and childbirth. The walls of the vagina have a significant blood supply and nerve endings, which aid in lubrication and sexual pleasure.
The pelvic floor muscles support the vagina and other pelvic organs. These muscles stretch from the pubic bone to the tailbone (coccyx) at the back, extending outward to both sitting bones (ischial tuberosity) on the pelvis's right and left sides. Pelvic floor muscles can weaken, leading to conditions like pelvic organ prolapse, where organs bulge into or protrude from the vagina. Weakened pelvic floor muscles can also cause incontinence issues.
Pelvic floor exercises, or Kegels, can help strengthen these muscles and improve sexual pleasure. These exercises involve squeezing and relaxing the pelvic muscles to build control. Biofeedback sensors can be used during Kegel exercises to help individuals identify the specific muscles being contracted.
Vaginismus is a condition where the vaginal muscles involuntarily contract, causing pain during vaginal penetration. It can be treated through education, counseling, and exercises such as vaginal dilator therapy, which helps individuals become more comfortable with penetration.
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Frequently asked questions
The vagina is a stretchy, muscular tube located in the pelvis. The vaginal wall consists of an inner glandular mucous type of stratified squamous cell epithelium supported by a thick lamina propia. The vaginal wall has a significant blood supply and nerve endings. The vagina has smooth muscle fibres, which you can't control. These muscles help expel fluids (discharge) from the vagina.
The vagina is surrounded by three sets of skeletal muscles: the ischiocavernosum, bulbocavernosus, transverse perinei, and levator ani and pubococcygeus muscles. The pubococcygeus muscle is subdivided into the pubourethralis, pubovaginal muscle and the puborectalis muscle. The vaginal muscles are part of the pelvic floor muscles, which stretch from the pubic bone in the front of the body to the tailbone (coccyx) in the back.
You can locate your pelvic floor muscles by inserting a finger or two inside your vagina and trying to squeeze them. You can also imagine that you're trying to stop the flow of pee midstream or trying to prevent yourself from passing gas. In each case, you should feel muscles inside your pelvis pull inward and upward. These are your pelvic floor muscles.
