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    Related Topics

    From Musculoskeletal System

    Metacarpals (5 bones)
    5 bones forming the palm of the hand.
    Vertebral Column
    Spinal column consisting of vertebrae.
    Hinge Joints
    e.g., elbow, knee
    Wormian Bones
    Sutural bones in the skull.
    Glenohumeral Ligaments
    Shoulder ligaments that stabilize the shoulder joint.
    Extensor Tendons
    Tendons that help extend the fingers and toes.
    Triceps Brachii
    Muscle responsible for elbow extension.
    Scapula
    Shoulder blade providing attachment for muscles of the upper limb.
    Clavicle
    Collarbone connecting the arm to the body.
    Sesamoid Bones
    e.g., patella, some found in hands/feet.
    Palatine Bones
    Bones forming part of the hard palate and nasal cavity.
    Acetabulum
    The acetabulum is the pelvic socket that connects with the femoral head to form the hip joint, vital for stability, movement, and weight-bearing.
    Flexor Tendons
    Tendons that help flex the fingers and toes.
    Facial Bones
    Bones forming the structure of the face.
    Quadriceps Tendon
    Tendon that connects the quadriceps to the patella.
    Rotator Cuff Tendons
    Tendons of the rotator cuff muscles.
    Flexor and Extensor Groups
    Muscles responsible for flexing and extending the hand and wrist.
    Lacrimal Bones
    Bones forming part of the eye socket and housing the tear ducts.
    Tibialis Anterior
    Muscle that dorsiflexes and inverts the foot.
    Tibia
    Shin bone, the larger bone in the lower leg.
    Latissimus Dorsi
    Back muscle responsible for arm adduction and extension.
    Parietal Bones
    Bones forming the sides and roof of the skull.
    Ischium
    Part of the pelvis that supports weight while sitting.
    Sternum
    Breastbone located in the center of the chest.
    Nasal Bones
    Bones forming the bridge of the nose.

    Pelvic Floor Muscles

    Reviewed by our medical team

    Muscles that support pelvic organs.

    1. Overview

    The pelvic floor muscles are a group of muscles that span the bottom of the pelvis, forming a supportive hammock-like structure. These muscles support the pelvic organs (bladder, intestines, uterus in females), maintain continence, aid in sexual function, and stabilize the core. The pelvic floor consists of both deep and superficial layers and includes voluntary skeletal muscles under somatic control.

    2. Location

    The pelvic floor muscles are located at the base of the pelvic cavity, extending from the pubic bone anteriorly to the coccyx posteriorly, and from one ischial tuberosity to the other laterally:

    • Inferior boundary: Of the abdominopelvic cavity.

    • Superficial layer: Lies just beneath the perineal skin.

    • Deep layer: Forms the true pelvic diaphragm, situated above the perineal membrane.

    3. Structure

    The pelvic floor is composed of three main layers:

    1. Pelvic Diaphragm (deepest layer)

    • Levator ani group:

      • Pubococcygeus

      • Puborectalis

      • Iliococcygeus

    • Coccygeus (ischiococcygeus): Supports the coccyx and helps close off the pelvic outlet.

    2. Deep Perineal Layer

    • Includes the deep transverse perineal muscle and external urethral sphincter.

    3. Superficial Perineal Layer

    • Includes the bulbospongiosus, ischiocavernosus, and superficial transverse perineal muscles.

    All pelvic floor muscles are innervated primarily by the pudendal nerve (S2–S4), with some contributions from the nerve to levator ani and coccygeal plexus.

    4. Function

    Pelvic floor muscles perform several critical functions:

    • Support of pelvic organs: Maintain the position and structural integrity of the bladder, rectum, and reproductive organs.

    • Continence: Control voluntary contraction and relaxation of the urethral and anal sphincters, essential for urinary and fecal continence.

    • Sexual function: Contract during orgasm and help maintain erection in males and vaginal tone in females.

    • Childbirth: Stretch and support the baby’s passage through the birth canal; puborectalis and pubococcygeus play crucial roles.

    • Postural support: Contribute to core stability in coordination with abdominal and back muscles.

    5. Physiological role(s)

    Beyond mechanical function, the pelvic floor integrates with broader physiological systems:

    • Respiratory rhythm: Works with the diaphragm during breathing to maintain intra-abdominal pressure.

    • Pressure regulation: Coordinates with the abdominal wall to manage internal pressures during lifting, coughing, and defecation.

    • Neurovascular control: Supports autonomic function for micturition, defecation, and arousal via reflex arcs and sensory feedback.

    6. Clinical Significance

    Pelvic floor dysfunction can lead to a range of conditions affecting quality of life:

    • Pelvic organ prolapse:

      • Weakness or damage to the pelvic floor may allow descent of the uterus, bladder (cystocele), or rectum (rectocele) into the vaginal canal.

    • Urinary incontinence:

      • Stress incontinence (e.g., during coughing or sneezing) is often due to weak pelvic floor muscles, especially post-childbirth or in aging.

    • Fecal incontinence:

      • Damage to the external anal sphincter or puborectalis muscle may impair bowel control.

    • Chronic pelvic pain:

      • May result from spasm, trigger points, or tension in pelvic floor musculature.

    • Pelvic floor myalgia:

      • Characterized by painful muscle contractions; often linked to trauma, overuse, or psychological stress.

    • Rehabilitation and therapy:

      • Pelvic floor physical therapy, including Kegel exercises and biofeedback, is effective in managing dysfunctions.

    Did you know? Your spinal cord is protected by the vertebral column.