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    Related Topics

    From Musculoskeletal System

    Fibula
    Smaller bone in the lower leg, located alongside the tibia.
    Extensor Tendons
    Tendons that help extend the fingers and toes.
    Hyoid Bone
    U-shaped bone in the neck that supports the tongue.
    Thoracic Vertebrae (T1 - T12)
    Vertebrae in the upper and mid-back (T1-T12).
    Clavicle
    Collarbone connecting the arm to the body.
    Coccyx
    Tailbone, the remnant of the tail in humans.
    Diaphragm
    Primary muscle for breathing.
    Parietal Bones
    Bones forming the sides and roof of the skull.
    Pubis
    Part of the pelvis that joins with the opposite side to form the pubic symphysis.
    Gluteus Maximus
    Largest muscle in the buttocks responsible for hip extension.
    Cervical Vertebrae (C1 - C7)
    Vertebrae in the neck region (C1-C7).
    Ilium
    Uppermost and largest part of the hip bone.
    Maxillae
    Upper jaw bones that house the teeth and form part of the orbit.
    Gastrocnemius
    Calf muscle responsible for plantarflexion of the foot.
    Lumbar Vertebrae (L1 - L5)
    Vertebrae in the lower back (L1-L5).
    Skull
    Bony structure of the head that encases the brain.
    Brachioradialis
    Muscle responsible for forearm flexion.
    Anterior Scalene Muscle
    The anterior scalene muscle is a deep neck muscle that elevates the first rib during inspiration and aids in neck flexion and stability, located between key neurovascular structures.
    Femur
    Thigh bone, the longest and strongest bone in the body.
    Sphenoid Bone
    Bone forming part of the base of the skull and sides of the orbits.
    Vertebral Column
    Spinal column consisting of vertebrae.
    Vomer Bone
    Bone forming the nasal septum.
    Pectoralis Major
    Chest muscle responsible for shoulder movement.
    Inferior Nasal Conchae
    Bones inside the nasal cavity that filter and humidify air.
    Anterior Longitudinal Ligament
    Spinal ligament running along the front of the vertebral column.

    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? Each human hand has 27 bones.