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    Related Topics

    From Musculoskeletal System

    Saddle Joints
    e.g., thumb joint
    Symphyses
    Cartilaginous joints where bones are connected by fibrocartilage.
    Tibialis Anterior
    Muscle that dorsiflexes and inverts the foot.
    Acromioclavicular Ligament
    Ligament that connects the acromion to the clavicle.
    Biceps Tendon
    Tendon that attaches the biceps muscle to the bone.
    Sutures (in the skull)
    Fibrous joints between skull bones.
    Patella
    Knee cap, protecting the knee joint.
    Masseter
    Muscle that elevates the mandible.
    Glenohumeral Ligaments
    Shoulder ligaments that stabilize the shoulder joint.
    Lacrimal Bones
    Bones forming part of the eye socket and housing the tear ducts.
    Interspinous Ligament
    Spinal ligament between adjacent vertebral spinous processes.
    Femur
    Thigh bone, the longest and strongest bone in the body.
    Hyoid Bone
    U-shaped bone in the neck that supports the tongue.
    Flexor Tendons
    Tendons that help flex the fingers and toes.
    Sartorius
    Longest muscle in the body responsible for hip flexion.
    Sphenoid Bone
    Bone forming part of the base of the skull and sides of the orbits.
    Ischium
    Part of the pelvis that supports weight while sitting.
    Anterior Cruciate Ligament (ACL)
    Knee ligament that stabilizes the joint.
    Sacroiliac Ligaments
    Ligaments connecting the sacrum to the iliac bones.
    Metatarsals (5 bones)
    5 bones forming the mid-foot.
    Latissimus Dorsi
    Back muscle responsible for arm adduction and extension.
    Coracoacromial Ligament
    Ligament that connects the acromion to the coracoid process.
    Acromioclavicular Joint
    The acromioclavicular joint connects the clavicle and scapula at the top of the shoulder, enabling smooth scapular motion and stability during arm movements.
    Synchondroses
    Cartilaginous joints where bones are connected by hyaline cartilage.
    Maxillae
    Upper jaw bones that house the teeth and form part of the orbit.

    Gluteus Maximus

    Reviewed by our medical team

    Largest muscle in the buttocks responsible for hip extension.

    1. Overview

    The gluteus maximus is the largest and most superficial of the three gluteal muscles. It forms the bulk of the buttock and is one of the strongest muscles in the human body. This powerful extensor of the hip joint plays a central role in maintaining posture, locomotion, and explosive movements such as running, jumping, and climbing. It also contributes significantly to the shape and contour of the posterior pelvis.

    2. Location

    The gluteus maximus is located in the posterior region of the pelvis:

    • Superficially: Lies directly under the skin and subcutaneous tissue of the buttock.

    • Medially: Originates near the sacrum and coccyx.

    • Laterally and inferiorly: Inserts into the iliotibial tract and gluteal tuberosity of the femur.

    • Adjacent structures: Covers the deeper gluteus medius and minimus muscles, sciatic nerve, and other posterior hip muscles.

    3. Structure

    The gluteus maximus is a thick, quadrilateral muscle with a broad origin and a narrow insertion:

    • Origin:

      • Posterior iliac crest

      • Dorsal surface of the sacrum and coccyx

      • Sacrotuberous ligament

      • Thoracolumbar fascia

    • Insertion:

      • Gluteal tuberosity of the femur

      • Iliotibial (IT) tract, which continues to the lateral condyle of the tibia

    • Innervation: Inferior gluteal nerve (L5, S1, S2)

    • Blood supply: Primarily from the superior and inferior gluteal arteries

    4. Function

    The gluteus maximus is primarily responsible for extension of the hip joint, but it also contributes to other movements:

    • Hip extension: Especially during forceful movements like climbing stairs or rising from a seated position.

    • External (lateral) rotation of the hip: Rotates the thigh outward.

    • Abduction of the hip: The upper fibers assist in moving the thigh away from the midline.

    • Stabilization: Helps stabilize the pelvis and the knee (via the IT band) during locomotion.

    5. Physiological role(s)

    Beyond mechanical movement, the gluteus maximus plays key physiological roles:

    • Postural support: Maintains upright posture by resisting hip flexion during standing and walking.

    • Energy storage: Assists in elastic recoil during gait by storing energy in the fascia and tendons.

    • Pelvic alignment: Maintains the alignment of the pelvis and lumbar spine during dynamic movement.

    • Thermal regulation and protection: Due to its size and superficial position, it insulates and cushions underlying structures, including the sciatic nerve.

    6. Clinical Significance

    The gluteus maximus is involved in various clinical conditions and is important in rehabilitation and sports medicine:

    • Gluteal strain or tear:

      • Common in athletes, especially sprinters and jumpers, leading to pain and weakness in hip extension.

    • Gluteal atrophy:

      • Can result from disuse, nerve injury, or prolonged immobilization; associated with lower back pain and gait abnormalities.

    • Inferior gluteal nerve injury:

      • Causes weakness in hip extension, difficulty climbing stairs or rising from a chair.

    • Trochanteric bursitis:

      • May be aggravated by overuse or weakness of the gluteus maximus, leading to lateral hip pain.

    • Sciatic nerve compression:

      • Hypertrophy or tightness of the gluteal muscles can irritate the underlying sciatic nerve.

    • Rehabilitation focus:

      • Gluteus maximus strengthening is a key component in programs for lower back pain, knee injuries, and hip dysfunctions.

    Did you know? The ischium is the part of the pelvis you sit on.