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    Related Topics

    From Musculoskeletal System

    Zygomatic Bones
    Cheekbones that form part of the orbit.
    Patellar Tendon
    Tendon connecting the patella to the tibia.
    Temporalis
    Muscle involved in closing the jaw.
    Facial Bones
    Bones forming the structure of the face.
    Buccinator
    Muscle that helps with chewing and blowing air out.
    Biceps Tendon
    Tendon that attaches the biceps muscle to the bone.
    Metacarpals (5 bones)
    5 bones forming the palm of the hand.
    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.
    Radius
    Forearm bone on the thumb side.
    Sternum
    Breastbone located in the center of the chest.
    Sacroiliac Ligaments
    Ligaments connecting the sacrum to the iliac bones.
    Inferior Nasal Conchae
    Bones inside the nasal cavity that filter and humidify air.
    Gluteus Maximus
    Largest muscle in the buttocks responsible for hip extension.
    Adductors
    Muscles that bring the thighs toward the midline.
    Flexor Tendons
    Tendons that help flex the fingers and toes.
    Quadriceps
    Rectus Femoris, Vastus Medialis, Vastus Lateralis, Vastus Intermedius.
    Hinge Joints
    e.g., elbow, knee
    Femur
    Thigh bone, the longest and strongest bone in the body.
    Coccygeus
    Pelvic floor muscle supporting the coccyx.
    Obliques (External and Internal)
    Muscles responsible for torso rotation.
    Anterior Longitudinal Ligament
    Spinal ligament running along the front of the vertebral column.
    Annular Ligament
    The annular ligament is a strong fibrous band encircling the head of the radius, stabilizing the proximal radioulnar joint and allowing smooth rotation of the forearm.
    Fibula
    Smaller bone in the lower leg, located alongside the tibia.
    Tibialis Anterior
    Muscle that dorsiflexes and inverts the foot.
    Mandible
    Lower jawbone that houses the teeth.

    Pubis

    Reviewed by our medical team

    Part of the pelvis that joins with the opposite side to form the pubic symphysis.

    1. Overview

    The pubis, or pubic bone, is one of the three bones that make up the os coxae (hip bone), alongside the ilium and ischium. It is located at the front of the pelvis and plays a crucial role in supporting body weight, forming part of the pelvic ring, and providing structural support for the attachment of muscles involved in posture, movement, and protection of pelvic organs.

    2. Location

    The pubis is located in the anterior and inferior part of the pelvis:

    • Anteriorly: Joins with the pubis of the opposite side at the pubic symphysis.

    • Posteriorly and laterally: Joins with the ilium and ischium at the acetabulum.

    • Inferiorly: Contributes to the borders of the obturator foramen and supports part of the pelvic floor.

    3. Structure

    The pubis consists of three parts:

    • Body of the pubis: The central portion that articulates with the body of the contralateral pubis at the pubic symphysis. It provides the anterior margin of the pelvic inlet.

    • Superior pubic ramus: Extends laterally from the body to contribute to the acetabulum. Contains the pectineal line and pubic crest.

    • Inferior pubic ramus: Descends downward to fuse with the ischial ramus, contributing to the border of the obturator foramen.

    Additional features include:

    • Pubic tubercle: A prominent projection near the pubic symphysis where the inguinal ligament attaches.

    • Obturator groove: Located on the superior ramus, forms part of the obturator canal for neurovascular passage.

    • Symphyseal surface: Articulates with the opposite pubis via a fibrocartilaginous joint (pubic symphysis).

    4. Function

    The pubis bone performs several mechanical and structural functions:

    • Forms part of the pelvic girdle: Contributes to the ring-like structure that supports the upper body and transmits weight to the lower limbs.

    • Supports pelvic organs: Helps form the anterior boundary of the pelvic cavity, protecting the bladder and reproductive organs.

    • Muscle attachment: Provides origin or insertion sites for muscles such as the adductors, gracilis, and rectus abdominis.

    • Joint formation: Part of the acetabulum, enabling articulation with the femoral head at the hip joint.

    5. Physiological role(s)

    The pubis plays a role in various physiological systems:

    • Reproductive support: In females, helps protect reproductive organs like the uterus and vagina; in males, contributes to the support of the penis and scrotum.

    • Childbirth: The pubic symphysis slightly loosens during pregnancy due to hormonal effects, aiding in parturition by widening the pelvic outlet.

    • Locomotion and posture: Works with adjacent bones and joints to enable upright posture and coordinated leg movement.

    • Contributes to core stability: Acts as an anchor point for abdominal and pelvic floor muscles that stabilize the trunk and lower torso.

    6. Clinical Significance

    Several clinical conditions are associated with the pubis:

    • Pubic symphysis dysfunction (PSD):

      • Common in pregnancy; caused by ligamentous relaxation and pelvic instability, resulting in pain and difficulty walking.

    • Osteitis pubis:

      • An inflammatory condition often seen in athletes due to repetitive stress or trauma at the pubic symphysis; causes groin pain and restricted movement.

    • Pelvic fractures:

      • High-energy trauma (e.g., from accidents or falls) can lead to fractures involving the pubis, often associated with damage to the bladder or urethra.

    • Diastasis of the pubic symphysis:

      • Abnormal widening of the pubic symphysis, sometimes due to trauma or difficult childbirth.

    • Surgical landmark:

      • The pubic tubercle is an important reference point for surgeries involving the inguinal region, including hernia repairs.

    Did you know? Tendons attach muscles to bones.