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    Related Topics

    From Musculoskeletal System

    Maxillae
    Upper jaw bones that house the teeth and form part of the orbit.
    Sternum
    Breastbone located in the center of the chest.
    Sphenoid Bone
    Bone forming part of the base of the skull and sides of the orbits.
    Sacrum
    Triangular bone at the base of the spine.
    Ribs (12 Pairs)
    12 pairs of bones that form the sides of the thoracic cage.
    Coccyx
    Tailbone, the remnant of the tail in humans.
    Flexor Tendons
    Tendons that help flex the fingers and toes.
    Symphyses
    Cartilaginous joints where bones are connected by fibrocartilage.
    Ligamentum Flavum
    Spinal ligament connecting the laminae of adjacent vertebrae.
    Humerus
    Upper arm bone connecting the shoulder to the elbow.
    Deltoid
    Shoulder muscle responsible for arm abduction.
    Lacrimal Bones
    Bones forming part of the eye socket and housing the tear ducts.
    Gastrocnemius
    Calf muscle responsible for plantarflexion of the foot.
    Zygomaticus
    Muscle that raises the corners of the mouth.
    Facial Bones
    Bones forming the structure of the face.
    Adductors
    Muscles that bring the thighs toward the midline.
    Radius
    Forearm bone on the thumb side.
    Lateral Collateral Ligament (LCL)
    Knee ligament that stabilizes the outer knee.
    Mandible
    Lower jawbone that houses the teeth.
    Occipital Bone
    Bone forming the back and base of the skull.
    Ischium
    Part of the pelvis that supports weight while sitting.
    Sacroiliac Ligaments
    Ligaments connecting the sacrum to the iliac bones.
    Parietal Bones
    Bones forming the sides and roof of the skull.
    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.
    Biceps Brachii
    Muscle responsible for elbow flexion.

    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.