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    Related Topics

    From Musculoskeletal System

    Sesamoid Bones
    e.g., patella, some found in hands/feet.
    Pivot Joints
    e.g., atlanto-axial joint
    Ligamentum Flavum
    Spinal ligament connecting the laminae of adjacent vertebrae.
    Lateral Collateral Ligament (LCL)
    Knee ligament that stabilizes the outer knee.
    Quadriceps
    Rectus Femoris, Vastus Medialis, Vastus Lateralis, Vastus Intermedius.
    Tarsals (7 bones)
    7 ankle bones.
    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.
    Palatine Bones
    Bones forming part of the hard palate and nasal cavity.
    Skull
    Bony structure of the head that encases the brain.
    Mandible
    Lower jawbone that houses the teeth.
    Soleus
    Calf muscle responsible for plantarflexion of the foot.
    Ischium
    Part of the pelvis that supports weight while sitting.
    Sternum
    Breastbone located in the center of the chest.
    Hamstrings
    Biceps Femoris, Semitendinosus, Semimembranosus.
    Syndesmoses
    Fibrous joints where bones are connected by ligaments.
    Frontal Bone
    Bone forming the forehead and upper part of the orbits.
    Posterior Cruciate Ligament (PCL)
    Knee ligament that stabilizes the joint.
    Occipital Bone
    Bone forming the back and base of the skull.
    Thoracic Cage
    Ribs and sternum forming the protective cage for the heart and lungs.
    Anterior Cruciate Ligament (ACL)
    Knee ligament that stabilizes the joint.
    Sphenoid Bone
    Bone forming part of the base of the skull and sides of the orbits.
    Coccygeus
    Pelvic floor muscle supporting the coccyx.
    Obliques (External and Internal)
    Muscles responsible for torso rotation.
    Patella
    Knee cap, protecting the knee joint.
    Trapezius
    Muscle responsible for moving, rotating, and stabilizing the scapula.

    Nasal Bones

    Reviewed by our medical team

    Bones forming the bridge of the nose.

    1. Overview

    The nasal bones are two small, oblong bones that form the bridge of the nose. These paired bones are part of the facial skeleton and play a key role in shaping the nose and supporting the cartilaginous structures of the nasal cavity. Though small in size, they contribute to both the aesthetic and functional architecture of the upper midface.

    2. Location

    The nasal bones are located in the upper-middle part of the face, at the superior aspect of the nose:

    • Medially: They articulate with each other at the midline via the internasal suture.

    • Superiorly: Articulate with the frontal bone at the frontonasal suture.

    • Laterally: Articulate with the frontal processes of the maxillae.

    • Inferiorly: Connect to the upper lateral cartilages of the nose.

    3. Structure

    Each nasal bone is a small, flat, rectangular bone with compact bone externally and cancellous bone internally:

    • External surface: Convex and covered by the nasal part of the procerus and nasalis muscles.

    • Internal surface: Concave and contributes to the formation of the nasal cavity roof.

    • Articulations: Each nasal bone articulates with four bones:

      • Opposite nasal bone (medially)

      • Frontal bone (superiorly)

      • Maxilla (laterally)

      • Perpendicular plate of the ethmoid bone (deeply)

    4. Function

    The nasal bones serve multiple structural and protective roles:

    • Form the nasal bridge: Provide bony structure to the upper part of the nose.

    • Support cartilage: Act as an anchoring site for the upper lateral cartilages and septal cartilage.

    • Protect internal structures: Shield the upper nasal cavity and underlying neurovascular structures from trauma.

    • Shape facial profile: Contribute significantly to nasal contour and overall facial symmetry.

    5. Physiological role(s)

    Although non-movable, the nasal bones support various physiological functions through their structural contributions:

    • Respiration: Help form the rigid framework that maintains nasal airway patency.

    • Olfaction: Indirectly support the nasal cavity which houses olfactory epithelium, crucial for the sense of smell.

    • Facial expression: Serve as attachment points for muscles involved in expressions like flaring the nostrils or wrinkling the nose.

    • Speech resonance: Contribute to shaping the nasal cavity, affecting voice resonance and clarity.

    6. Clinical Significance

    The nasal bones are among the most commonly injured facial bones and are significant in both trauma and reconstructive surgery:

    • Nasal bone fractures:

      • Most common facial bone fractures, typically resulting from blunt trauma (e.g., falls, sports, assaults).

      • Symptoms include nasal deformity, swelling, bruising, epistaxis (nosebleed), and impaired breathing.

      • May require closed reduction or rhinoplasty depending on severity and displacement.

    • Rhinoplasty considerations:

      • Cosmetic procedures often involve reshaping or repositioning nasal bones to alter nose profile and symmetry.

    • Congenital anomalies:

      • Hypoplastic nasal bones are associated with certain syndromes (e.g., Down syndrome) and can be detected via prenatal ultrasound.

    • Nasal obstruction:

      • Displaced or malformed nasal bones can contribute to chronic nasal blockage and may require surgical correction.

    Did you know? Your bones are constantly adapting to the mechanical forces placed on them.