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    Related Topics

    From Musculoskeletal System

    Buccinator
    Muscle that helps with chewing and blowing air out.
    Soleus
    Calf muscle responsible for plantarflexion of the foot.
    Interspinous Ligament
    Spinal ligament between adjacent vertebral spinous processes.
    Inferior Nasal Conchae
    Bones inside the nasal cavity that filter and humidify air.
    Latissimus Dorsi
    Back muscle responsible for arm adduction and extension.
    Rectus Abdominis
    Abs muscle that flexes the trunk.
    Biceps Tendon
    Tendon that attaches the biceps muscle to the bone.
    Flexor Tendons
    Tendons that help flex the fingers and toes.
    Temporalis
    Muscle involved in closing the jaw.
    Gliding (Plane) Joints
    e.g., between carpals
    Glenohumeral Ligaments
    Shoulder ligaments that stabilize the shoulder joint.
    Ligamentum Flavum
    Spinal ligament connecting the laminae of adjacent vertebrae.
    Gomphoses
    Fibrous joints where a peg fits into a socket (e.g., teeth in jaw).
    Skull
    Bony structure of the head that encases the brain.
    Vomer Bone
    Bone forming the nasal septum.
    Lacrimal Bones
    Bones forming part of the eye socket and housing the tear ducts.
    Maxillae
    Upper jaw bones that house the teeth and form part of the orbit.
    Parietal Bones
    Bones forming the sides and roof of the skull.
    Femur
    Thigh bone, the longest and strongest bone in the body.
    Quadriceps Tendon
    Tendon that connects the quadriceps to the patella.
    Ellipsoidal (Condyloid) Joints
    e.g., wrist
    Patellar Tendon
    Tendon connecting the patella to the tibia.
    Extensor Tendons
    Tendons that help extend the fingers and toes.
    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.
    Ischium
    Part of the pelvis that supports weight while sitting.

    Zygomatic Bones

    Reviewed by our medical team

    Cheekbones that form part of the orbit.

    1. Overview

    The zygomatic bones are paired facial bones that form the prominent part of the cheeks and contribute to the lateral wall and floor of the orbit. Often referred to as the “cheekbones,” they are key structural components of the midface and play a critical role in facial aesthetics, articulation with surrounding bones, and protection of orbital contents.

    2. Location

    The zygomatic bones are located on the lateral aspect of the midface:

    • Lateral to: The maxilla and nasal bones.

    • Inferior to: The frontal bone and lateral margin of the orbit.

    • Anterior to: The temporal bone, with which it forms the zygomatic arch.

    Each zygomatic bone articulates with four bones: the frontal, maxilla, sphenoid, and temporal bones.

    3. Structure

    Each zygomatic bone has a robust and quadrangular shape, with several important features:

    • Orbital surface: Forms part of the lateral wall and floor of the orbit.

    • Temporal surface: Faces posteriorly to form part of the zygomatic arch.

    • Maxillary surface: Articulates with the maxilla, contributing to the infraorbital rim.

    • Zygomatic arch: Formed by the zygomatic process of the temporal bone and temporal process of the zygomatic bone; serves as a bridge between face and skull.

    • Zygomaticofacial foramen: Allows passage of the zygomaticofacial nerve and vessels to the skin of the cheek.

    4. Function

    The zygomatic bones serve several structural and functional roles:

    • Facial contour: Provide the prominence of the cheeks and define facial width and aesthetics.

    • Orbital protection: Form part of the orbit and help shield the eye from lateral impact.

    • Muscle attachment: Serve as attachment sites for facial expression muscles (e.g., zygomaticus major and minor).

    • Bridge to cranium: Link facial bones with the neurocranium via the zygomatic arch.

    5. Physiological role(s)

    Though the zygomatic bones are not directly involved in metabolic functions, they contribute indirectly to important physiological roles:

    • Facial muscle coordination: Facilitate facial expressions such as smiling and speaking.

    • Mechanical load transfer: Distribute masticatory forces from the maxilla to the cranial base through the zygomatic arch.

    • Support of orbital structures: Maintain orbital geometry essential for proper ocular alignment and vision.

    6. Clinical Significance

    Zygomatic bones are frequently involved in facial trauma and reconstructive surgery:

    • Zygomatic fractures:

      • Often result from blunt trauma (e.g., sports injuries, vehicle accidents).

      • May cause flattening of the cheek, trismus (jaw movement limitation), diplopia (double vision), or infraorbital nerve injury.

    • Tripod fracture:

      • A common type of zygomatic complex fracture involving three points: zygomatic arch, orbital floor, and maxillary articulation.

      • Often requires surgical realignment and fixation.

    • Zygomaticomaxillary complex (ZMC) fracture:

      • Involves the zygomatic bone and its articulations; affects aesthetics and function.

    • Cosmetic and reconstructive relevance:

      • Important in procedures involving midfacial augmentation or repair after trauma or congenital deformity.

    • Infections and tumors:

      • Though rare, the zygomatic bone may be affected by osteomyelitis, fibrous dysplasia, or metastatic lesions.

    Did you know? Your feet contain 26 bones.