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    Related Topics

    From Musculoskeletal System

    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.
    Wormian Bones
    Sutural bones in the skull.
    Cervical Vertebrae (C1 - C7)
    Vertebrae in the neck region (C1-C7).
    Lateral Collateral Ligament (LCL)
    Knee ligament that stabilizes the outer knee.
    Fibula
    Smaller bone in the lower leg, located alongside the tibia.
    Pivot Joints
    e.g., atlanto-axial joint
    Symphyses
    Cartilaginous joints where bones are connected by fibrocartilage.
    Obliques (External and Internal)
    Muscles responsible for torso rotation.
    Temporalis
    Muscle involved in closing the jaw.
    Ilium
    Uppermost and largest part of the hip bone.
    Metacarpals (5 bones)
    5 bones forming the palm of the hand.
    Ball-and-Socket Joints
    e.g., shoulder, hip
    Quadriceps
    Rectus Femoris, Vastus Medialis, Vastus Lateralis, Vastus Intermedius.
    Extensor Tendons
    Tendons that help extend the fingers and toes.
    Levator Ani
    Pelvic floor muscle responsible for lifting the anus.
    Sacroiliac Ligaments
    Ligaments connecting the sacrum to the iliac bones.
    Occipital Bone
    Bone forming the back and base of the skull.
    Parietal Bones
    Bones forming the sides and roof of the skull.
    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.
    Lacrimal Bones
    Bones forming part of the eye socket and housing the tear ducts.
    Vomer Bone
    Bone forming the nasal septum.
    Acromioclavicular Ligament
    Ligament that connects the acromion to the clavicle.
    Zygomaticus
    Muscle that raises the corners of the mouth.
    Scapula
    Shoulder blade providing attachment for muscles of the upper limb.
    Sartorius
    Longest muscle in the body responsible for hip flexion.

    Facial Bones

    Reviewed by our medical team

    Bones forming the structure of the face.

    1. Overview

    The facial bones are a group of fourteen bones that form the skeleton of the face. These bones provide the structure and shape of the face, protect vital sensory organs, and serve as attachment sites for facial muscles. Unlike cranial bones, which primarily protect the brain, facial bones contribute to the formation of the orbits, nasal cavity, oral cavity, and jaw. Some of these bones are paired, while others are singular in the midline.

    2. Location

    Facial bones are located in the anterior and inferior parts of the skull, below the cranial cavity:

    • Superiorly: Articulate with the frontal bone of the cranium.

    • Inferiorly: Include the mandible, the only movable bone in the skull.

    • Laterally: Form the cheeks and parts of the eye sockets.

    • Medially: Form the nasal cavity and septum.

    3. Structure

    There are fourteen facial bones in total, which include:

    • Paired bones (right and left):

      • Maxillae: Form the upper jaw and part of the hard palate, nose, and orbit.

      • Zygomatic bones: Form the cheeks and part of the lateral orbital wall.

      • Nasal bones: Form the bridge of the nose.

      • Lacrimal bones: Small bones in the medial wall of the orbit; house the nasolacrimal duct.

      • Palatine bones: Form the posterior part of the hard palate and part of the nasal cavity and orbit.

      • Inferior nasal conchae: Scroll-like bones that project into the nasal cavity and help with airflow and humidification.

    • Unpaired bones:

      • Vomer: Forms the inferior portion of the nasal septum.

      • Mandible: The lower jawbone; the only movable facial bone, articulating with the temporal bone at the temporomandibular joint.

    These bones are connected by sutures, except for the mandible, which has a mobile synovial joint.

    4. Function

    Facial bones serve multiple structural and protective functions:

    • Support facial structures: Provide the framework for the face, including the nose, cheeks, and jaws.

    • Protect sensory organs: Surround and safeguard the eyes, nasal passages, and oral cavity.

    • Anchor muscles: Serve as attachment sites for facial expression, mastication, and speech-related muscles.

    • Facilitate eating and breathing: Form the upper and lower jaws, nasal cavity, and parts of the oral cavity.

    5. Physiological role(s)

    The facial bones contribute to several physiological processes:

    • Mastication: The maxilla and mandible support the teeth and enable chewing through their articulation and muscle attachments.

    • Respiration: The nasal bones, vomer, and inferior nasal conchae help form and regulate the nasal airway.

    • Vision and lacrimation: The zygomatic, lacrimal, and maxillary bones form the orbital socket and support the tear drainage system.

    • Speech and expression: The mandible and associated bones enable jaw movement for speech, while facial muscles attached to these bones allow for expressions and communication.

    • Growth and development: Facial bones grow and remodel during childhood and adolescence, influencing overall facial appearance and dental alignment.

    6. Clinical Significance

    Disorders and injuries involving facial bones have important clinical implications:

    • Fractures:

      • Common in trauma; zygomatic, nasal, and maxillary fractures can cause facial asymmetry, impaired vision, or airway obstruction.

      • Le Fort fractures involve patterns of maxillary fractures and are categorized into three types.

    • Temporomandibular joint (TMJ) dysfunction:

      • Results from malalignment or degeneration of the mandibular condyle and affects chewing and speaking.

    • Cleft palate and cleft lip:

      • Congenital anomalies of the maxilla and palatine bones causing oronasal communication and feeding difficulties.

    • Sinusitis:

      • Maxillary and ethmoidal sinuses within facial bones can become inflamed due to infection or allergy.

    • Orthodontic and surgical interventions:

      • Facial bones are frequently altered in reconstructive surgery, dental implants, and orthognathic procedures.

    Did you know? Your bones make up only 15% of your body weight.