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    Related Topics

    From Musculoskeletal System

    Inferior Nasal Conchae
    Bones inside the nasal cavity that filter and humidify air.
    Glenohumeral Ligaments
    Shoulder ligaments that stabilize the shoulder joint.
    Cervical Vertebrae (C1 - C7)
    Vertebrae in the neck region (C1-C7).
    Wormian Bones
    Sutural bones in the skull.
    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.
    Ethmoid Bone
    Bone forming part of the nasal cavity and the orbit.
    Coccygeus
    Pelvic floor muscle supporting the coccyx.
    Pubis
    Part of the pelvis that joins with the opposite side to form the pubic symphysis.
    Anterior Cruciate Ligament (ACL)
    Knee ligament that stabilizes the joint.
    Biceps Brachii
    Muscle responsible for elbow flexion.
    Sartorius
    Longest muscle in the body responsible for hip flexion.
    Hinge Joints
    e.g., elbow, knee
    Ilium
    Uppermost and largest part of the hip bone.
    Palatine Bones
    Bones forming part of the hard palate and nasal cavity.
    Thoracic Vertebrae (T1 - T12)
    Vertebrae in the upper and mid-back (T1-T12).
    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.
    Ligamentum Flavum
    Spinal ligament connecting the laminae of adjacent vertebrae.
    Quadriceps
    Rectus Femoris, Vastus Medialis, Vastus Lateralis, Vastus Intermedius.
    Acromioclavicular Ligament
    Ligament that connects the acromion to the clavicle.
    Scapula
    Shoulder blade providing attachment for muscles of the upper limb.
    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.
    Metacarpals (5 bones)
    5 bones forming the palm of the hand.
    Occipital Bone
    Bone forming the back and base of the skull.
    Flexor Tendons
    Tendons that help flex the fingers and toes.

    Maxillae

    Reviewed by our medical team

    Upper jaw bones that house the teeth and form part of the orbit.

    1. Overview

    The maxillae are a pair of bones that form the upper jaw and a major portion of the facial skeleton. They play a key role in supporting the upper teeth, forming the orbit of the eye, the walls of the nasal cavity, and the hard palate. The two maxillae fuse at the midline during development, creating the foundation for much of the midface. These bones are critical for functions such as mastication, respiration, speech, and facial aesthetics.

    2. Location

    The maxillae are located in the central part of the facial skeleton:

    • Superiorly: Contribute to the floor of the orbits (eye sockets).

    • Inferiorly: Form the roof of the oral cavity and house the upper dental arch.

    • Medially: Border the nasal cavity and articulate with the opposite maxilla at the intermaxillary suture.

    • Laterally: Articulate with the zygomatic bones (cheekbones).

    3. Structure

    Each maxilla is an irregularly shaped bone made up of a body and four processes:

    • Body of the maxilla: Contains the maxillary sinus, a large air-filled cavity.

    • Frontal process: Projects upward to articulate with the frontal bone.

    • Zygomatic process: Extends laterally to meet the zygomatic bone.

    • Alveolar process: Contains sockets (alveoli) for the upper teeth.

    • Palatine process: Projects horizontally to form the anterior three-quarters of the hard palate.

    Important anatomical features:

    • Infraorbital foramen: Transmits the infraorbital nerve and vessels.

    • Canine fossa: A depression just above the canine tooth.

    • Maxillary sinus: The largest paranasal sinus, within the body of the maxilla.

    4. Function

    The maxillae serve multiple structural and functional purposes:

    • Support the upper teeth: The alveolar processes hold the upper dental arch in place.

    • Form key facial structures: Contribute to the nose, orbit, and mouth architecture.

    • Anchor facial muscles: Serve as attachment points for muscles of facial expression and mastication.

    • Facilitate air flow and speech: Help construct the oral and nasal cavities and hard palate.

    5. Physiological role(s)

    The maxillae play important roles beyond bone structure:

    • Respiration: Form the floor of the nasal cavity and house the maxillary sinuses, which warm and humidify inhaled air.

    • Speech production: Help form the roof of the mouth and nasal passages essential for proper resonance and articulation.

    • Growth and development: Guide the eruption of teeth and the development of the midface during childhood and adolescence.

    • Facial contour and aesthetics: Influence the prominence of the cheeks, nasal base, and upper lip support.

    6. Clinical Significance

    The maxillae are involved in various clinical conditions and surgical considerations:

    • Maxillary fractures:

      • Common in facial trauma; Le Fort fractures describe classic fracture patterns involving the maxilla (I, II, and III).

      • Can lead to occlusion issues, sinus disruption, and cosmetic deformity.

    • Cleft palate and cleft lip:

      • Congenital defects due to improper fusion of the maxillary processes; require surgical correction.

    • Maxillary sinusitis:

      • Infection or inflammation of the maxillary sinus can cause facial pain, nasal congestion, and referred dental discomfort.

    • Dental implications:

      • Tooth loss, infections, or abscesses in the upper teeth can affect the maxillary bone and sinus.

      • Implant placement in the maxilla may require sinus lift procedures.

    • Orthognathic surgery:

      • Maxillary repositioning may be performed for malocclusion, facial asymmetry, or obstructive sleep apnea.

    Did you know? Your thumb has two phalanges, whereas other fingers have three.