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Maxilla

The maxilla (or maxillary bone, upper jaw bone, Latin: maxilla) is a paired bone of the facial skeleton, and it has a body and four processes. The two maxillary bones (maxillae) are fused in the midline by the intermaxillary suture to form the upper jaw.

Overview of maxilla (anterior view)
Overview of maxilla by Anatomy.app
Overview of maxilla
Overview of maxilla by Anatomy.app
Overview of maxilla
Overview of maxilla by Anatomy.app
Skull, maxilla colored, body of maxilla and processes
Maxilla by Anatomy.app
Maxilla (colored) inside of skull, maxillary sinus, palatine process, anterior nasal spine
Maxilla (nasal surface) by Anatomy.app

 

Parts of maxilla

Each maxilla has five parts, including the body of the maxilla and four processes:

Parts of maxilla (overview)
Parts of maxilla (overview) by Anatomy.app
Parts of maxilla (anterior view)
Parts of maxilla (anterior view) by Anatomy.app
Parts of maxilla (posterior view)
Parts of maxilla (posterior view) by Anatomy.app
Parts of maxilla (medial view)
Parts of maxilla (medial view) by Anatomy.app
Parts of maxilla (lateral view)
Parts of maxilla (lateral view) by Anatomy.app
Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Anterior view
Maxilla (anterior view) by Anatomy.app
Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Medial view
Maxilla (medial view) by Anatomy.app
Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Posterior view
Maxilla (posterior view) by Anatomy.app

 

Body of maxilla

The body of the maxilla is the central portion of the bone housing the maxillary sinus and supporting the four mentioned processes of the maxilla. The body of the maxilla has four surfaces: anterior, orbital, nasal, and infratemporal surfaces.

Surfaces of body of maxilla
Surfaces of body of maxilla by Anatomy.app
Maxilla, parts and anatomical landmarks, three aspects (posterior view, lateral view, medial view)
Maxilla (posterior view, lateral view, medial view) by Anatomy.app

The anterior surface of the body features the following structures:

  • Nasal notch
  • Infra-orbital margin
  • Infra-orbital foramen
  • Canine fossa

The nasal notch is a curved margin of the bony anterior nasal aperture. And the infraorbital margin is the lower margin of the orbit formed partly by the maxilla, and partly by the zygomatic bone.

The infraorbital foramen is an opening on the anterior aspect of the maxilla located below the infraorbital margin. It is the outer opening of the infraorbital canal that serves as the passage for the infraorbital nerve (a branch of the maxillary nerve (CN V2)), accompanied by the infraorbital artery and vein.

The canine fossa is a depressed area on the anterior surface of the body located below the infraorbital foramen. The canine fossa is the origin site of the levator anguli oris muscle.

Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Body of maxilla, Anterior surface, Anterior view
Anterior surface of maxilla by Anatomy.app

The orbital surface of the body of the maxilla forms most of the floor of the orbit and features the infraorbital groove leading into the infraorbital canal. This canal ends with an opening on the anterior surface of the maxilla and serves as the passage for the infraorbital nerve and blood vessels, as mentioned before.

Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Body of maxilla, Orbital surface, Anterolateral view
Orbital surface of maxilla (anterolateral view) by Anatomy.app
Orbital surface of maxilla
Orbital surface of maxilla (superior view) by Anatomy.app

The nasal surface of the body of the maxilla forms part of the lateral wall of the nasal cavity and features a large defect or opening - the maxillary hiatus. The maxillary hiatus is an opening to the maxillary sinus, located below the middle nasal concha. The maxillary sinus is a paranasal sinus, an air-filled cavity located within the body of the maxilla.

Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Body of maxilla, Nasal surface, Medial view
Nasal surface of maxilla by Anatomy.app

The infratemporal surface of the body of the maxilla features the maxillary tuberosity with alveolar foramina that lead into the alveolar canals. The maxillary tuberosity (or maxillary eminence) is a rounded eminence at the lower part of the infratemporal surface. It is the origin site for a few fibers of the medial pterygoid muscle.

Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Body of maxilla, Infratemporal surface, Posterior view
Infratemporal surface of maxilla by Anatomy.app

The alveolar foramina are several small openings on the maxillary tuberosity leading into the alveolar canals - several small bony passages - that transmit the posterior superior alveolar nerves (branches of the maxillary nerve (CN V2)) and posterior superior alveolar arteries and veins to the upper teeth.

 

Processes of maxilla

Each maxilla is composed of five parts. Besides the central part known as the body, the maxilla has the following four processes:

Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Processes of maxilla, Anterior view
Processes of maxilla (anterior view) by Anatomy.app
Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Processes of maxilla, Medial view
Processes of maxilla (medial view) by Anatomy.app

The frontal process is an extension of the maxilla projecting upward, medially and backward for articulation with the frontal bone. The frontal process of the maxilla features the lacrimal groove. Situated on the frontal process of the maxilla and the lateral surface of the lacrimal bone the lacrimal groove participates in forming the nasolacrimal canal. It houses the nasolacrimal duct.

Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Processes of maxilla, Frontal process, Landmarks of frontal process, Anterior view, Medial view
Frontal process of maxilla by Anatomy.app

The zygomatic (malar) process of the maxilla is the lateral extension of the bone for articulation with the zygomatic bone. Posterior part of this process is concave and participates in forming the infratemporal fossa. Anteriorly, it forms part of the anterior surface of the maxilla.

Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Processes of maxilla, Lateral view
Processes of maxilla (lateral view) by Anatomy.app

The palatine process of the maxilla is an extension of the maxillary bone shaped as a horizontal plate forming the largest part of the hard palate. The opening of the incisive canal can be found on the palatine process. It starts as a paired canal from the floor of the nasal cavity and unites with the palate in the uniform incisive fossa. From each incisive canal ascends the terminal branch of the greater palatine artery, and descends the nasopalatine nerve.

Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Processes of maxilla, Palatine process, Landmarks of palatine process, Inferior view
Palatine process of maxilla by Anatomy.app

An alveolar process is a crested process of the upper or lower jaw which houses the teeth. The curved free margin of the alveolar process is called the alveolar arch. The alveolar arch of the maxilla (as the alveolar arch of the mandible) features the following structures:

  • Dental alveoli
  • Interalveolar septa
  • Interradicular septa
  • Alveolar yokes

The dental alveoli are sockets in the alveolar process where the roots of the teeth lie. The dental alveoli of the mandible house the roots of the lower teeth, while the dental alveoli of the maxilla - the upper teeth.

Head and neck, Skull, Viscerocranium, Facial skeleton, Maxilla, Upper jaw, Landmarks of maxilla, Processes of maxilla, Alveolar process, Landmarks of alveolar process, Inferior view, Anterior view
Alveolar process of maxilla by Anatomy.app

The interalveolar septa are bony ridges between adjacent dental alveoli. But the interradicular septa are bony ridges forming compartments in dental alveoli for the roots of the teeth in both the upper and lower jaw bones.

The alveolar yokes (or juga alveolaria) are eminences on the outer surfaces of the jaw bones produced by the projections of the dental alveoli. They can be seen on alveolar processes of both the maxilla and the mandible.