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Information about Orbital Surface Of The Body Of The Maxilla

Bone: Orbital surface of the body of the maxilla
Left maxilla. Outer surface.
subject #38 158
The orbital surface is smooth and triangular, and forms the greater part of the floor of the orbit.

It is bounded medially by an irregular margin which in front presents a notch, the lacrimal notch; behind this notch the margin articulates with the lacrimal, the lamina papyracea of the ethmoid and the orbital process of the palatine.

It is bounded behind by a smooth rounded edge which forms the anterior margin of the inferior orbital fissure, and sometimes articulates at its lateral extremity with the orbital surface of the great wing of the sphenoid.

It is limited in front by part of the circumference of the orbit, which is continuous medially with the frontal process, and laterally with the zygomatic process.

Near the middle of the posterior part of the orbital surface is the infraorbital groove, for the passage of the infraorbital vessels and nerve. The groove begins at the middle of the posterior border, where it is continuous with that near the upper edge of the infratemporal surface, and, passing forward, ends in a canal, which subdivides into two branches.

One of the canals, the infraorbital canal, opens just below the margin of the orbit; the other, which is smaller, runs downward in the substance of the anterior wall of the maxillary sinus, and transmits the anterior superior alveolar vessels and nerve to the front teeth of the maxilla.

From the back part of the infraorbital canal, a second small canal is sometimes given off; it runs downward in the lateral wall of the sinus, and conveys the middle alveolar nerve to the premolar teeth.

At the medial and forepart of the orbital surface just lateral to the lacrimal groove, is a depression, which gives origin to the Obliquus oculi inferior.

Additional images


The seven bones which articulate to form the orbit.




This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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Bones of head and neck: the face
maxillaBody of maxilla - Maxillary sinus - surfaces of body Anterior (Incisive fossa, Canine fossa, Infraorbital foramen, Anterior nasal spine) - Infratemporal (Alveolar canals, Maxillary tuberosity) - Orbital (Infraorbital groove, Infraorbital canal) - Nasal (Pterygopalatine canal) - processes Zygomatic process - Frontal process (Agger nasi, Anterior lacrimal crest) - Alveolar process - Palatine process (Incisive foramen, Incisive canals, Foramina of Scarpa, Premaxilla, Anterior nasal spine)
lacrimalPosterior lacrimal crest - Lacrimal groove
zygomaticOrbital process, Zygomaticofacial foramen - Zygomaticotemporal foramen - Zygomaticorbital foramina
palatinePterygopalatine fossa - Pterygoid fossa - Horizontal plate (Posterior nasal spine) - Perpendicular plate (Pterygopalatine canal, Sphenopalatine foramen, Pyramidal process)
processes (Orbital - Sphenoidal)
mandiblebody (Symphysis menti, Mental protuberance, Mental foramen, Mylohyoid line) - Ramus (Mandibular foramen, Mylohyoid groove, Mandibular canal, Angle, Coronoid process, Condyloid process, Mandibular notch)
othersnasal bone - inferior nasal conchae (ethmoidal process, maxillary process) - vomer
In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated.

It can also mean the skin which surrounds the eye of a bird.

In the adult human, the volume of the orbit is 30 ml, of which the eye occupies 6.5 ml.
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The orbital process of the palatine bone is placed on a higher level than the sphenoidal, and is directed upward and lateralward from the front of the vertical part, to which it is connected by a constricted neck. It presents five surfaces, which enclose an air cell.
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The lateral wall and the floor of the orbit are separated posteriorly by the inferior orbital fissure which transmits the maxillary nerve and its zygomatic branch, the infraorbital vessels, and the ascending branches from the sphenopalatine ganglion.
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The frontal process of the maxilla (nasal process) is a strong plate, which projects upward, medialward, and backward, by the side of the nose, forming part of its lateral boundary.
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The zygomatic process of the maxilla (malar process) is a rough triangular eminence, situated at the angle of separation of the anterior, zygomatic, and orbital surfaces.
  • In front it forms part of the anterior surface.

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Near the middle of the posterior part of the orbital surface of the maxilla is the infraorbital groove (or sulcus), for the passage of the infraorbital vessels and nerve.
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The infraorbital artery is an artery in the head that runs in the maxilla, emerging just under the orbit of the eye.

Course

The infraorbital artery appears, from its direction, to be the continuation of the trunk of the maxillary artery, but often arises in conjunction
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infraorbital nerve. This nerve innervates the lower eyelid, upper lip, and part of the vestibule and exits the infraorbital foramen of the maxilla.

See also

  • infraorbital artery
  • external nasal nerve

Additional images


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One of the canals of the orbital surface of the maxilla, the infraorbital canal, opens just below the margin of the orbit.

See also

  • Infraorbital foramen

External links

  • Description at uams.

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The anterior superior alveolar arteries originate from the infraorbital artery; they supply the upper incisors and canines; they also supply the mucous membrane of the maxillary sinus.
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The anterior superior alveolar branch (anterior superior dental branch), of considerable size, is given off from the maxillary nerve just before its exit from the infraorbital foramen; it descends in a canal in the anterior wall of the maxillary sinus, and divides into
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The maxillary sinus (or Antrum of Highmore) is the largest of the paranasal sinuses, and is pyramidal in shape.

General characteristics

Found in the body of the maxilla, this sinus has three recesses: an alveolar recess pointed inferiorly, bounded by the alveolar
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The middle superior alveolar nerve is a nerve that drops from the infraorbital portion of the maxillary nerve to supply the sinus mucosa, the roots of the maxillary premolars, and the mesiobuccal root of the first molar.
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The premolar teeth or bicuspids are transitional teeth located between the canine and molar teeth. In humans, there are two premolars per quadrant, making eight premolars total in the mouth. They have at least two cusps.
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The Obliquus oculi inferior (inferior oblique) is a thin, narrow muscle, placed near the anterior margin of the floor of the orbit.

Action

Its actions are lateral rotation, elevation and abduction of the eye.
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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Bones are rigid organs that form part of the endoskeleton of vertebrates. They function to move, support, and protect the various organs of the body, produce red and white blood cells and store minerals.
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Head and neck anatomy focuses on the structures of the head and neck of the human body, including the brain, bones, muscles, blood vessels, nerves, glands, nose, mouth, teeth, tongue, and throat.
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The face is the front part of the head, in humans from the forehead to chin including the hair, forehead, eyebrow, eyes, nose, cheeks, mouth, lips, philtrum, teeth, skin, and chin. The face is used for expression, appearance and identity amongst others.
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The maxilla (plural: maxillae) is a fusion of two bones along the palatal fissure that form the upper jaw. This is similar to the mandible, which is also a fusion of two halves at the mental symphysis.
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The body of the maxilla is somewhat pyramidal in shape, and contains a large cavity, the maxillary sinus (antrum of Highmore).

It has four surfaces - an anterior, a posterior or infratemporal, a superior or orbital, and a medial or nasal.
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The maxillary sinus (or Antrum of Highmore) is the largest of the paranasal sinuses, and is pyramidal in shape.

General characteristics

Found in the body of the maxilla, this sinus has three recesses: an alveolar recess pointed inferiorly, bounded by the alveolar
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The anterior surface is directed forward and lateralward. It presents at its lower part a series of eminences corresponding to the positions of the roots of the teeth. Just above those of the incisor teeth is a depression, the incisive fossa, which gives origin to the Depressor
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incisive fossa, which gives origin to the Depressor alæ nasi; to the alveolar border below the fossa is attached a slip of the Orbicularis oris; above and a little lateral to it, the Nasalis arises.
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infraorbital foramen, the end of the infraorbital canal; it transmits the infraorbital artery, vein, and infraorbital nerve.

External links

  • Norman/Georgetown cranialnerves ( V )
  • SUNY Labs 29:os-0506 (closeup)
  • SUNY Figs

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anterior nasal spine.

Additional images



Side view of the skull.

Roof, floor, and lateral wall of left nasal cavity.

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The infratemporal surface is convex, directed backward and lateralward, and forms part of the infratemporal fossa.

It is separated from the anterior surface by the zygomatic process and by a strong ridge, extending upward from the socket of the first molar tooth.
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The infratemporal surface of the maxilla is pierced about its center by the apertures of the alveolar canals, which transmit the posterior superior alveolar vessels and nerves.

This article was originally based on an entry from a public domain edition of Gray's Anatomy.
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