FACIAL BONES ANATOMY
is additionally comprised of fourteen bones which make up the face.
The facial bones
do not touch the brain
but are still considered part of the skull.
Some cranial bones
meet with the facial bones to give each individual a varying form, the frame work from which the face is then built upon.
Additionally, facial bones provide an anchor for the teeth
and provide a structure for the muscles of the face and jaw to attach.
All bones of the face are structured in pairs, except the mandible and the vomer.
The maxillas, or maxillae when referencing two, join together at the center in order to form the upper jaw and provide structure for the upper teeth. The alveolar process is part of each individual maxilla, which anchors the molars, pre-molars, incisors
, and cuspids
FACIAL BONES DIAGRAM
Image: Facial Bones
The roof of the mouth
is formed by a hard plate known as the palatine process.
Just in front of this hard plate but behind the incisors lies the incisive foramen. The infraorbital nerve
and the artery that leads to the nose
pass through the infraorbital foramen, which fits snugly under each orbit
The inferior orbital fissure is the last opening within the maxilla. It creates the opening the allows passage of the maxillary nerve and the and the infraorbital vessels, and it is located between the sphenoid wing and the maxilla. The maxilla bone
also creates one of the four basic chambers
of the paranasal cavity, often referred to as the maxillary sinus
The palatine bones are responsible for contributing to the shape of the rear third of the roof of the mouth, a portion of the orbits, as well as a portion of the nasal
cavity. The hard palate
is made up in part by the horizontal plates of the palatine bone. The palatine foramen is located at the posterior angle and contributes to the formation of the greater palatine foramen which allows passage for the greater palatine nerve as well as the palatine vessels. The lesser palatine foramina follow the greater palatine foramina, creating a passageway which allows the lesser palatine nerves
to pass through.
PALATINE BONE DIAGRAM
Image: Palatine Bone
The zygomatic bones are commonly called the cheekbones, and they are responsible for forming the lateral contour of the facial structure. The zygomatic arch is formed by the meeting of the zygomatic process as well as temporal process which extends to meet with the zygomatic process. The lateral ridge of the orbit is also formed in part by the zygomatic bones. The zygomatic nerves and vessels are permitted passage through the zygomaticofacial foramen, which is on the surface of the bone.
ZYGOMATIC BONE DIAGRAM
Image: Zygomatic Bone
The lacrimal bones are thin bones that form the anterior portion of the medial walls of the individual orbits. These bones serve as structural additions for the eye sockets. The tiniest of all the facial bones, each individual lacrimal bone contains a groove that assists in forming the nasolacrimal canal. This groove is known as lacrimal sulcus. The nasolacrimal canal is the passageway in the facial bones which allows the tears from the eye to drain into the nasal cavity.
LACRIMAL BONE DIAGRAM
Image: Lacrimal Bone
At the midline, in nearly the center of the facial structure, a small triangular formation of nasal bones forms the basic structure for the nose. The bones do not extend fully forward, as most of the nose is constructed from cartilage, however this bone formation lays the foundation for the cartilage to extend from as well as forms a solid structured opening to allow for an airway. The nasal bones simply support the plates of cartilage which form the nose. Fractures
to the nose are often fractures of the cartilage as it is very difficult to experience impact that would break the nasal bones.
NASAL BONE DIAGRAM
Image: Nasal Bone
INFERIOR NASAL CONCHA
The fragile bones in the shape of a scroll that reside in the lateral walls of the nasal cavity are covered in mucous membranes in order to help warm and moisten the oxygen inhaled through the nostrils. The inferior nasal choncha are similar to the other concha, but are smaller and project horizontally and medially from the walls of the nasal cavity. They protrude below both the superior and middle nasal conchae of which belong to the ethmoid bone
. All three sets of concha bones cleanse the air as it enters the nasal cavity.
INFERIOR NASAL CONCHA DIAGRAM
Image: Inferior Nasal Concha
The vomer is one of only two bones in the face that is a solitary bone, lacking an identical, opposing bone on the opposite side of the face. Forming the lower section of the septum, this bone is flat and nearly paper thin. In conjunction with the perpendicular plate of the ethmoid bone, it is responsible for assisting in the support of the septal cartilage. The septal cartilage is part of the formation of the front and inside portions of the nasal septum.
The mandible is the largest of all the facial bones and is the only bone of the facial bones that has the ability of movement. The mandible is able to create movement such as this through two joints
which attach it to the skull known as temporomandibular joints. The body of the mandible, which is comprised of the front and sides, creates the shape of a horseshoe. Two rami extend from the mandible at the exterior portion. Each individual ramus contains a knoblike condylar processes that are located reside at the superior margin. The condylar process meets the mandibular fossa of the temporal bone
. A pointed coronoid process extends to allow for attachment of the temporalis muscle. The mandibular notch is the depressed area that exists between the two processes. At the corner of the jaw, where the vertical ramus and the horizontal body meet, is the angle of the mandible.
Two sets of foramina, the mental foramen and the mandibular foramen, allow for the passage of nerves. The mental foramen is located on the mandible at the anterolateral aspect of the body of the mandible. This is located before the first molar. The mandibular foramen is located on the medial surface of the ramus. The mental foramen allows the passage of the mental nerve and the mandibular foramen allows for passage of the inferior alveolar nerves and vessels.
There are a variety of muscle which attach from the skull to the mandible to allow for the movement of the jaw. The mandible is design to hold the 16 lower teeth that align with the 16 upper teeth supported by the skull.
The hyoid bone is a very unique bone, solitary in design, and is the only bone in the human body that does not attach in any form to any other bone. The hyoid bone is located below the mandible and is suspended in the neck by the styloid process, which is part of the temporal bone, as well as the stylohoid muscles
and ligaments. The hyoid bone consists of its body, two posteriorly projecting greater cornua which attach to the ligaments, and two lesser cornua which extend toward to anterior. The hyoid bone is responsible for the support necessary for the tongue
as well as serving as an attachment point for some of the tongue’s muscles. If a thumb and forefinger is placed on the neck, under the lateral portions of the mandible, and a gentle pressure is applied, the hyoid bone can be palpated. This little bone almost always breaks during strangulation and is a vital piece of information when performing an autopsy.
HYOID BONE DIAGRAM
Image: Hyoid Bone
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