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Osteology of Maxilla and Mandible Cheat Sheet by

Landmarks and Bones of upper and lower jaw
dentistry     maxillo-facial

Anatomy Review:

Skull:

22 bones (excluding ossicles of ear)
Bones attached by sutures (immov­able) and make up the cranium
Cran­ium: Upper part, surrounds cranial cavity
Facial Skelet­on: Lower ant. part
Calv­aria: Paired Temporal bones, Paired Parietal bones, Frontal, Sphenoid, Ethmoid and Occipital bones.
Faci­al: Paired Nasal bones, Paired Zygomatic bones, Paired Palatine bones, Paired Lacrimal bones, Paired Maxillae, Paired Inter Nasal Conchae and Vomer.
MANDIBLE = NOT PART OF CRANIUM OR FACIAL SKELETON

Skull Anatomy: Inferior View

 

Fore­head: Landma­rks

> Frontal Bone
> Suprac­iliary Arches
> Glabella
> Supra-­orbital Forame­n/notch
>Zy­gomatic process of Frontal Bone
> Frontal Process of Zygomatic Bone

Zygo­matic and Nasal Bones:

Lower lateral rim of orbit and lateral part of inferior rim of orbit = formed by Zygo­matic Bone
Land­mar­ks:
> Frontal Nasal Suture (formed by articu­lation of nasal bones)
> Nasion
> Frontal Process of Maxilla
> Piriform Apenture
> Nasal Crests
> Nasal Septum
> Anterior Nasal Spine
> Paired Inferior Nasal Conchae

Mandible: Medial View

Mandible: External Surface Lateral View

 

Mand­ible: Internal Surface

Mand­ible:

Most inferior structure in ant. view of skull
Consists of: Body (ant.) and Ramus (post) - these 2 meet at angle of mandible
Body: > Lower Part: base - has midline swelling (mental protub­erance) where 2 left and right sides meet. >­Upper part: Alveolar segment (contains teeth and tooth sockets)
Mental foramen: visible between upper and border, between 1st and 2nd premolars, openings on ext. surface, passage for mental nerves and blood vessels.
Oblique Ridge: passes from ramus onto body, point of attachment for muscles that depress lower lip.
Condyler Process: Involved in articu­lation of mand. w/ glenoid fossa and temporal bone.
Coronoid Process: Thin upward projec­tions on ant. surface of ramus, attachment for temporalis muscle
Mand­ibular Notch: Depress between coronoid processes and condyles
Mand­ibular Foramen: Opening on inner surface of body, allow passage of Alveloar nerves and blood vessels.
Ling­ula: Attachment for mandibular end of Spheno­man­dibular ligament
Mand­ibular Sympha­sis: Verticle midline fusion between 2 embryonic ossifi­cation centers (form body).
Mylo­hyoid Groove
Rami: Flattened, projected upwards
Angle: Where body joins ramus
 

Maxilla: Sagittal View

Maxilla: Medial Frontal view

Maxi­lla:

Part of face, between orbit and upper teeth
Upper jaw is formed by: Paired Maxillae
Contribute superiorly to inferior and medial rims of orbit
Zygomatic process = articu­lates with Zygomatic bone (medially)
Frontal process = articu­lates with frontal bone
Land­mar­ks:
> Body of Maxilla
> Infra Orbital Foramen
> Alveolar Process

Hard Palate:

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