Opening Location StructureOrbital opening 5/6 of the eyeballSupraorbital notch Superior margin Supraorbital/ foramen nerves/vesselsInfraorbital Floor/orbital Infraorbital nervegroove and canal plate of maxilla and blood vesselsNasolacrimal Medial wall Nasolacrimal ductcanal
Opening Location StructureInferior Orbital Between maxilla and 1. Maxillary nerveFissure greater wing of and its sphenoid zygomatic branch 2. Inferior Opthalmic vein 3. Sympathetic nerves
Opening Location StructureSuperior Orbital Between greater and 1. Lacrimal N.Fissure lesser wings of 2. Frontal N. sphenoid 3. Trochlear N. 4. Occulomotor N. (upper and lower divisions) 5. Abducent N. 6. Superior Opthalmic Vein
Opening Location StructureAnterior Ethmoidal Frontal Bone 1. Nasociliary N.Foramen 2. Anterior Ethmoidal V. A. and N.Posterior Frontal Bone 1. PosteriorEthmoidal Foramen Ethmoidal V., A. and N.Optic Canal Lesser Wing of 1. Optic N. Sphenoid 2. Opthalmic N.
Superior Wall1. Anterior – nasal bone -nasal process of the frontal bone2. Middle - cribriform plate of ethmoid bone3. Posterior - body of the sphenoid
Median Wall- Perpendicular plate of ethmoid- Vomer.
Lateral Wall1. Contain turbinates or conchae which are bony elevations made up of: a. Superior and middle conchae of the ethmoid bone b. Inferior nasal conchae or turbinates2. Bounded by the posterior nares3. Contain meatuses between nasal conchaes.
The Paranasal SinusesThese are pneumatic bones surrounding the nasal cavity.Functions:1. Lighten the bone of the skull2. Resonating chambers.
Meatuses and Sinus Drainage of the Lateral Wall of the Nasal Cavity Meatus Sinus DrainageSupreme or highest nasal Sphenoidal sinusmeatus or spheno-ethmoidal recessSuperior Nasal Meatus Posterior ethmoidal sinus
Meatuses and Sinus Drainage of the Lateral Wall of the Nasal Cavity Meatus Sinus DrainageMiddle nasal meatus Anterior and middle ethmoidal sinus; frontal sinus; and maxillary sinusInferior nasal meatus Nasolacrimal duct
- forms the prominence of a cheek, contributes to the lateral orbital wall and floor, parts of the walls of temporal and infratemporal fossae and completes the zygomatic arch.- roughly quadrangular with anteromedial and frontal processes.- It can be described as having three surfaces, five borders and two processes.
Lateral View of the Zygomatic BoneThe Three Processes ofthe Zygomatic Bone:1. Temporal process2. Frontal process3. Maxillary process
1. Anterolateral Surface-is convex and pierced near itsorbital border by thezygomaticofacial foramen (forthe zygomaticofacial nerve andvessels); below this zygomaticusminor and, posteriorly,zygomaticus major areattached.
2. Posteromedial Temporal Surface- has a rough anterior area for articulation with the maxilla and a smooth, concave posterior area extending up posteriorly on its frontal process as the anterior aspect of the temporal fossa.
3. Orbital Surface- smooth and concave, is the anterolateral part of the orbital floor and adjoining lateral wall, extending up on the medial aspect of its frontal process.
Foramen Location StructureZycomatico-facial Below the lateral zygomatigo- 1.foramen part of the lower facial branch margin of the of the orbit Zygomatic N. 2. Lacrimal A.Zygomatico- Temporal process Zygomatico-temporal foramen of the zygomatic temporal N. and bone blood vessels
Opening r Location StructureMental foramen Between the apices of Mental nerve the mandibular premolarsAlveolar processes Upper border of the Roots of mandibular mandible teethMandibular foramen Lingual side of the Mandibular N. ramus of the mandible