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Starts w/Major Bones of Skull

Paranasal or Sphenoid Sinuses (pair)

4 pairs of cavities in the bones around nasal cavity Behind maxillae

Pterygoid Processes

project down from body of Sphenoid, just behind Maxillae. Med. & Lat. Pter. plates.

Maxillary sinuses

largest, most troublesome of paranasal sinuses. Form thin wall of bone btw roots of maxillary posterior teeth & sinus spaces themselves.

anterior nasal spine

Small projection of maxillae at the bottom of the nasal aperture. Lower end, front nasal cavity. (landmark often used in ortho. xrays)

Alveolar eminences

some anter. teeth n premolars cause these bulges.

Maxillary Tuberosity

behind Maxillae 3rd molars. Posterior bulge of bone. Blood vessels, nerves enter bone to supply posterior teeth n part of maxill. sinus, much growth of maxil. takes place.

Insufficient growth of Maxillary Tuberosity

inadequate room for wisdom teeth to erupt & Maxil. may be shorter than should be. Mandible looks more forward, cause Class III occlusion.

Hiatus or Ostium of maxillary sinus

opening into nasal cavity, varies in size. Medial view of Maxillae.

lacrimal groove

runs down from inner corner of eye. Tears flow into nose=runny nose when crying!

Ramus

inferior mandible

Mental Protuberance

tip of chin area

Condylar neck

slightly narrowed area just beneath condyle of mandible, which articulates with temporal bone to make TMJ

Coronoid or Mandibular Notch

Depression in Ramus, in front of condyle.

Coronoid Process

Bony projection at upper anterior ramus of mandible; point of attachment for temporal muscle. Just anterior to Cor. Notch.

External Oblique Line

anterior border of ramus ends here. Shows up as radiopacity on posterior periapical or pantographic radiographs.

Mandibular Foramen

midway up ramus, nerves and blood vessels for lower teeth & lip enter mandible

Mylohyoid line

Just in front of the foramen, running forward & down. Attachment for Myloh. muscle

Sublingual & Submandibular fossae

2 depressions in bone, toward anterior part of Myloh. line-one above, one below the line. Glands lie in these depressions.

Retromolar Triangle

Behind Mandible 3rd molars. (denture construction, landmarks)

External Oblique Line

Lateral margin of R. Triangle

Internal Oblique Line

Medial margin of R. Triangle

Superior & Inferior Genial Tubercles or Mental Spines

2 small, grouped projections at midline, one above, one below. Attachments for muscles that aid in tongue movement & swallowing - Genioglossus, Geniohyoid.

Lingula

"little tongue" Projection of bone partially covers opening of mandibular foramen.

Digastric Fossae

just below Genial projections at inferior border of mandible. Pts of attachment for anterior digastric muscle.

Sphenomandibular Ligament

Lingula is pt of attachment. Location & size may affect success of anesthetic injections in area.

How many bones form the skull?

22

How are the bones subdivided?

Neurocranium, Viscerocranium

Which bones form the hard palate?

Palatal process of maxilla, Palatal process of palatine bone

Another name for each:
A.Coronal
B. Sagittal
C. Lambdoid

A. Frontoparietal
B. interparietal
C. parietooccipital

Where is largest paranasal sinus?

Maxillae

Name area behind Maxillary 3rd molars

Maxillary Tuberosity

Divisions of Mandible?

Body, Alveolar process, Ramus

Where is Sphenoid Sinus?

Paranasal sinuses, within the body, just behind Maxillae.

What bones make up rim of orbit?

Frontal, Maxillae, Zygomatic

Nasal Septum=

Ethmoid (upper) + Vomer (lower)

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