Bones+Cavities Unit 3

All bones but mandible rigidly joined by?

sutures

skull divided into

facial skeleton and cranium

facial skeleton forms?

framework for organs of mastication, speech, respiration, muscles of facial expression

cranium houses and protects

brain

mandible

begins as paired bone with a symphysis

fuses early in development to become single bone

landmarks of mandible

mental foramen, alveolar arch, angle, ramus, coronoid process, condylar process, corpus

maxillae

paired bone that forms upper jaw

contributes to formation of:

root of mouth

floor and lateral walls of nasal cavity

floor of orbit

roughly pyramidal shaped body with 4 processes

maxillae processes

zygomatic, frontal, palatine, alveolar

maxillae includes

pre-maxillary suture, incisive foramen, inter-maxillary suture, transverse palatine suture

nasal bones

two small oblong plans

placed side by side, form bridge of nose

lie medial to frontal processes of maxillae

articulate with frontal bone, maxillae, other nasal bone

palatine bones

small, but complex

contribute to floor and lateral wall of nasal cavity

posterior ¼ of hard palate

floor of orbit

palatine bone landmarks

horizontal plate

perpendicular plate

inferior nasal conchae

small, scroll-like bones

makes up inferior-most aspect of lateral wall of nasal cavity

articulates with maxilla, palatine, and ethmoid bones

vomer

inferior half of bony nasal septum

articulates with maxillae, palatine, sphenoid, and ethmoid bones

anterior border articulates with cartilaginous septum

zygomatic bones

cheekbone

along with zygomatic process of maxilla and temporal bone, form zygomatic arch

roughly quadrilateral body with 3 processes: maxillary, temporal, frontal

lacrimal bones

form lateral nasal wall and small portion of medial orbit

ethmoid

regarded as cranial bone but contributes to facial skeleton

projects down between orbital plates of frontal bone

contributes to walls of orbit and nasal

ethmoid landmarks

crista galli

cribform plate

perpendicular plate

conchae (superior and middle)

sphenoid bone

located at base of skull, behind ethmoid, and in front of foramen magnum

bat with wings

articulates with all bones of cranium and 3 facial bones

sphenoid bone landmarks

body

lesser wings

greater wings

pterygoid plates including haulus

frontal bone

forms anterior part of brain case

vertical plate contributes to forehead

horizontal plate contributes to roof of orbit and nasal cavities

frontal bone landmarks

nasal portion

zygomatic process

orbital process

parietal bones

form most of rounded roof of cranium

articulates with frontal bone at coronal suture

joined together at sagittal suture

articulates with occipital bone at lamboid suture

occipital bone

lower and back portion of cranium

occipital bone landmarks

foramen magnum

occipital condyles, articulate with superior facets of C1

temporal bones

paired bones at forming most of lateral base and sides of brain case

temporal bone squamous portion

lateral, anterior, superior aspect of bone

includes EAM, mandibular fossa

zygomatic process- with temporal process of zygomatic bone, forms of zygomatic arch

temporal bone tympanic portion

in front of mastoid process and below squamous and petrous portions

forms anterior and inferior part of EAM

includes styloid process

temporal bones petrous portion

at base of skull

houses essential organs of hearing, and equilibrium

temporal bone mastoid portion

posterior portion