facial bones

Facial Bones

• Nasal Bones (2)• Maxilla Bones (2)• Lacrimal Bones (2)• Zygomatic Bones (2)• Palatine Bones (2)• Inferior Nasal

Conchae (2)• Vomer• Mandible

Nasal Bones

• Together, form the bridge of the nose

Maxilla Bones

• Form:– Upper jaw– Anterior roof of mouth

(hard palate)– Floor of eye

socket(orbit)

• Contain sockets for upper teeth

Maxilla Bones

• Maxillary Sinuses: largest sinuses

Lacrimal Bones

• Front part of the medial orbit wall

• Between the maxilla and ethmoid bones

• House nasolacrimal ducts (tear ducts)

Zygomatic Bone

• Forms:– prominence of cheek– Part of lateral wall and

floor of orbit

Palatine Bones

• Form:– Posterior hard palate– Floor & lateral wall of

nasal cavity– Floor of orbit

• Affected with a cleft palate

Inferior Nasal Conchae

• Projections in lateral wall of nasal cavity

• Support mucous membranes– Warm, moisten, filter

air

• Increase surface area

Vomer

• Thin flat bone in medial plane

• Along with ethmoid, forms the nasal septum

Mandible

• Lower Jaw

• Largest and strongest bone of face

• Only movable bone of skull

• Houses lower teeth

Mandible

• Mandibular Condyle: articulates with temporal bone

• Coronoid Process: site of attachment for mastication muscles- protrudes when jaw is depressed

Fontanelles

• membraneous spaces between the skull bones of the fetus and infant where ossification is not complete.

• Permit compression at birth

• Skull bones are thin and flexible, so less easily broken

• aka “soft spot” in infants

Fontanelles

• Complete ossification of fontanelles occurs by age 26– Posterior closes by ~2 months– Sphenoid closes by ~ 3 months– Mastoid closes by ~ 1 year– Anterior closes ~end of 2nd year of life