Chap 5: Bones of Skull & Facial #1, & Suture Review

How many total facial bones do we have?

14

Parietal

2; one on each side of the skull; just behind the frontal bones; anterior to the occipital bone

Foramen Magnum

A large opening at the base of the skull through which the brain connects to the spinal cord.

Eight cranial bones

Frontal bone Parietal bones (2) Occipital bone Temporal bones (2) Sphenoid bone Ethmoid bone

fontanels

Gaps between a baby's skull that slowly close up during the first 18 months of life. These form sutures as you age.

Mandible

Lower jaw bone; largest and strongest bone of the face.

Temporal

Side of skull; posterior to zygomatic (actually holds zygomatic process; anterior to occipital

Sagittal suture

Where right and left parietal bones meet superiorly; between the parietal bones From lambdoid suture to coronal suture

Coronal suture

articulation between the parietal bones and frontal bone; suture that makes a crown on the head

Occipital

base of skull forms the back of the skull and base of cranium; posterior to parietal bone; most posterior bone of cranium

Frontal

bones that form forehead; anterior portion above eyes; articulates posteriorly with the parietal bones via the coronal suture

Sphenoid

butterfly-shaped bone that spans the width of the middle cranial fossa. Forms the central wedge that ARTICULATES (touches) ALL OTHER CRANIAL BONES.

Maxillary

facial keystone bones that articulate with all other facial bones EXCEPT the mandible.

Sutures of the brain

immovable junctions of fibrous tissue; connection point between skull bones; Includes: coronal, sagittal, lambdoidal, lateral (squamous). The coronal joins the frontal bone to the parietal bones, the squamous joins the parietal bones to the temporal bones, the lambdoid joins the parietal bones to the occipital bone and the sagittal suture joins the two parietals together at the top of the skull.

Lacrimal

innermost bone of face; holds tear duct; small fragile bones that forms the front inner walls of eye socket.

Zygomatic

irregularly shaped bones (cheekbones) that form the prominences of the chees and the inferior and lateral margins of the orbits (eyes)

UNPAIRED bones of the face

mandible, vomer

Bones of the FACE

maxilla, zygomatic, nasals, lacrimals, palatines, inferior conchae, mandible, and vomer

four flat bones of the skull

parietal (paired), frontal, frontal, occipital

four flat bones of the skull

parietal (paired), frontal, temporal, occipital

Lambdoidal

separates occipital from parietal and temporal bones

Sagittal

suture that separates the two parietal bones

Squamous (lateral) suture

where parietal and temporal bones meet

Lambdoid suture

where parietal bones meet the occipital bones posteriorly

PAIRED bones of the face

• Maxilla bone • Zygomatic bones: form lateral wall of orbits • Lacrimal bones: located in the medial orbital walls • Nasal bones: form bridge of nose • Inferior nasal conchae: thin, curved bones that project medially and form the lateral walls of the nasal cavity • Palatine bones: complete the posterior part of the hard palate