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