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335 6.1 The Skull
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# of bones of skull
22 irregular shaped bones
sutures of the skull
sagittal
coronal
other characteristics of the skull
cranial and facial skeletons
orbits
nasal cavity
zygomatic arch
bones of the cranial skeleton
1 frontal
2 parietal
2 temporal
1 occipital
Sphenoid
Ethmoid
frontal bone forms
fore head and anterior part of the top of the cranium
frontal bone landmarks
supraorbital portion - superior surface of the eye sockets
zygomatic processes - point of articulation with zygomatic bones
coronal suture - unites the frontal bones with the paired parietal bones posteriorly
frontal bone articulates with
maxilla
nasal bone
lacrimal bones
zygomatic bones
ethmoid
parietal bones
sphenoid
maxilla bones
cheeks
nasal bone
bridge of nose
lacrimal bones
inner eye bones
refers to tears
parietal bones
paired, top side of cranium
parietal bones landmarks
sagittal suture - joins two parietal bones to one another
coronal suture - united frontal bone with parietal bones
squamous suture - joins temporal bones
lambdoidal suture - occipital bone
wormian bones - bifurcation of lambdoidal suture (not everyone has this)
parietal bones
each articulates with
opposite parietal bone
occipital
1 temporal bone
frontal
sphenoid
temporal bones
lower side of cranium and part of the floor
temporal lobe landmarks
squamous portion - fan shaped and thin portion; lower portion includes roof of the external auditory meatus
zygomatic process - projections that articulates with zygomatic bone
styloid process - bone extending down and forward; neck muscles and ligaments attach here
petrous portion - forms center section of cranial floor; very hard process which houses middle and inner ear structures
mastoid process - protuberance behind ear
temporal bones
each articulates with
occipital
1 parietal bone
sphenoid
1 zygomatic bone
mandible
occipital bone
posterior braincase
occipital bone landmarks
foramen magnum - hole through which spinal cordc enters cranial cavity
condyles - processes on ethier side of foramen magnum; articulate with the first cervical vertebra (Atlas)
basilar portion - articulates with sphenoid bone
occipital bone
articulates with
parietal bones
temporal bones
sphenoid
Atlas
sphenoid bone
in center of the skull
keystone of cranial floor
bat wing shaped
sphenoid bone landmarks
greater wings - lateral projections from body; form outer wall; articulate with frontal and temporal bones
lesser wings - thin projections; form posterior part
pterygoid processes - downward projections off of greater wings; form part of lateral nasal wall
sella turcica - saddle-shaped depression; contains pituitary gland
hamulus processes - projection off of medial pterygoid plate
optic foramen - transmits optic nerve (CN II)
superior orbital fissure - slitlike opening
foramen rotundum - maxillary branch of CN V
foramen ovale - mandibular branch of CN V
foramen spinosum - middle meningeal artery
pterygoid processes
medial (pterygoid plate) inner portion
lateral (pterygoid plate) outer projection
superior orbital fissure
transmits CN III, IV, and part of V and VI
sphenoid bone
articulates with
frontal
parietal bones
temporal bones
occipital
ethmoid
palatine bones
vomer
zygomatic bones
bones that DO NOT articulate one another
frontal bones and temporal bones
ethmoid bone
forms anterior cranial base
lies anterior to sphenoid and posterior to nasal bones
ethmoid bones landmarks
crista galli - protrudes into cranial space; meninges attach here
perpendicular plate - projection downward; makes up superior nasal septum
nasal conchae - superior; middle; form lateral walls of nose
cribiform plate - olfactory nerves pass through numerous holes in this plate; separates nasal and cranial cavities
ethmoid bone
articulates with
frontal
vomer
sphenoid
nasal bone
maxilla bones
lacrimal bone
palatine bones
inferior nasal conchae (2 separate bones)
Author
shanamd2010
ID
136469
Card Set
335 6.1 The Skull
Description
Skull Bones
Updated
2012-02-20T17:06:48Z
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