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A&P Lab pgs23-27
Skull
62
Anatomy
Undergraduate 1
10/20/2012

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Term
frontal
Definition
bone responsible for the shape of the forehead and contributes to the upper part of the eye socket (i.e. orbit)
Term
supraorbital margin
Definition
the upper margin of the eye socket
Term
anterior cranial fossa
Definition
bilateral depressions in the floor of the anterior portion of the skull; can be observed in a skull whose top is removable
Term
parietals
Definition
form much of the lateral wall and part of the roof of the skull
Term
temporals
Definition
form the floor for much of the middle cranial fossa and sides of the skull; projects forward to compose part of the zygomatic arch
Term
squamous portion
Definition
flat portion of temporal bone above the ear
Term
zygomatic process
Definition
slender process extending forward from squamous portion to contribute to the zygomatic arch
Term
middle cranial fossa
Definition
bilateral depressions in the floor of the middle portion of the skull; can be observed in a skull whose top is removable
Term
mastoid process
Definition
large prominence extending down behind ear; contains mastoid air sinus internally
Term
petrous or petrosal part
Definition
inward extension of temporal bone; best seen in skulls where top is removable; surrounds middle and inner ears
Term
internal auditory meatus
Definition
passageway for nerves and vessels that supply the ear
Term
styloid process
Definition
pointed projection below ear; often broken in dry skulls
Term
mandibular fossa
Definition
depression in temporal bone in front of external auditory meatus; for articulation with the mandible
Term
zygomatics or malars
Definition
form the prominent parts of the upper cheeks and can be felt on yourself just below the orbits; forms the anterior portion of the zygomatic arch
Term
occipital
Definition
single bone which forms the posterior part and a portion of the base of the skull
Term
foramen magnum
Definition
large opening in the lower part where medulla of the brain joins the spinal cord
Term
occipital condyles
Definition
two oval prominences on either side of the foramen magnum; articulate with the first cervical vertebra, the atlas
Term
posterior cranial fossa
Definition
bilateral depressions in the floor of the posterior portion of the skull; can be observed in a skull whose top is removable
Term
sphenoid
Definition
has the general resemblence to a bat in shape; helps to form the posterior portion of the orbitals
Term
body
Definition
hollow, cube-like central portion of the sphenoid bone
Term
wings of sphenoid
Definition
lateral projections from the body (lesser and greater)
Term
sella turica
Definition
obvious central depression seen on the upper surface of the sphenoid; the depression is saddle-shaped; the pituitary gland lies in this depression
Term
optic foramen
Definition
on either side and in front of the sella turica; for passage of the optic nerve coming from the eye
Term
ethmoid
Definition
very delicate single bone found in the anterior portion of the skull
Term
cribiform or horizontal plate
Definition
sieve-like portion of the skull (filled with small holes) which is seen from above in the cut skull; weakest part of the skull
Term
olfactory foramina
Definition
small holes in the cribiform plate through which branches of the olfactory nerve pass on their way to the brain
Term
crista galli
Definition
sharp process extending up from cribiform plate in the midline
Term
perpendicular plate
Definition
downward extension of the ethmoid bone; forms part of the bony nasal septum
Term
turbinates (conchae)
Definition
help form lateral walls of nose; flare out into nasal passageway to cause turbulance in airflow; mucus membranes sit on these; there are 3 on each side, a superior, middle, and inferior (the inferior is a separate bone)
Term
nasals
Definition
form the bridge of the nose; in living individuals, cartilage extends distally from these bones
Term
lacrimals
Definition
small delicate bones seen in the medial wall of the orbit; each has a groove for the tear duct which carries tears to the nasal cavities
Term
vomer
Definition
plowshare-shaped bone which, along with the perpendicular plate of the ethmoid, forms part of the nasal septum
Term
mandible
Definition
bone of the lower jaw
Term
body of mandible
Definition
main anterior part of mandible; forms the chin
Term
ramus
Definition
projects upward from posterior part of the body of the mandible
Term
condyle (head)
Definition
part of each ramus that articulates with the mandibular fossa of temporal bone
Term
mandibular foramen
Definition
hole on inner surface of ramus; transmits nerves and blood vessels to lower jaw
Term
mental foramen
Definition
on lateral aspect of the body of mandible; for nerve and vessels
Term
alveolar process
Definition
portion of the mandible and the maxillae at the border continous with the teeth
Term
incisors
Definition
front 4 teeth
Term
canines
Definition
pointed "eye" teeth
Term
premolars
Definition
first 2 broad teeth behind canines
Term
molars
Definition
broad teeth behind the premolars
Term
maxillae
Definition
bones of the upper jaw
Term
palatine process
Definition
inward projection from alveolar process; forms the largest portion of the hard palate at the roof of the mouth
Term
palatines
Definition
2 bones forming the posterior portion of the hard palate ("L" shaped)
Term
hyoid bone
Definition
single horseshoe-shaped bone that lies in front of the neck; does not form joints with any other bone (boyfriend bone)
Term
auditory ossicles
Definition
3 bones located in each middle ear and are involved with sound transmission
Term
malleus
Definition
hammer; attached to eardrum and next bone
Term
incus
Definition
anvil; attached to next bone
Term
stapes
Definition
stirrup; attached to inner ear
Term
sutures
Definition
immovable joints responsible for holding the skull bones together and for allowing bone growth
Term
coronal suture
Definition
suture between frontal and parietal bones
Term
lambdoidal suture
Definition
suture between the occipital and 2 parietal bones
Term
sagittal suture
Definition
suture between 2 pariental bones
Term
squamosal suture
Definition
suture between the temporal bone and several others such as the occipital, parietal, and sphenoid
Term
fontanels
Definition
soft spots in the skull of a newborn
Term
anterior or frontal fontanel
Definition
fontanel in area where the coronal suture meets the sagittal suture
Term
posterior or occipital fontanel
Definition
fontanel in area where lambdoidal suture meets the sagittal suture
Term
antero-lateral or sphenoid fontanel
Definition
fontanel in area where parietal, temporal, frontal, and sphenoid bones all meet; or where the coronal suture meets the sphenoid bone
Term
postero-lateral or mastoid fontanel
Definition
fontanel where the lambdoidal and squamosal suture meet each other
Term
coronoid process
Definition
projection upward from anterior part of each ramus
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