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Anatomy & Physiology The Skull
descriptions and some functions of structures in the skull
30
Anatomy
10th Grade
12/16/2008

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Term
FALSE; two
Definition
TRUE OR FALSE
The skull is composed of three sets of bones
Term
cranium
Definition
enclose and protect the fragile brain tissue
Term
facial bones
Definition
present the eyes in an anterior position and form thebase for the facial muscles
Term
sutures
Definition
most bones of the skull are joined by these interlocking joints
Term
mandible
Definition
attached to the rest of the skull by a freely movable joint
Term
mandible
Definition
lower jawbone
Term
frontal bone
Definition
anterior portion of cranium; forms foreheadm superior part of the orbit, and floor of anterior cranial fossa
Term
Supraorbital foramen (notch)
Definition
opening above each orbit allowing blood vessels and nerves to pass
Term
glabella
Definition
smooth area between the eyes
Term
parietal bone
Definition
postolateral to the frontal bone, forming sides of cranium
Term
sagittal suture
Definition
midline articulation point of the two parietal bones
Term
coronal suture
Definition
point of articulation of parietals with frontal bone
Term
temporal bone
Definition
inferior to parietal bone on lateral skull; can be divided into 4 major parts: the squamous region, tympanic region, mastoid region, & petrous region
Term
sqaumous region
Definition
abuts the parietals
Term
squamous suture
Definition
point of articulation on temporal bone with the parietal bone
Term
tympanic region
Definition
surrounds the external ear opening
Term
mastoid region
Definition
the area posterior to the ear
Term
petrous region
Definition
forms the lateral portion of the skull base
Term
zygomatic process
Definition
a bridgelike projection joining the cheekbone anteriorly. together these two bones form the " " arch
Term
mandibular fossa
Definition
rounded depression on the inferior surface of the zygomatic process (anterior to the ear); forms the socket for the madibular condyle, the point where the lower jaws joins the cranium
Term
external acoustic meatus
Definition
canal leading to eardrum and middle ear; tympanic region marking
Term
styloid process
Definition
needlelike projection inferior to external acoustic meatus; attachment point for muscles and ligaments of the neck; this process is often broken off demonstration skulls; tympanic region marking
Term
mastoid process
Definition
rough projection inferior and posterior to external acoustic meatus; attachment site for muscles
Term
mastoiditis
Definition
mastoid process is full of air cavities and so close to the middle ear-a trouble spot for infections- often becomes infected too, a condition referred to as...
Term
Definition
TRUE OR FALSE
The mastoid area is seperated from the brain by only a thin layer of bone
Term
meninges; meninigitis
Definition
an ear infection that has spread to the mastoid process can inflame the brain coverings, or... this condition is known as...
Term
occipital bone
Definition
most posterior bone of cranium-forms floor and back wall; joins sphenoid bone anteriorly via its narrow basioccipital region
Term
lambdoid suture
Definition
site of articulation of occipital bone and parietal bone
Term
foramen magnum
Definition
large opening in base of occipital, which allows the spinal cord to join with the brain
Term
sphenoid bone
Definition
bat-shaped bone forming the anterior plateau of the middle cranial fossa across the width of the skull
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