SKELETAL: AXIAL SKELETON Flashcards
how many bones does the skull have
22 bones
house and protect the brain
cranial bone or cranium
immovable bones are called
sutures
top of the skull is called the
calvaria
connected to the two parietal bones
frontal bone
suture that connects parietal and frontal bone
coronal suture
superior border of each of the orbits contains a _ ; allows passage of a blood vessel and nerve for the eyelid and eye
supraorbital foramen or notch
between two orbits is the smooth region of the bone called
glabella
what sinus does the frontal bone contain
frontal sinus
the frontal bone forms the _ which supports lobes of the brain
anterior cranial fossa
two parietal bones are joined by what suture?
sagittal suture
parietal bones are connected to the occipital bone by what suture
lambdoid suture
temporal bones are connected by the skull by the
squamous sutures
this part of the temporal bone meets the parietal bone
squamous part
it joins to form the what arc? (bridge across the side of the skull)
zygomatic arch
the zygomatic process has an oval-shaped fossa on the inferior side called the
mandibular fossa
this part of the temporal bone has the prominent external auditory canal (transmits sound waves toward the eardrum, or tympanic membrane)
tympanic part
this part of the temporal bone extends inward toward the center of the skull
petrous part
located on the posterior surface of the petrous part and is the opening for a nerve controlling hearing and balance
internal auditory canal
large bony inferior projection that can be seen and felt just posterior to the external ear
mastoid process
cavities inside the mastoid process
mastoid air cells
when mastoid air cells become infected it causes
mastoiditis
projects from the lower portion of the petrous part of the temporal bone ; serves as attachment site for three muscles
styloid process
located between the styloid process and mastoid process and allows for passage of a nerve controlling facial muscles
stylomastoid foramen
three important foraminas:
jugular
carotid
foramen lacerum
allow jugular veins to carry majority of the blood away from the brain
jugular foramina
major entry point for blood delivery to the brain
carotid
easily noticeable opening in a dried skull at the border of the petrous part and the sphenoid bone
foramen lacerum
makes up the majority of the skull’s posterior wall and base
occipital bone
most prominent feature of the occipital bone, the opening were the brainstem connects to the spinal cord
foramen magnum
this region forms the _ that support the cerebellum of the brain
posterior canal fossae
two rounded projections on either side of the foramen magnum
occipital condyles
points of attachment for several neck muscles that move the head
nuchal line
single bone that extends completely across the skull (resembles a butterfly)
sphenoid bone
shape of the prominence formed within the floor of cranial cavity
sella turcica
within the body of the sphenoid bone are the
sphenoidal tissues
located on each side of the sphenoidal bone just anterior to the sella turcica
optic canal
the lateral portions of the sphenoid bone form the
middle cranial fossa
where cranial nerves controlling eye movement enter the orbit
superior orbital fissure
porous, fragile bone centrally located in the skull
ethmoid bone
large portion of the nasal cavity
nasal septum
sinuses within the ethmoid bone form the
ethmoidal sinuses
prominent ridge of the ethmoid bone
crista galli
houses one of the two olfactory bulbs that transmit signals for the sense of smell
cribriform plates
cribriform plates contain numerous foramina called
olfactory foramina
extending inferiorly from the ethmoid bone is a central, thin, bony plate called the
perpendicular plate
two scroll shaped bones protruding medially from the ethmoid bone
conchae
openings within particular bones that open into the nasal cavity
paranasal sinuses
cone shaped fossae
orbits
rounded opening anteriorly and is separated into right and left halves by the nasal septum
nasal cavity
how many bones are in the face
14 bones
commonly known as cheekbones, anterior to sphenoid bones
zygomatic bones
anterior and inferior to the zygomatic bones ; fused in the center
maxilla
have horizontal plates that fuse centrally to form the posterior portion of the hard palate
palatine bones
smallest of the skull bones and house the depression through which the nasolacrimal duct enters the canal
lacrimal bones
form the bridge of nose
nasal bones
only skull bone that is freely movable
mandible
forms most of the posterior of the nasal septum
vomer
one of the three conchae in the nasal cavity
inferior nasal concha
important for speech and swallowing
hyoid bone
located in the vertebral column region with the greatest range of motion
cervical vertebrae
support the majority of the body’s wieght
lumbar vertebrae
located between two hip bones
sacrum
referred to as tailbone
coccyx
commonly called the rib cage ; contains the heart
thoracic cage
breastbone ; describe as sword shaped
sternum