Axial Skeleton Flashcards
forehead
frontal bone
superior ridge of the eye socket
supraorbital margin
the ridge of the eye socket, indicating the location of the frontal sinus
superciliary arch
triangular part on the forehead
glabella
cavity within frontal bone
frontal sinus
pair flat bone on superior portion of skull
parietal bone
runs between frontal and parietal bones
coronal suture
runs between parietal bones
sagittal suture
paired bone on lateral side of skull
temporal bone
runs between temporal bone and parietal bone
squamous suture
articulates with condylar process of mandible
mandibular fossa
articulation of the mandibular fossa and condylar process
temporomandibular joint
opening in the temporal bone extending to inner ear
external auditory meatus
dense bony ridge on interior surface of temporal bone, location of middle and inner ear cavities
petrous part
short canal in petrous part of the temporal bone, extending laterally towards the inner ear
internal auditory meatus
long sharp process of the temporal bone extending inferiorly, like a stylus
styloid process
rounded process of the temporal bone posterior to the styloid process and extending inferiorly
mastoid process
located between the styloid and mastoid processes, passageway for facial nerve
stylomastoid foramen
located on petrous part of the temporal bone anterior to the jugular foramen, anterior to mastoid and styloid process
carotid canal
located on inferior petrous part of the temporal bone posterior to the carotid canal
jugular foramen
arch of bone extending anteriorly from the temporal bone
zygomatic process
paired bone which participates with the zygomatic process, cheek bones
zygomatic bone
arch of bone extending posteriorly from the zygomatic bone
temporal process
formed by union of the zygomatic bone and zygomatic process of temporal bone
zygomatic arch
most posterior and inferior bone of the skull
occipital bone
runs transversely joining the occipital and parietal bone
lambdoid suture
median protrusion on the occipital bone posterior and superior to foreman magnum
external occipital protuberance
runs horizontally from external occipital protuberance
superior nuchal line
diagonal extension of the superior nugal line towards the mastoid process
lateral superior nuchal line
large opening on the inferior part of the skull
foramen magnum
paired rounded process lateral to the foramen magnum
occipital condyle
paired canal superior to occipital condyle
hypoglossal canal
region of the occipital bone anterior to foramen magnum,
basilar part
butterfly-shaped bone forming the floor of the cranium
sphenoid bone
posterior and inferior to lesser wing on interior of the skull, also visible in the posterior orbit and lateral side of the skull
greater wing
anterior and superior to greater wing on the interior skull
lesser wing
fissure between greater and lesser wings of sphenoid visible from the orbits, upper fissure
superior orbital fissure
fissure in the orbit floor between maxilla and greater wing of sphenoid, lower fissure
inferior orbital fissure
saddle-like depression posterior to lesser wing
sella turcica
paired cavity located within the sphenoid, inferior to the sella turcica
sphenoid sinus
paired opening through lesser wing of the sphenoid
optic canal
paired opening at the posterior margin of the sphenoid
foramen spinosum
paired opening lateral to the base of the sella turcica
foramen ovale
paired opening lateral to the sella turcica
foramen lacerum
paired opening anterior to the foramen ovale
foramen rotundum
sharp process that laterally and inferiorly project from the sphenoid
lateral pterygoid plate
sharp process that medially and inferiorly projects from the sphenoid
medial pterygoid plate
irregular bone with a cranial suture surrounding it
sutural bone
located between the orbits and between sphenoid and nasal bones, forms roof of nasal cavity
ethmoid bone
superior projection on the middle of the cribriform plate
crista galli
porous bone surrounding the crista galli in the floor of the cranium through which olfactory nerves pass
cribriform plate
numerous cavities within the ethmoid bone
ethmoid sinus
median inferior projection of the ethmoid, forms superior nasal septum
perpendicular plate
bone forming the inferior and posterior portion of the nasal septum
vomer
paired internal openings of the nasal cavity on either side of the vomer
choanae
bone that protrudes into the inferior part of the nasal cavity, also known as the inferior turbinate bone
inferior nasal concha
posterior bone of the hard palate
palatine bone
paired fused bone of the upper jaw and central face
maxilla
paired cavity found within the maxilla
maxillary sinus
paired opening inferior to the orbit
infraorbital foramen
anterior portion of the hard palate
palatine process
bony portion of the roof of the mouth, includes palatine bone and palatine process of the of the maxilla bone
hard palate
paired bone composing the superior portion (bridge) of the nose
nasal bone
paired bone forming part of the medial wall of the orbit
lacrimal bone
opening in the lacrimal bone
nasolacrimal canal
lower jaw
mandible
most anterior part extending horizontally to the angle of the mandible
body
where the body and ramus of the madible meet
angle
vertical portion of the mandible extending from the angle
ramus
anterior process of the ramus
coronoid process
the most posterior process of the ramus of mandible, which contributes to the temporomandibular joint
condylar process
separates the coronoid from the condylar process
mandibular notch
paired opening on the medial surface of the ramus
mandibular foramen
protrusion in the center of the chin indicating fusion of the two mandibular bodies
mental protuberance
socket lined with connective tissue in which a tooth is fastened
alveolus
projection of the maxilla and mandible where tooth sockets are located
alveolar margin
U-shaped bone in the neck superior to the larynx
hyoid bone
fibrocartilage cushions between the vertebral bodies
intervertebral disc
basic bone unit of the vertebral column
vertebra
anterior portion of the vertebra
body
opening posterior to vertebral body through which the spinal cord passes
vertebral foramen
posterior projection from vertebral body that supports the lamina
pedicle
lateral projections of the vertebra for muscle/ligament attachment
transverse process
paired arches supported by the pedicles located posterior to the vertebral body
lamina
most posterior projection of the vertebra for muscle/ligament attachement
spinous process
paired (superior and inferior) process which articulates with process of adjacent vertebrae
articular process
smooth surface of articular process
articular facet
Total 7, neck region, smalles vertebrae
cervical vertebrae
paired opening on the transverse process
transverse foramen
C1 supports head
atlas
C2 serves as pivotal point for atlas and skull
axis
process of the axis which passes through the vertebral foramen of the atlas
dens
Total 12, vertebrae that connect to ribs, articular facets face forward, not towards each other
Thoracic vertebrae
depression on transverse process, articulates with the tubercle of the ribs
costal facet
half facet on superior and inferior edges of each vertebral body, articulates with head of ribs
costal demifacet
Total 5, biggest vertebrae, articular facets face inward towards each other.
Lumbar vertebrae
Total 5 fused vertebrae forming posterior wall of pelvis
sacrum
lateral part that articulates with the os coxa through the sacroilac joint of pelvis
auricular surface
fused posterior spinous process of sacral vertebrae
median sacral crest
openings on the posterior side of the sacrum
posterior sacral foramina
openings on the anterior side of the sacrum
anterior sacral foramina
4 fused vertebrae forming the triangular “tail bone”
coccyx
anterior midline anchor for the ribs, composed of three bones
sternum
superior portion of the sternum that articulates with the clavicle at its clavicular notch
manubrium
important anatomical landmark located in the superior portion of the manubrium
jugular notch
middle portion of the sternum that articulates with T2-T7 cartilage
body
paired site on the sternum for attachment of costal cartilage
costal notch
small inferior portion of the sternum
xiphoid process
connective tissue that connects the ribs and the sternum
costal cartilage
12 pairs (24 total)
ribs
7 of these ribs, attach to T1-T7
true ribs
5 of these, all attach indirectly to the sternum also connected to T8-T12
false ribs
2 of these, do not attach to sternum at all, T11-T12
floating ribs
rounded part of rib which articulates with the costal demifacet on the body of the thoracic vertebrae
head
region between the head and the tubercle of the rib
neck
prominence near the head of the rib which articulates with the costal facet located on the transverse processes of thoracic vertebrae
tubercle
curved portion of the rib
angle
elongated part of the rib associated anteriorly with costal cartilage
shaft
groove on the inferior side of the rib shaft
costal groove