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Axial skeleton
anatomy lab
Question | Answer |
---|---|
skull | composed of two sets of boes: cranial bones and facial bones. All skull bones except the mandible are joined by immovable interlocking articulations called sutures |
frontal bone | forms forehead and superior portion of orbit |
parietal bone | forms a large portion of the lateral and superior aspect of the cranium on each side |
temporal bone | inferior to parietal bone |
external auditory meatus | external ear passageway leading to eardrum |
mastoid process | rounded eminence on the inferior surface, just posterior to the external auditory meatus, serves as attachment site for neck muscles |
styloid process | slende process extending downward from bottom of temporal bone. Attachment site for throat and neck muscles |
zygomatic process | slender process extending forward from the temporal bone. Forms part of the zygomatic arch |
mandibular fossa | oval shaped depression located just anterior to the external auditory meatus. Articulates with a condyle on the lower jaw to form the teporomandibular joint. |
shenoid | connected to frontal bone anteriorly and temporal bone posterioly. Forms part of the lateral side of the cranium and part of the posterior surface of the orbit |
occipital bone | forms posterior, inferior portion of the cranium |
foramen magnum | large hole in infeior surface. serves as a passageway for the spinal cord as it passes through the cranium to connect to the brain |
occipital condyles | rounded eminences located on each side of the foramen magnum. Articulate with fossae on the first cervical vertebra, the atlas |
coronal suture | between frontal bone and each parietal bone |
sagittal | where parietal bones meet at the midline |
squamosal | junction between inferior border of the parietal bone and superior border of the sphenoid and temporal bones |
lambdoidal | joins occipital bone to both parietal bones |
wormian bones | small islets of bone formed within a suture. most commonly found within the lambdoidal suture |
frontanels | the fetal skull at birth contains unossified membranous areas called frontanels, which allow compression of the skull during delivery. |
Ethmoid bone | forms a small portion of the anterior cranial floor, roof of the nasal cavity, upper portion of the nasal septum and part of the medial aspect of the orbit |
crista galli | vertical projectio. serves as point of attachment for the dura matter (outermost membrane covering the brain |
cribiform plate | lateral to the crista gall. Contains numerous holes for passage of olfactory nerves between the nasal cavity and the brain |
occipital bone | forms posterior portion of cranial floor. Contains foramen magnum |
maxilla | upper jaw |
palatine bones | unite at midline to form posterior 1/3 of hard palate |
zygomatic bone | cheek bone |
temporal process | long, slender process of temporal bone that fuses with the maxilla to form the zygomatic arch |
vomer | forms the inferior portion of the nasal septum. Aticulates with the perpendicular plate superiorly and hard palate inferiorly |
inferior nasal canchae | scroll shaped plates of bone protruding from lateral, inferior walls of the nasal cavity |
mandible | lower jaw. |
hypid bone | horse-shoe shaped bone inferior to the mandible. |
centrum (body) | load-bearing portion |
vertebral foramen | large hole in the center for passage of the spinal cord |
transverse processes | lateral projections. serve as attachment site for muscles |
spinous process | posterior projection. Serves as attachment for muscles |
lamina | portion between transverse and spinous process |
pedicle | portion between centrum and tranverse process |
superior and inferior articular facets | surfaces where vertebrea articulate with other vertebrae |
sternum | breastbone. composed of 3 bones fused together: manubrium, gladiolous and xiphoid process |
sternal extremity | flattened end. articulates with sternum |
vertebral extremity | end that articulates with thoracic vertebrae |
head | enlarged terminal portion of the vertebral extremity. articulates with centrum of thoracic vertebrae |
tubercle | small bump near head. articulates with the costal facet on the transverse process of a thoracic vertebrae |
neck | portion between head and tubercle |
costal groove | groove on inner, inferior edge |