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Axial skeleton bones

[WIP]

QuestionAnswer
What are the three subdivisions of the axial skeleton ? The skull, the thoracic cage, and the spinal column.
What are the two subdivisions of the skull bones ? How many bones are in each category ? Facial (14) and cranial (8). Note that the cranial bones form the 'braincase.'
What are the eight cranial bones ? Which are paired ? The parietal (paired), the temporal (paired), the frontal, the occipital, the sphenoid, and the ethmoid.
What are the parietal bones ? Upper lateral braincase. Paired superiorly. Bounded anteriorly by the frontal bone, inferiorly by the temporals, and posteriorly by the occipital.
What are the temporal bones ? Lower lateral braincase. Bounded posteriorly and inferiorly by the occipital - not directly joined to one another.
What is the frontal bone ? Upper anteriror braincase (forehead, frontal region). Forms supraorbital margin and superior portion of orbit.
What is the occipital bone ? Lower posterior braincase and posterior base of skull. Includes an external protuberance and superior nuchal line (in line with the ears) which marks the upper-limit of the neck muscles (the nape). Forms ALL of the foramen magnum and occipital condyles.
What is the sphenoid bone ? Anterior inferior braincase; 'on the inside.' Wings extend anteriolaterally. Note the sella turca and the pituitary fossa therein. Forms inferior portion of the walls of the nasal cavity via the pterygoid (wing-like) plates.
What is the ethmoid bone ? Inferior anteriomedial braincase. Forms roof of nasal cavity, nasal concha (x3) and cribiform plate containing nasal nervous foramina. Note the crista galli (a superior protrusion) which anchors the dura mater anteriorly. Note also the mass of OoS sinuses
Created by: melopoe
 

 



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