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Boyer diss 2009 1046..

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ps –<br />

s1 –<br />

s2 –<br />

s3 –<br />

tca –<br />

posterior septum (and internal carotid canal): laterally curving septum of bone<br />

that shields the fenestra cochlea dorsally and holds a canal that leads to the<br />

posterior carotid foramen ventrally<br />

first (anterior) septum: most lateral septum extending anteriorly from<br />

promontorium (tubal canal forms between s1 and epitympanic crest)<br />

second (medial secondary) septum: forms medial to s1, projects anteromedially<br />

from promontorium. g3 typically leads to the ventral or medial aspect of this<br />

septum<br />

third septum: Projects medially between s2 and raised ridge of cochlear<br />

canaliculus, more posteriorly<br />

tympanic canaliculus: Foramina and groove on or near ridge of cochlear<br />

canaliculus in tympanic cavity marking the entrance of the tympanic nerve from<br />

extracranial space, and the re-entrance of the nerve into the promontorium as it<br />

moves laterally to contribute to the tympanic plexus. Associated canals do not<br />

communicate with cochlea.<br />

216

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