Norma Basalis OBJECTIVES At the end of this lecture, students will ...
Norma Basalis OBJECTIVES At the end of this lecture, students will ...
Norma Basalis OBJECTIVES At the end of this lecture, students will ...
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Posterior Part<br />
• Formed principally by occipital bone<br />
• Mastoid process<br />
– Mastoid notch on medial side <strong>of</strong> each process, for posterior belly<br />
<strong>of</strong> digastricus<br />
– Occipital groove medial to mastoid notch, for occipital artery<br />
• Styloid process<br />
– Medial & slightly anterior to mastoid processes<br />
• Stylomastoid foramen<br />
– <strong>At</strong> base <strong>of</strong> styloid process<br />
– Facial nerve exits toward side <strong>of</strong> face, & stylomastoid artery<br />
enters to tympanic cavity.<br />
•<br />
• Jugular foramen<br />
– Medial to styloid process & posterior to carotid canal<br />
– Anterior compartment – inferior petrosal sinus<br />
– Intermediate – glossopharyngeal, vagus, & accessory nerves<br />
– Posterior – sigmoid sinus which leads to internal jugular vein, &<br />
some meningeal branches from occipital & asc<strong>end</strong>ing<br />
pharyngeal arteries<br />
• Petro-occipital fissure<br />
– Ext<strong>end</strong>ing anteriorly from jugular foramen to foramen lacerum<br />
carotid<br />
canal<br />
jugular<br />
foramen<br />
foramen magnum<br />
Occipital bone<br />
occipital<br />
condyle<br />
Occipital bone
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