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| Name | 1.8 Step 8. Internal acoustic meatus; labyrinthine artery; facial and vestibulocochlear nerves |
| Video Uploader | Video From Netter's Anatomy Dissections |
| Upload Date | This Video Uploaded At 17-11-2017 19:30:17 |
| Video Discription | These videos have been excerpted from Netter’s Video Dissection Modules on Student Consult. http://bit.ly/2oEt9CO This is the middle cranial fossa on the right side. Remove the dura from the anterior slope of the petrous ridge to expose the greater and lesser petrosal nerves. The nerves are useful landmarks because the area between them is where the anterior part of the tympanic cavity is located. On the posterior slope, re-identify the internal acoustic meatus and the structures entering it - the labyrinthine artery and the facial and vestibulocochlear nerves. Note that the facial nerve has a separate portion called the intermediate nerve. Chisel away the bony roof of the internal acoustic meatus and follow the facial nerve to the geniculate ganglion. Note where the facial nerve turns posteriorly and horizontally in the medial wall of the middle ear cavity. Note that the greater petrosal nerve, which here has been severed, originates from the region of the geniculate ganglion. Identify the arcuate eminence, which will be shaved away in the next step to show the semicircular canals. |
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