S9 Dissection Summary

S9 Dissection Summary

Part 1

    • Review the boundaries and contents of the infratemporal fossa.
    • If remaining, locate the maxillary v. and pterygoid (venous) plexus.
    • On the external carotid a., find the branching point for the maxillary a., and follow the artery into the infratemporal fossa.
    • Locate the following branches of the first (mandibular) part of the maxillary a.:
        • deep auricular a.
        • anterior tympanic a.
        • middle meningeal a.
        • inferior alveolar a.
    • Examine the relationship of the donor’s maxillary aa. to the lateral pterygoid muscles.
        • If the second part of the donor’s maxillary aa. run deep to the lateral pterygoid muscles, bilaterally remove the lateral pterygoid muscles.
        • If the second part of the maxillary arteries are superficial to the lateral pterygoid muscles, find the branches of the second part on both sides, and then remove the lateral pterygoid m. of the side with the poorest examples of maxillary artery branches.
        • Thus, you are establishing superficial and deep dissections of the infratemporal fossa.
    • Locate the branches of the second (pterygoid) part of the maxillary a., the:
        • masseteric a.
        • posterior deep temporal a. (& pterygoid brs)
        • anterior deep temporal a.
        • buccal a.
        • Depending on the course of the maxillary a. (if the maxillary a. runs deep to the lateral pterygoid m.), you may need to reflect the lateral pterygoid m.
    • For the deep dissection, if the lateral pterygoid m. is still present, remove the muscle in its entirety.
        • Examine the maxillary a. to determine how much of V3 it obscures.
        • Use your best judgment to either remove or reflect the maxillary a. to visualize V3 and its divisions.
    • Locate branches of the anterior & posterior division of the V3.
    • With fine forceps, gently reflect the posterior trunk of V3 to reveal the otic ganglion.