S5 Dissection Summary

S5 Dissection Summary

Part 1 - Parotid Duct

  • Skin and locate the entirety of the parotid gland
  • Locate the proximal portion of the parotid (Stensen’s) duct as it exits the parotid gland
        • Small branches of the facial n. (CN VII) will likely also be visible in this area
        • Do NOT dissect or follow the duct or facial n. branches at this time
  • At approximately the level of the 2nd maxillary molars, locate the papilla of parotid gland of the oral mucosa

Part 2 - Auricular Neurovasculature

Part 3 - Facial Nerve

  • Unilaterally, remove portions of the parotid gland
  • Trace facial n. branches to the temporofacial and cervicofacial divisions, and follow these divisions until they condense as a main trunk
  • Continue to trace the main trunk of the facial n. until you reach its emergence from the skull at the stylomastoid foramen
  • Locate the retromandibular v., and follow it to the potential junctions with:

Part 4 - Submandibular Triangle

  • Clean the anterior and posterior bellies of the digastric m.
  • Within the submandibular triangle, locate the superficial part of the submandibular gland.
  • Locate the facial a.
  • dentify any submandibular and submental lymph nodes in this area
  • Clean the stylohyoid m., and observe the muscle’s attachment sites.
  • Cut the intermediate tendon of the digastric m.
      • Reflect the posterior belly of the digastric m. superolaterally
      • Relieve the stylohyoid m. from the hyoid bone, and reflect it superiorly
      • The retromandibular v. may also be reflected superiorly
  • Locate the terminal branches of external carotid a.:
      • maxillary a.
      • superficial temporal a.
  • Locate as many of the branches of the external carotid a. as possible.
  • Locate the hypoglossal n. (CN XII) in association with the facial a. as it passes deep to the mylohyoid m.
  • Deep to the hypoglossal n. (CN XII) and the mylohyoid m., identify the hyoglossus m.