Assertion: mastoid process's portion | /r/HasProperty | thin
Facets:
Source sentences:
text: The central portion of the tympanic part is thin, and in a considerable percentage of skulls is perforated by a hole, the foramen of Huschke.
text: The central portion of the tympanic part is thin, as it gives rise to the bony inner two-thirds of the ear canal, and in 5 - 20% of skulls the lower surface is perforated by a hole, the foramen of Huschke that opens onto the temporomandibular joint due to incomplete fusion of the anterior and posterior prominences during development.