Musculotubal canal
The musculotubal canal is divided into the upper canal for tensor tympani and the lower canal for the auditory tube by a shelf of bony plates called the septum of musculotubal canal.
Canal for tensor tympani
The tensor tympani muscle passed through. This muscle attaches into the base of handle of malleus.
Canal for auditory tube
The pharyngotympanic (auditory) tube about 4 cm long passes through it. This tube connects the middle ear to the nasal cavity (nasopharyx) and supplies air to the tympanic cavity.
Part (2/3) of the auditory tube is cartilaginous and part (1/3) is bony. The bony entrance of the auditory tube lies between the carotid canal and the foramen spinosum.