Internal Auditory Canal Anatomy

• 7-up: facial n
• coke down: cochlear n
• SVN: sup vestibular n (superior & lateral semicircular canal; utricle)
• IVN: inf vestibular n (posterior semicircular canal; saccule)
• BB: Bill's bar (bony protrusion, separates ant/post)

Source: http://roentgenrayreader.blogspot.com/

Semicircular canal anatomy:

Source: http://www.answers.com/topic/semicircular-canal