ct petrous

CT Petrous

Mohamed Wael Samir MD

Prof. of Neurosurgery

Ain Shams University

Superior surface of petrous bone

Trigeminal depression

Arcuate eminence

Medial surface of petrous bone

IAM

Subarcuate fossa & A

Cochlear canaliculus

Vestibular aqueduct

Jugular foramen

Arcuate eminence

(SSC)

Trigeminal impression

Petro occipital suture

Trigeminal impression

Arcuate eminence

(SSC)

IAM

PSC

IAcanal

PSC

LSC

vestibule

Epitympanum

Mastoid antrum

Middle ear cavity with Malleus & incus

Tympanic segment of facial nerve

vestibulePSC

Cochlea

IAcanal

Labrynthine segment of facial nerve

Meatal segment of facial nerve

Vestibular aqueduct

Cochlea

Endolyphatic sac

Middle ear

External canal

Cochlear canaliculus

Cochlea

Jugular foramen

Middle ear

External canal

Pharyngotympanic tube (auditory tube)

Carotid canalCarotid canal

Carotid canal

Pharyngotympanic tube (auditory tube)

Jugular foramen

Neural compartment

Vascular compartment

Fallopian Tube

Pontine segment: Meatal segment: labyrinthine segment: tympanic or horizontal : mastoid or vertical segment: Extratemporal segment

Coronal Cuts

TMJ

Carotid canal (vertical segment)

External auditory canal

Middle earCochlea

Middle ear bony ossicles

SCC

LCC

Vestibule

Labrynthine segment

Meatal segment

Quiz

Carotid canalTMJ

References

Hugh D. Curtin, James D. Rabinov and Peter M. Som (2003): Central Skull Base: Embryology Anatomy, and Pathology in Central skull base in Head and Neck Imaging. Peter M. Som & Hugh D. Curt (edit) Mosby, Inc. St. Louis, Chapter 12 FOURTH EDITION. Volume one 785- 863

Thank You

ct petrous

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