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7 Cards in this Set

  • Front
  • Back
6 Borders of Middle Ear
Lateral: Tympanic Membrane
Medial: Oval window and Round window
Anterior:(Carotid) seperates interanl carotid and allows opening of auditory tube
Posterior: (Mastoid) seperates Mastoid air cells
Floor: (Jugular) seperates Internal jugular artery
Roof: Tegmen Tympani seperates from middle cranial fossa
Contents of Middle Ear
1- Auditory Ossicles
(Malleus, Incus, Stapes)
2- Chorda tympani nerve and tympanic nerve plexus
3-tendons of tensor tympania and stapedius muscle
Inner ear:
Where located?
Petrous portion of temporal bone
semicircular ducts & Canals
Sensory Innervation
Greater Auricular C2-3
Lesser Occipital C2
Auricular Branch of Vagus
What is the Sensory Innervation to both:

External Acoustic meatus

External surface of tympanic membrane
Auriculotemporal (V3 Mandibular)
and some CN 7 and X
Sensory innervation to
Middle ear Cavity
Auditory tube
Internal Surface of tympanic membrane
Tympanic Branch of Glossopharyngeal via tympanic plexus
Sensory Innervation to
Inner Ear
Special Sensory:
Vestibulocochlear (CN 8)
Cochlear part to organ of Corti

Vestibular part to maculae and cristae