anatomy of the internal and external ear

1. Anatomy of
Ear Dr.mehr

2. .

3. cle
Lobule
External auditory meatus
Ear drum
.

4. Auricle
Lobule of ear
auditory
meatus
Ear drum
.

5. Tympanic memebrane
(Ear drum)
.

6. Tympanic
membrane
External
auditory meatus
Malleus
Middle ear.

7. Pars flaccida
Handle of
malleus
Pars tensa
.
Cone of light

8. Tympanic
membrane
Malleus
Middle ear
Umbo
Handle of
malleus
.

9. Blood & Nerve Supply of Tympanic
Membrane
• 1- Nerve Supply:
• A- Outer surface: is supplied by auriculo-
temporal and auricular branch of vagus.
• B- Inner surface: tympanic plexus.
• 2- Blood Supply:
• 1- Outer surface: deep auricular artery.
• 2- Inner surface: from anterior tympanic
artery.
.

10. Outer aspect
of tymoanic
membrane
Handle of
malleus
Cone of light .

11. Otitis
media
.

12. B- Middle Ear
.

13. Epitympani
c recess
Tympanic cavity
Parts of middle ear cavity
.

14. Roof
Floor
Posterior
wall
Medial wall
Walls of middle ear
Anterior
wall
.

15. Tegmen
tympani
.

16. Roof
Tegman tympani
Floor
Tympanic br. Of
Glosso-
pharyngeal n.
Int. jugular vein
Roof & Floor
.

17. Anterior
wall
Promontory
Tympanic
plexus
Oval
window
Posterior
wall
Round
window
Br. From sympathetic
plexus around I.C.A.
Tympanic br. Of 9th CN
Canal for facial N. Medial wall
.

18. Roof
Floor
Posterior
wall
Tensor tympani m.
Auditory
tube
Sympathetic
plexus
Anterior wall
Anterior
wall
.
Internal
carotid art.

19. Aditus ad
antrum
Pyramid
Facial canal
Chorda
tympani
Posterior wall
.

20. Ear drum
Lateral wall
External auditory meatus
.

21. Contents of middle ear
1 Ossicles: Malleus, incus and stapes.
2 Muscles: Tensor tympani & Stapedius.
3Nerves: Tympanic plexus and chorda
tympani.
4 Blood vessels: Tympanic arteries.
.

22. Malleus Incus
Stapes
Ossicles
.
Middle ear

23. Incus
Stapes
Ossicles Head
Handle
Body
Long process
Head
Neck
Short process
Anterior process
Foot plate
Malleus.
Limbs

24. Pharyngo-tympanic tube
.

25. Middle ear
Lateral wall
of naso-
pharynx
Pharyngo-
tympanic tube
.

26. .

27. .
Opening of
pharyngeotympanic
tube

28. Inner Ear

29. Internal acoustic
meatus
.

30. Petrous Semicircular
canals
Vestibule
Cochlea
Bony labyrinith
.

31. saccule
Utricle
Cochlear duct
Semicircular ducts Membranous
labrynith
.
Endolymphatic duct

32. Vestibulo-cochlear
Nerve

33. Cochlear
nerve
Vestibular
nerve
Internal
auditory
meatus
Vestibulo- cochlear nerve
.

34. Vestibular
ganglia
Spiral ganglia
Cochlear nerve
Vestibulo-
cochlear
nerve
Internal
auditory
meatus
Ponto-
cerebellar
angle
.
Vestibular nerve

35. Transmission of sound
Oval
Incus window
Malleus Stapes
.
Tympanic membrane
Round window closed with 2dry tympanic
membrane

36. Spiral
gangliom
.

37. Applied Anatomy
1 Otitis media.
2 Intracranial injury of facial n.
-At internal auditory meatus.
-At medial wall of middle ear.
3 High tone deafness.
.