Middle Ear Cavity aka Tympanic Cavity


FIG. 910– The tympanic membrane viewed from within. (Testut.) The malleus has been resected immediately beyond its lateral process, in order to show the tympanomalleolar folds and the membrana flaccida.

1. Tympanic membrane.
2. Umbo.
3. Handle of the malleus.
4. Lateral process.
5. Anterior tympanomalleolar fold.
6. Posterior tympanomalleolar fold.
7. Pars flaccida. 8. Anterior pouch of Tröltsch.
9. Posterior pouch of Tröltsch.
10. Fibrocartilaginous ring.
11. Petrotympanic fissure.
12. Auditory tube.
13. Iter chordæ posterius.
14. Iter chordæ anterius.
15. Fossa incudis for short crus of the incus.
16. Prominentia styloidea.

p/s: emmm, saya pun tak pasti apa yang saya jumpa, tapi saya nak save link animations nie.. :D

yg kat bawah nie amik kat sini.. credit to kak zahidah :) syukran!

The Ear

Dissection of the ear is difficult in the lab and usually takes too much time in most anatomy courses, but, you should have some understanding of what makes up the ear.
The ear is usually broken up into three parts:
  • External ear
    • auricle
    • external auditory meatus

  • Middle ear (or tympanum, tympanic cavity)
    • tympanic membrane
    • tympanic cavity & antrum
    • pharyngotympanic tube (or auditory tube, or Eustachian tube)

  • Internal (inner) ear
    • osseous labyrinth
    • membranous labrynth

External Ear
  1. concha
  2. crus helix
  3. helix
  4. scaphoid fossa
  5. antihelix
  6. antitragus
  7. tragus
lobule not labeled

Middle earThe diagram shows a cut through the external, middle and inner ears.
The middle ear cavity is like a small box with lateral, medial, anterior and posterior walls, a floor and a roof. This box is located inside the temporal bone. Items to identify are:
  • mec-middle ear cavity
  • ptb-temporal bone,
  • eam-external auditory meatus,
  • ec-ear cartilage,
  • tm-tympanic membrane.
    Medial wall
  • promontory with its tympanic plexus of nerves
    Lateral wall
  • tympanic membrane (tm)
    Anterior wall
  • pharyngotympanic tube (at)
  • sulcus for internal carotid artery
    Posterior wall
  • opening into mastoid air cells
  • tegmen tympani of petrous temporal bone ptb
  • sulcus for internal jugular vein (not shown)
Contents of the middle ear cavity:
  • malleus (m)
  • incus (i)
  • stapes (s)

Internal EarThe internal or inner ear is made up of an osseous part (ol) which encloses a membranous part (ml), in blue on the image. The membranous part includes the vestibule and semicircular canals for equilibrium and the cochlea for sound.

If visualizing the middle ear cavity in three dimensions is difficult, print out the following image and make the proper folds. The associated structures are listed and numbered.
Middle ear cavity
  1. canal for tensor tympani muscle
  2. auditory tube
  3. internal carotid artery
  4. facial nerve
  5. geniculate ganglion
  6. greater petrosal nerve
  7. lesser petrosal nerve
  8. promontory formed by 1st turn of cochlea
  9. tympanic plexus
  10. round window
  11. lateral semicircular canal
  12. facial canal and facial nerve
  13. oval window for stapes
  14. tympanic nerve from IX
  15. jugular vein
  16. opening to mastoid air cells (aditus ad antrum)
  17. tendon of stapedius muscle
  18. malleus
  19. tympanic membrane
  20. chorda tympani
  21. stylomastoid foramen

List of items to identify in this lesson

Bones of orbitfrontal
greater wing of sphenoid
ethmoid (orbital plate)
lesser wing of sphenoid
Foramina of orbit
optic foramen
anterior ethmoidal foramen
posterior ethmoidal foramen
superior orbital fissure
inferior orbital fissure
zygomatic foramen
Contents of orbit
optic nerve
ophthalmic artery
central artery of retina
superior ophthalmic vein
ophthalmic division of V
anterior ethmoidal
posterior ethmoidal (very small)
trochlear nerve
abducens nerve
upper division
lower division
ciliary ganglion

Floor of orbitinfraorbital nerve
zygomatic nerve
levator palpebrae superioris
superior rectus
superior oblique
medial rectus
lateral rectus
inferior rectus
inferior oblique
External Ear
crus helix
scaphoid fossa
lobule not labeled
Middle ear

1st time wat nota copy n paste :P
ntah, tensen sangat kot tegok 'ruang' yg sempit

*jadi menyampah bila apa yang kita cari tak jumpa.. pheww*
fasobrun jameel :)