Neurosurgery notes/Anatomy/Skull base anatomy/Posterior fossa/Cerebellopontine angle/Petrous bone anatomy

Petrous bone anatomy

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Cerebellopontine angle

Anatomy of the mastoid

27: Ant. semicircular canal;
28: Lateral semicircular canal;
29: Post. semicircular canal;
30: Canal for facial nerve;
32: Tympanic part of temporal bone;
33: Post. glenoid tubercle;
34: Mastoid air cells;
35: Mastoid foramen (mastoid emissary vein);
36: Dura;
37: Malleus (head);
38: Chorda tympani;
39: Tympanic membrane;
40: Facial nerve;
41, 42: Styloid process;
43: Occipital condyle;
44: Sigmoid vein
Right ear
Right ear

Sagittal cut through the middle ear

(F) Right middle ear - lateral surface
34: Mastoid air cells;
37: Incudomalleolar joint;
39: Tympanic membrane;
42: Styloid process;
43: Occipital condyle;
45: Tegmen tympani;
46: Malleus (head);
47: Incus (body);
49: Aditus to mastoid antrum;
50: Mastoid antrum;
51: Stylomastoid foramen;
52: Semicanal for auditory tube;
53: Semicanal for tensor tympani
A sagittal cut through the middle ear.
A sagittal cut through the middle ear.
(G) Right middle ear - medial
28: Lateral semicircular canal;
30: Canal for facial nerve (Fallopian canal);
34: Mastoid air cells;
54: (Ant. semicircular canal) arcuate eminence;
55: Oval window;
56: Promontory;
57: Cochleariform process;
58: Opening of auditory tube;
59: Carotid;
60: Jugular bulb;
61: Round window
A sagittal cut through the middle ear.
A sagittal cut through the middle ear.

Axial cut through the left middle ear

(A) caudal part
1: Transverse sinus;
2: Mastoid air cells;
3: External Auditory Meatus;
4: TMJ;
5: Superficial temporal artery;
6: Mandible;
7: Pterygoid;
8: Maxillary artery;
9: Maxillary sinus;
10: Sphenopalatine artery;
11: Sphenoid sinus;
12: Cavernous sinus;
14: Internal carotid in foramen lacerum;
16: Cavity of middle ear;
17: Tympanic membrane;
19: Internal auditory meatus;
20: Promontory;
21: Facial nerve
An axial cut through the Left petrous bone
An axial cut through the Left petrous bone
(B) cranial part
3: External Auditory Meatus;
13: Tensor tympani in semicircular canal;
15: Eustachian tube;
18: Cochlear;
21: CN VII;
23: Semicircular canal;
24: Vestibular nerve;
25: Cochlear nerve;
26: Labyrinthine artery;
27: Internal carotid artery in foramen lacerum;
28: Stapes;
29: Tympanic membrane
An axial cut through the Left petrous bone
An axial cut through the Left petrous bone

Axial cut through the right middle ear

3: External Auditory Meatus;
13: Tensor tympani in semicircular canal;
15: Eustachian tube;
16: Middle ear cavity, Attico (Black space surrounded);
17: Tympanic membrane;
18: Cochlear;
21: CN VII;
23: Vestibule part of osseous labyrinth;
24: Vestibular nerve;
25: Cochlear nerve;
26: CN VIII; 28: Stapes;
29: Incus;
30: Long limb of incus;
31: Pyramid;
32: Stapedius;
33: Stapes;
34: Osseous spiral lamina;
35: Basilar membrane;
36: Scala tympani;
37: Scala vestibule;
38: Modiolus;
39: Malleolus (head)
notion image
 
13: Tensor tympani in semicircular canal;
15: Eustachian tube;
16: Middle ear space;
17: Tympanic membrane;
18: Vestibule;
20: Promontory;
22: Post semi circular canal;
30: Long limb of incus;
31: Pyramid;
32: Stapedius muscle;
33: Stapes;
40: Stapedo-malleolar joint
 
notion image
Axial cut through the right middle ear