Canals of the temporal bone

Canals of the temporal bone: Anatomy & ContentsKey facts about the anatomy and contents of the canals of the temporal bone
~ 3 min

In this pdf-note, we will learn the structure of the openings and canals of the temporal bone.

Openings and canals of the temporal bone
Title External opening Internal opening Contents
Carotid canal
(canalis caroticus)
External opening of the carotid canal on the inferior surface of the petrous part Internal opening of the carotid canal on the apex of the petrous part Internal carotid artery and internal carotid plexus
Musculotubal canal
(canalis musculotubarius)
At the apex of the petrous part near the petrosquamous fissure Canal for the auditory tube
(semicanalis tubae auditivae)
On the anterior wall of the tympanic cavity
Canal for the tensor tympani muscle
(semicanalis musculi tensoris tympani)
Auditory tube
Tensor tympani muscle
Facial canal
(canalis facialis)
Bottom of the internal acoustic meatus

The canal forms two genicula (bendings)
Stylomastoid foramen (foramen stylomastoideum) Facial nerve, stylomastoid artery, stylomastoid vein
Canaliculus for the chorda tympani
(canaliculus chordae tympani)
Inside the facial canal, above the stylomastoid foramen Petrotympanic fissure (fissura petrotympanica) Chorda tympani (chorda tympani) – a branch of the facial nerve
Tympanic canaliculus
(canaliculus tympanicus)
In the petrosal fossula (fossula petrosa) Hiatus for lesser petrosal nerve (hiatus canalis nervi petrosi minoris) on the anterior surface of the petrous part Tympanic nerve (n. tympanicus) – a branch of the glossopharyngeal nerve
Mastoid canaliculus
(canaliculus mastoideus)
Jugular fossa (fossa jugularis) Tympanomastoid fissure (fissura tympanomastoidea) Auricular branch of vagus nerve
Caroticotympanic canaliculi
(canaliculi caroticotympanici) – 2-3 units
Inside the wall of the carotid canal In the tympanic cavity Caroticotympanic arteries, caroticotympanic nerves
Canal of the greater petrosal nerve
(canalis nervi petrosi majoris)
Facial canal in the area of the geniculum Hiatus for the greater petrosal nerve (hiatus canalis nervi petrosi majoris) Greater petrosal nerve (n. petrosus major)
Carotid canal (canalis caroticus)
Carotid canal (canalis caroticus)
Musculotubal canal (canalis musculotubarius)
Musculotubal canal (canalis musculotubarius)
Canal for the tensor tympani muscle (semicanalis musculi tensoris tympani)
Canal for the tensor tympani muscle (semicanalis musculi tensoris tympani)
Canal for the auditory tube (semicanalis tubae auditivae)
Canal for the auditory tube (semicanalis tubae auditivae)
Facial canal (canalis facialis)
Facial canal (canalis facialis)

Dictionary

Canals of the temporal bone

carotid canal
canalis caroticus
external opening of carotid canal
apertura externa canalis carotici
internal opening of carotid canal
apertura interna canalis carotici
musculotubal canal
canalis musculotubarius
petrosquamous fissure
fissura petrosquamosa
canal for auditory tube
semicanalis tubae auditivae
canal for tensor tympani
semicanalis musculi tensoris tympani
facial canal
canalis facialis
stylomastoid foramen
foramen stylomastoideum
canaliculus for chorda tympani
canaliculus chordae tympani
petrotympanic fissure
fissura petrotympanica
tympanic canaliculus
canaliculus tympanicus
petrosal fossula
fossula petrosa
hiatus for lesser petrosal nerve
hiatus canalis nervi petrosi minoris
tympanic nerve
n. tympanicus
mastoid canaliculus
canaliculus mastoideus
jugular fossa
fossa jugularis
tympanomastoid fissure
fissura tympanomastoidea
caroticotympanic canaliculi
canaliculi caroticotympanici
hiatus for greater petrosal nerve
hiatus canalis nervi petrosi majoris
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