Superior semicircular canal
Encyclopedia
The superior semicircular canal (anterior semicircular canal) is a part of the vestibular system
and detects rotation of the head around a rostral-caudal (anterior-posterior) axis.
, on the anterior surface of which its arch forms a round projection. As part of the vestibular system
it detects rotation of the head around a rostral-caudal (anterior-posterior) axis.
It describes about two-thirds of a circle.
Its lateral extremity is ampullated, and opens into the upper part of the vestibule
; the opposite end joins with the upper part of the posterior canal to form the crus commune, which opens into the upper and medial part of the vestibule.
Vestibular system
The vestibular system, which contributes to balance in most mammals and to the sense of spatial orientation, is the sensory system that provides the leading contribution about movement and sense of balance. Together with the cochlea, a part of the auditory system, it constitutes the labyrinth of...
and detects rotation of the head around a rostral-caudal (anterior-posterior) axis.
Structure
It is 15 to 20 mm in length, is vertical in direction, and is placed transversely to the long axis of the petrous portion of the temporal boneTemporal bone
The temporal bones are situated at the sides and base of the skull, and lateral to the temporal lobes of the cerebrum.The temporal bone supports that part of the face known as the temple.-Parts:The temporal bone consists of four parts:* Squama temporalis...
, on the anterior surface of which its arch forms a round projection. As part of the vestibular system
Vestibular system
The vestibular system, which contributes to balance in most mammals and to the sense of spatial orientation, is the sensory system that provides the leading contribution about movement and sense of balance. Together with the cochlea, a part of the auditory system, it constitutes the labyrinth of...
it detects rotation of the head around a rostral-caudal (anterior-posterior) axis.
It describes about two-thirds of a circle.
Its lateral extremity is ampullated, and opens into the upper part of the vestibule
Vestibule of the ear
-Definition:The vestibule is the central part of the osseous labyrinth, and is situated medial to the tympanic cavity, behind the cochlea, and in front of the semicircular canals.The etymology comes from the Latin vestibulum, literally an entrance hall....
; the opposite end joins with the upper part of the posterior canal to form the crus commune, which opens into the upper and medial part of the vestibule.