Sulcus spiralis externus

Anatomical feature

Sulcus spiralis externus
Floor of ductus cochlearis.
Details
Identifiers
Latin	Sulcus spiralis externus
TA98	A15.3.03.124
FMA	77851
Anatomical terminology [edit on Wikidata]

The basilar crest gives attachment to the outer edge of the basilar membrane; immediately above the crest is a concavity, the sulcus spiralis externus.

References

This article incorporates text in the public domain from page 1055 of the 20th edition of Gray's Anatomy (1918)

Anatomy of hearing and balance

Outer ear

Auricle
- helix
- antihelix
- tragus
- antitragus
- intertragic notch
- earlobe
Ear canal
Auricular muscles
Eardrum
- umbo
- pars flaccida

Middle ear

Tympanic cavity	Medial structures oval window round window secondary tympanic membrane prominence of facial canal promontory of tympanic cavity Posterior structures mastoid cells aditus to mastoid antrum pyramidal eminence
Ossicles	Malleus superior ligament lateral ligament anterior ligament Incus superior ligament posterior ligament Stapes annular ligament Muscles stapedius tensor tympani
Auditory tube / Eustachian tube	Torus tubarius

Inner ear

Labyrinths

Auditory system

General	Cochlea Vestibular duct Helicotrema Tympanic duct Modiolus Cochlear cupula Perilymphatic space Perilymph Cochlear aqueduct Cells Claudius Boettcher
Cochlear duct / scala media	Reissner's/vestibular membrane Basilar membrane Reticular membrane Endolymph Stria vascularis Spiral ligament Organ of Corti stereocilia tip links Tectorial membrane Sulcus spiralis externus internus Spiral limbus

Vestibular system

Vestibule	Utricle macula Saccule macula Kinocilium Otolith Otolithic membrane Vestibular aqueduct endolymphatic duct endolymphatic sac Ductus reuniens
Semicircular canals	Superior Posterior Horizontal Ampullary cupula Ampullae crista ampullaris