Sulcus spiralis externus

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Sulcus spiralis externus

Floor of ductus cochlearis.
Gray's	subject #232 1055

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

This article incorporates text from a public domain edition of Gray's Anatomy.

Sensory system: Auditory and Vestibular systems (TA A15.3, TH 3.11.09, GA 10.1029)

Outer ear

Pinna (Helix, Antihelix, Tragus, Antitragus, Incisura anterior auris, Earlobe)
Ear canal
Auricular muscles

Eardrum (Umbo
Pars flaccida)

Middle ear

Tympanic cavity	Labyrinthine wall/medial: Oval window Round window Secondary tympanic membrane Prominence of facial canal Promontory of tympanic cavity Membranous wall/lateral Mastoid wall/posterior: Mastoid cells Aditus to mastoid antrum Pyramidal eminence Carotid wall/anterior Tegmental wall/roof: Epitympanic recess Jugular wall/floor

Ossicles	Malleus (Neck of malleus, Superior ligament of malleus, Lateral ligament of malleus, Anterior ligament of malleus) Incus (Superior ligament of incus, Posterior ligament of incus) Stapes (Anular ligament of stapes)

Muscles	Stapedius Tensor tympani

Eustachian tube	Bony part of pharyngotympanic tube Cartilage of pharyngotympanic tube (Torus tubarius)

Inner ear/
(membranous labyrinth,
bony labyrinth)

Auditory system
Cochlear labyrinth

General cochlea	Scala vestibuli Helicotrema Scala tympani Modiolus Cochlear cupula

Perilymphatic space	Perilymph Cochlear aqueduct

Cochlear duct / scala media	Reissner's/vestibular membrane Basilar membrane Reticular membrane Endolymph Stria vascularis Spiral ligament Organ of Corti: Stereocilia Tectorial membrane Sulcus spiralis (externus, internus) Spiral limbus

Cells	Claudius cell Boettcher cell

Vestibular system/
Vestibular labyrinth

Static/translations/vestibule/endolymphatic duct: Utricle (Macula)
Saccule (Macula, Endolymphatic sac)
Kinocilium
Otolith
Vestibular aqueduct
Canalis reuniens

Kinetic/rotations: Semicircular canals (Superior, Posterior, Horizontal)
Ampullary cupula
Ampullae (Crista ampullaris)

M: EAR

anat (e/p)/phys/devp

noco/cong, epon

proc, drug (S2)

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