Helicotrema

Helicotrema

The cochlea and vestibule, viewed from above.
Gray's	subject #232 1050
Dorlands/Elsevier	h_04/12410950

The helicotrema is the part of the cochlear labyrinth where the scala tympani and the scala vestibuli meet. It is also known as the cochlear apex. This area best detects low frequency sounds.

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v • d • e Sensory system: Auditory and Vestibular systems

Outer ear	Pinna (Helix, Antihelix, Tragus, Antitragus, Earlobe) • Ear canal

Middle ear	Eardrum (Umbo) • Ossicles (Malleus, Incus & Stapes) • muscles (Stapedius, Tensor tympani) • Eustachian tube (Torus tubarius)

Inner ear/Labyrinth	Bony labyrinth (Vestibule) • Membranous labyrinth Oval window → Scala vestibuli / Reissner's/vestibular membrane, Helicotrema and Scala tympani / Basilar membrane (Perilymph) → Round window Cochlea: Modiolus • Cochlear duct / scala media (Endolymph, Stria vascularis, Spiral ligament, Organ of Corti), Olivocochlear system Organ of Corti: Stereocilia • Sulcus spiralis (externus, internus) • Limbus spiralis

to brain (auditory)	Tectorial membrane → Hair cells → Spiral ganglion → Cochlear nerve ^VIII → Cochlear nuclei → Trapezoid body → Superior olivary nuclei → Lateral lemniscus → Inferior colliculi → Medial geniculate nuclei → Auditory radiations → Primary auditory cortex

Vestibular system	Static/translations: Utricle (Macula) – Saccule (Macula, Endolymphatic sac, Endolymphatic duct) – Kinocilium – Otolith Kinetic/rotations: Semicircular canals (Superior, Posterior, Horizontal) • Cupula • Ampullae (Crista ampullaris)

to brain (vestibular)	Vestibular nerve ^VIII → Vestibular nuclei, Flocculonodular lobe Vestibular nuclei → Vestibulospinal tract, Ventral posterolateral nucleus → Vestibular cortex