Posterior ligament of incus

Posterior ligament of incus
Details
From	incus
To	incus
Identifiers
Latin	ligamentum incudis posterius
TA98	A15.3.02.058
TA2	1643
FMA	60883
Anatomical terminology [edit on Wikidata]

The posterior ligament of the incus is a fibrous band that connects the tip of the short crus of the incus to the fossa incudis,^[1]^[2] running to the mastoid (posterior wall of the middle ear chamber). The posterior incudal ligament plays an important role in the vibration of the middle ear bones: together with the anterior ligament of the malleus, it forms a pivotal axis around which the ossicles rotate. This rotation conveys vibrations from the tympanum to the oval window on the bony labyrinth (where they can be transduced into electrical signals transmitted to the nervous system).

References

^ Standring, Susan, ed. (2021). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42nd ed.). Elsevier. p. 748. ISBN 978-0-7020-7705-0.
^ McMillan, Ryan A.; Nassiri, Ashley M.; Leonel, Luciano C.; Rezende, Natalia C.; Peris Celda, Maria; Sweeney, Alex D.; Carlson, Matthew L. "The posterior ligament of the incus ("white dot"): A reliable surgical landmark for the facial recess". American Journal of Otolaryngology. 43 (2). doi:10.1016/j.amjoto.2021.103304.

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