Aditus to mastoid antrum

The aditus to mastoid antrum (otomastoid foramen), is a large, irregular opening[1] upon the posterior wall of the tympanic cavity by which the mastoid antrum (situated posteriorly) communicates with the epitympanic recess of the tympanic cavity (situated anteriorly).[2] The walls of the antrum are lined by mucosa which is continuous with that lining the mastoid cells and tympanic cavity.[3]

Aditus to mastoid antrum
The medial wall and part of the posterior and anterior walls of the right tympanic cavity, side view.
Coronal section of right temporal bone
Details
Identifiers
LatinAditus ad antrum mastoideum
TA98A15.3.02.021
TA26910
FMA56797
Anatomical terminology

The medial wall of the aditus features a ridge created by the underlying facial canal, and a bulge created by the underlying ampulla of the lateral semicircular canal. The short limb of incus is lodged in a shallow fossa upon the posterior wall of the tympanic cavity just inferior to the aditus. The pyramidal eminence is situated inferior to the aditus.[2]

See also

References
  1. Gray, Henry (1918). Gray's Anatomy (20th ed.). p. 1042.
  2. Sinnatamby, Chummy S. (2011). Last's Anatomy (12th ed.). Elsevier Australia. p. 416. ISBN 978-0-7295-3752-0.
  3. Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. p. 746. ISBN 978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)


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