- Source: Mastoid antrum
The mastoid antrum (tympanic antrum, antrum mastoideum, Valsalva's antrum) is an air space in the petrous portion of the temporal bone, communicating posteriorly with the mastoid cells and anteriorly with the epitympanic recess of the middle ear via the aditus to mastoid antrum (entrance to the mastoid antrum). These air spaces function as sound receptors, provide voice resonance, act as acoustic insulation and dissipation, provide protection from physical damage and reduce the mass of the cranium.
The roof is formed by the tegmen antri which is a continuation of the tegmen tympani and separates it from the middle cranial fossa.
The lateral wall of the antrum is formed by a plate of bone which is an average of 1.5 cm in adults.
The mastoid air cell system is a major contributor to middle ear inflammatory diseases.
Additional images
References
External links
Anatomy figure: 30:02-01 at Human Anatomy Online, SUNY Downstate Medical Center - "Illustration of the continuity of the nasopharynx with the middle ear cavity via the auditory tube."
Kata Kunci Pencarian:
- Foramen spinosum
- Mastoid antrum
- Antrum
- Mastoid cells
- Aditus to mastoid antrum
- Suprameatal triangle
- Mastoid part of the temporal bone
- Mastoiditis
- Epitympanic recess
- Koerner's septum
- Outline of human anatomy
