duodenal antrum - definizione. Che cos'è duodenal antrum
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Cosa (chi) è duodenal antrum - definizione

AIR SPACE IN THE PETROUS PORTION OF THE TEMPORAL BONE
Tympanic antrum; Antrum mastoideum; Valsalva's antrum

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.
Aditus to mastoid antrum         
Aditus ad antrum; Entrance to the antrum; Entrance to the mastoid antrum; Entrance to the tympanic antrum; Aditus ad antrum mastoideum
The aditus to mastoid antrum (otomastoid foramen or entrance or aperture to the mastoid antrum) is a large irregular cavity that leads backward from the epitympanic recess into a considerable air space named the tympanic or mastoid antrum.
Follicular antrum         
PORTION OF AN OVARIAN FOLLICLE FILLED WITH FOLLICULAR FLUID
Antrum follicularum; Follicle antrum; Antrum folliculare; Follicular antrums
The follicular antrum is the portion of an ovarian follicle filled with follicular fluid. Appearance of the follicular antrum during follicular maturation is the first sign that a follicle has reached the next stage of maturation.

Wikipedia

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.