Mastoid cells Coronal section of right temporal bone. (Mastoid cells labeled at bottom left.) Latin cellulae mastoideae Gray's subject #34 142 Artery stylomastoid artery
A section of the mastoid process of the temporal bone of the cranium shows it to be hollowed out into a number of spaces, the mastoid cells, which exhibit the greatest possible variety as to their size and number.
At the upper and front part of the process they are large and irregular and contain air (a form of skeletal pneumaticity), but toward the lower part they diminish in size, while those at the apex of the process are frequently quite small and contain marrow; occasionally they are entirely absent, and the mastoid is then solid throughout.
Bones of head and neck: the neurocranium of the skull (TA A02.1.01–07, GA 2.129–155) OccipitalOther Parietal Frontal Temporal SphenoidSurfacesOther EthmoidPlatesSurfaces Sensory system: Auditory and Vestibular systems (TA A15.3, TH 3.11.09, GA 10.1029) Outer ear Middle ear
Tegmental wall/roof: Epitympanic recessJugular wall/floorStapedius · Tensor tympani
bony labyrinth)General cochleaPerilymphatic spaceCells
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