Anatomy
Conical bulge from bottom surface, just behind and below external acoustic meatus. Contains small interconnected air cells/sinuses, which connect with middle ear; secrete mucus, buffer air pressure changes at eardrum.
Muscles attached; splenius and longissimus capitis, digastric, sternocleidomastoid.
Vignette
Mastoid, ie breast-shaped. Easily felt just behind earhole, medial to pinna. Mastoiditis usually an extension of middle-ear infection; before antibiotics a major cause of morbidity and mortality in children.
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