The<unk>  is a conical prominence projecting from the undersurface of the<unk>  portion of the temporal bone. It is located just behind the external acoustic meatus, and lateral to the styloid<unk> . Its size and form vary somewhat; it is larger in the male than in the female.
This<unk>  serves for the attachment of the Digastric, Sternocleidomastoid, Splenius capitis, and Longissimus capitis muscles.
The word is derived from the Greek 'masto-', alluding to its resemblance to the breast.
Mastoid process
Ethmoid bone
Gyrus
Lacrimal bone
Outer ear
Occipital bone
Dental alveolus
Frontal bone