| mastoid foramen | An opening at the posterior portion of the mastoid process, transmitting the mastoid branch of the occipital artery to the dura and an emissary vein to the sigmoid sinus. Synonym: foramen mastoideum. (05 Mar 2000) |
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| mastoid fossa | A small depression on the mastoid part of the temporal bone, posterior to the suprameatal spine. Synonym: foveola suprameatica, mastoid fossa, fossa mastoidea, supramastoid fossa. (05 Mar 2000) |
| mastoid groove | The groove medial to the mastoid process of the temporal bone from which the digastric muscle originates. Synonym: incisura mastoidea, digastric groove, digastric notch, mastoid notch. (05 Mar 2000) |
| mastoid lymph nodes | Two or three nodes in the region of the mastoid process; they receive afferent lymphatic vessels from the scalp and auricle and send efferent vessels to the superior deep cervical nodes. Synonym: nodi lymphatici mastoidei, mastoid lymph nodes. (05 Mar 2000) |
| mastoid margin of occipital bone | The margin of the occipital squama that articulates with the temporal bone. Synonym: margo mastoideus squamae occipitalis, mastoid margin of occipital bone. (05 Mar 2000) |
| mastoid notch | The groove medial to the mastoid process of the temporal bone from which the digastric muscle originates. Synonym: incisura mastoidea, digastric groove, digastric notch, mastoid notch. (05 Mar 2000) |
| mastoid part of the temporal bone | The portion of the petrous part of the temporal bone bearing the mastoid process. Synonym: pars mastoidea ossis temporalis. (05 Mar 2000) |
| mastoid process | The nipple-like projection of the petrous part of the temporal bone. Synonym: processus mastoideus, mastoid bone, temporal apophysis. (05 Mar 2000) |
| mastoid sinuses | Numerous small intercommunicating cavities in the mastoid process of the temporal bone that empty into the mastoid or tympanic antrum. Synonym: cellulae mastoideae, mastoid cells, mastoid sinuses. (05 Mar 2000) |
| mastoid wall of middle ear | It contains the opening into the mastoid antrum. Synonym: paries mastoideus cavi tympani, mastoid wall of middle ear, posterior wall of middle ear. (05 Mar 2000) |
| mastoidal | A bony process off the base of the skull that is composed of air cells. Inflammation of the mastoid is known as mastoiditis. (27 Sep 1997) |
| mastoidale | The lowest point on the contour of the mastoid process. (05 Mar 2000) |
| mastoidectomy | Hollowing out of the mastoid process by curretting, gouging, drilling, or otherwise removing the bony partitions forming the mastoid cells. Origin: mastoid (process) + G. Ektome, excision (05 Mar 2000) |
| mastoiditis | <pathology> Inflammation of the mastoid antrum and cells. (18 Nov 1997) |