| spina tympanica major | The anterior edge of the tympanic notch (of Rivinus). Synonym: spina tympanica major. (05 Mar 2000) |
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| spina tympanica minor | The posterior edge of the tympanic notch (of Rivinus). Synonym: spina tympanica minor. (05 Mar 2000) |
| spina ventosa | A condition occasionally seen in tuberculosis or tuberculous dactylitis, in which there is absorption of bone bordering the medulla, with a new deposit under the periosteum, resulting in a change that is suggestive of bone being inflated with gas. (05 Mar 2000) |