- Umbo is also a term for a shield boss and for the swollen (oldest) part of a bivalve (clam, mussel, etc) shell near the ligament that holds together the two shell valves.
| Umbo of tympanic membrane | |
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| Right tympanic membrane as seen through a speculum. | |
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| The tympanic membrane viewed from within. The Umbo is located near the center, denoted as 2. | |
| Latin | umbo membranae tympanicae |
| Gray's | subject #230 1039 |
The umbo is the most depressed part of the tympanic membrane.
Depression
The manubrium of the malleus is firmly attached to the medial surface of the membrane as far as its center, which it draws toward the tympanic cavity; the lateral surface of the membrane is thus concave, and the most depressed part of this concavity is named the umbo.
External links
- Diagram at unmc.edu
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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
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