incusn.
/ˈɪŋkəs/, U.S. /ˈɪŋkəs/ Anatomy and Zoology.
1. The middle one of the three small bones of the ear (malleus, incus, and stapes), to which the sonorous vibrations are conveyed from the malleus or ‘hammer’: = anvil n. 3.
ΘΚΠ
the world > life > the body > structural parts > bone or bones > skull > parts of skull > [noun] > bones of ear > incus
stithy1578
anvil1594
stith1633
incus1669
1669 W. Holder Elem. Speech 162 The Malleus lies along fixed to the Tympanum; and on the other end is joyned to the Incus by a double or Ginglymoid joynt.
1787 J. Hunter in Philos. Trans. (Royal Soc.) 77 434 The incus is attached by a small process to the tympanum, and is suspended between the malleus and stapes.
1856 R. B. Todd & W. Bowman Physiol. Anat. II. 70 The incus is shaped not unlike a molar tooth.
2. A part of the ‘trophi’ or mouth-apparatus in Rotifera, upon which the two mallei work.
ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Rotifera > [noun] > member of > mouth apparatus > parts of
ramus1849
fulcrum1855
incus1877
1877 T. H. Huxley Man. Anat. Invertebrated Animals iv. 188 The contraction of the muscular masses, to which the mallei are attached, causes the free ends of the latter to work backwards and forwards upon the incus.
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 633 The mouth [in Rotifera] leads into an œsophagus, followed..usually directly by a muscular pharynx or mastax containing the chitinous jaw-apparatus or ‘trophi’. These consist of two hammer-like bodies, the mallei, which work against an incus or anvil..The incus [consists] of two pieces, rami, borne upon a single piece, the fulcrum.
This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2022).
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n.1669