sigmoid

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Related to sigmoid notch: submandibular fossa, malar process

sigmoid

[′sig‚mȯid]
(biology)
S-shaped.
References in periodicals archive ?
There is destruction of the articular surfaces of the ulnar head and sigmoid notch as well as loss of soft tissue stability.
13) As performed today, a subperiosteal resection of the entire distal ulna is performed from just proximal to the sigmoid notch.
Additionally, it prevents painful erosion of the sigmoid notch that can be seen following ulnar head arthroplasty.
Through viscoelastic forces, the deep head of the pronator actively compresses the ulnar head into the sigmoid notch in pronation and acts to do the same, but in lesser magnitude, during supination.
Dorsal dislocations of the ulna present with a dorso-ulnar prominence with a block to supination; in volar dislocations, a volar-ulnar prominence is associated with a palpable radial sigmoid notch and a block to pronation.