notch

(redirected from sigmoid notch)
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Related to sigmoid notch: submandibular fossa, malar process

notch

US and Canadian a narrow pass or gorge

notch

[näch]
(electronics)
Rectangular depression extending below the sweep line of the radar indicator in some types of equipment.
(engineering)
A V-shaped indentation or cut in a surface or edge.
(geology)
A deep, narrow cut near the high-water mark at the base of a sea cliff.
(geography)
A narrow passage between mountains or through a ridge, hill, or mountain.

notch

A cutout in a log or timber, usually at or near one of its ends, that is used to form a rigid joint when mated with another appropriately cutout log or timber at right angles to it; for example, at the corners of a log cabin or log house. See corner notch, diamond notch, double-saddle notch, dovetail notch, half-cut notch, half-dovetail notch, halved-and-lapped notch, lap notch, log notch, round notch, saddle notch, single notch, single-saddle notch, square notch, V-notch.
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.