divaricator

One of the muscles that open the shell of a brachiopod; a cardinal muscle.

The relative position of the adductor and divaricator impressions varies somewhat in different species of the genus, as we have already described; thus, in P. giganteus, P. longispinus, &c., the divaricators are situated immediately under and outside of the adductor, while in P. pustulosus, P. humerosus, &c., the adductor is located between the two divaricator impressions, as in the case of P. comoides.

The interior of the ventral valve differs from the dorsal one by having its divaricator scars much narrower, and its occlusor impressions closer at the anterior extremity, and leaving only a very small space between them for the two little scars which Mr. Hancock thinks might belong to the anterior extremity of the dorsal adjustor.

A surgical device for spreading the surroundings and holding open the area in which one is operating.

An operation case containing: 1. A tongue forceps. 2. Heister's gag. 3. Author's ringed gag. 4. Three Krishaber's tracheotomoy tubes for children and adults. 5. One divaricator of the commissure. 6. One divaricator of the molars. […]

In 1987, Griffith12 proposed an endonasal sphenoidotomy through a sphenoethmoidal recess. Here it is also necessary to use a divaricator.