noun

definition

One who, or that which, retracts.

definition

In breech-loading firearms, a device for withdrawing a cartridge shell from the barrel.

definition

A chess puzzle in which a number of moves are retracted and the solver is challenged to reach an alternate outcome.

definition

A surgical instrument used to hold apart the edges of an incision or wound.

definition

A bandage to protect soft parts of the body from injury by a surgical saw.

definition

A muscle serving to draw in any part.

Examples of retractor in a Sentence

In the posterior retractor the longitudinal fibres become united into one bundle, which, as noticed above, is inserted in the wall of the sheath.

Each taeniola bears a strongly developed longitudinal muscle-band, stated by Claus and Chun to be developed from the endoderm, like the retractor muscles of the anthopolyp, but by other investigators it is affirmed that each retractor muscle of the scyphistoma arises from the lining of a funnel-shaped ectodermal ingrowth (" Septaltrichter ") growing down from the peristome inside each taeniola, in a manner similar to the infundibular cavities of Lucernaria, which in their turn are homologous with the sub f genital cavities of Scypho l A .` medusae.

The mesenteries are provided with well-developed longitudinal retractor muscles, supported on longitudinal folds or plaits of the mesogloea, so that in cross-section they have a branched appearance.

Figure 3 A medium sized soft tissue retractor is seen inserted into the 6cm working port.

The heart and vascular system are similar to those of the Neomeniomorpha, the only important differences being that the ventricle is nearly free in the pericardial cavity, and that the latter is traversed by the retractor muscles of the gills.

We can also understand the dominance of the retractor muscles from this point of view.

A rectal retractor can remove objects that a physician can feel during a digital examination of the rectum.

On the inner surface is a layer of peritoneal epithelium, which is frequently ciliated, and at the bases of the retractor muscles is heaped up and modified into the reproductive organs.

Sipunculoids are dioecious, and the ova and spermatozoa are formed from the modified cells lining the body-cavity, which are heaped up into a low ridge running along the line of origin of the retractor muscles.

Two retractor muscles pass back from the base of the foot to the dorsal side of the shell.

The proximal portion forms the retractor muscles of themanubrium, or proboscis, well developed, for example, in Geryonia.

Besides the circular subumbral muscles, there may be others running in a radial direction, chiefly developed as the longitudinal retractor muscles of the manubrium.

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