(redirected from retractor muscles)
Also found in: Thesaurus, Medical, Encyclopedia.


One that retracts, as:
a. Anatomy A muscle, such as a flexor, that retracts an organ or a part.
b. Medicine A surgical instrument used to hold back organs or the edges of an incision.


1. (Anatomy) anatomy any of various muscles that retract an organ or part
2. (Surgery) surgery an instrument for holding back the edges of a surgical incision or organ or part
3. a person or thing that retracts


(rɪˈtræk tər)

1. a person or thing that retracts.
2. Surg. an instrument for drawing back the edges of an incision.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.retractor - surgical instrument that holds back the edges of a surgical incisionretractor - surgical instrument that holds back the edges of a surgical incision
surgical instrument - a medical instrument used in surgery
References in periodicals archive ?
The povlg1-positive cells were observed symmetrically on the sections at the point of connection of both pedal retractor muscles in the shells of 1-mo-old oysters (2-5 mm shell height, n = 5).
Cross sections through the body column also revealed limited, scattered expression in the gastrodermis of the body wall, but there was a robust signal in cells adjacent to the parietal and retractor muscles, as well as in the gonadal region of the mesentery (Fig.
In this regard Arion, the Holarctic type genus of Arionidae, exhibits relatively advanced character states with, amongst others, the shell being almost totally degenerated and the retractor muscles of the left and right sides shortened to such a degree that they originate independently from the dorsolateral body wall.
Blood drainage from the penis is done by external pudendal vein and internal pudendal vein and venous blood in deep vein penis, bulbar vein and dorsal penile vein enter to internal pudendal vein and then internal iliac and finally coudal vena cava, and the external pudendal vein blood prepuce, skin, corpus spongiosum penis and ischiocavernosus, bulbospongiosus and retractor muscles and free part penis through dorsal vein drainage (Fig7,8).
Upper and lower lid retraction can be improved by lengthening the tendons of the eyelid retractor muscles and this is usually performed under local anaesthetic, allowing greater accuracy in positioning the lids.
The proboscis is withdrawn into its sheath using retractor muscles that insert on the nodus and originate within the body beyond the post-rostral bulb septum (Karling, 1961).
The disposition of the pedal and byssus retractor muscles was considered particularly important for the definition of genera.