retractor

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surgical instrument that holds back the edges of a surgical incision

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Here we describe an obliquely striated invertebrate muscle, the nuchal retractor muscle (NRM) of squids and cuttlefishes, which is activated in different ways during locomotion: at the start of muscle shortening, periodically during muscle lengthening, and occasionally during brief periods of muscle isometry.
antagonism of the NRM) is accomplished presumably by contraction of the transverse or circumferential muscle fibers of the muscular hydrostatic head retractor muscle, possibly in combination with the hydrostatic pressure of the mantle cavity.
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).
The povlg1-positive cells were also observed on the sections at the point of separation of the pedal retractor muscles (Fig.
Some of fibres of penis retractor muscle extend past its insertion on to first region to insert on to pocket carrying giant spine.
One, [alpha]238305, is expressed near the pharynx, parietal muscle, and retractor muscle, suggesting a role in the adhesion of myonemes to the extracellular matrix.
The proboscis is withdrawn into its sheath using retractor muscles that insert on the nodus and originate within the body beyond the post-rostral bulb septum (Karling, 1961).
tuberculata coccinea, from trochophore stage to torsion differs to that of other species because the formation of the larval retractor muscle, the integumental attachment, and the development of the foot mass occurred simultaneously in the present species.
Crofts' explanation [4, 5] of the mechanism initiating developmental rotation in the trochid gastropod Calliostoma zizyphinum, the abalone Haliotis tuberculata, and the patellid limpet Patella vulgata involved contraction of a larval retractor muscle and assumed that the larval shell on which the muscle is inserted is calcified or at least rigid.
Development rate of hatch-out, formation of larval retractor muscle, 90 degree torsion and formation of epipodial tentacle were recorded.
The action of serotonin on calcium-45 efflux from the anterior byssal retractor muscle of Mytilus edulis.
tuberculata: the larval (or velar) retractor muscle and the future columellar muscle.
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).
The disposition of the pedal and byssus retractor muscles was considered particularly important for the definition of genera.
A recently described motor pattern in the pupa (4, 5) is characterized by rhythmical activity in the larval accessory planta retractor muscles (APRMs) that is synchronous between abdominal segments 2 (A2) and 3 (A3).