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that part of the fetus lying over the pelvic inlet; the presenting body part of the fetus. See also position and lie.
breech presentation presentation of the fetal buttocks, knees, or feet in labor; the feet may be alongside the buttocks (complete breech presentation); the legs may be extended against the trunk and the feet lying against the face (frank breech presentation); or one or both feet or knees may be prolapsed into the maternal vagina (incomplete breech presentation).
antigen presentation presentation of ingested antigens on the surface of macrophages near histocompatibility antigens; see also antigen presentation.
cephalic presentation presentation of any part of the fetal head in labor, whether the vertex, face, or brow.
compound presentation prolapse of one of the limbs of the fetus alongside the head in cephalic presentation or of one or both arms alongside a presenting breech at the beginning of labor.
footling presentation presentation of the fetus with one foot (single footling) or two feet (double footling) prolapsed into the maternal vagina.
funic presentation presentation of the umbilical cord in labor.
placental presentation placenta praevia.
shoulder presentation presentation with the fetal shoulder as the presenting part; see oblique lie and transverse lie.
transverse presentation transverse lie.
presentation of any part of the pelvic extremity of the fetus, the nates, knees, or feet; more properly only of the nates; frank breech presentation occurs when the fetus presents by the pelvic extremity; the thighs may be flexed and the legs extended over the anterior surfaces of the body; in full breech presentation, the thighs may be flexed on the abdomen and the legs upon the thighs; and in footling presentation, foot presentation, the feet may be the lowest part; in incomplete foot presentation, incomplete knee presentation, one leg may retain the position that is typical of one of the above-mentioned presentations, while the other foot or knee may present.
Synonym(s): pelvic presentation
The position of a fetus during labor in which the buttocks or feet appear first.
Etymology: ME, brech + L, praesentare, to show
breech presentationObstetrics Buttocks position at the time of delivery, a position that carries a 3-6-fold ↑ mortality due to complications–umbilical cord prolapse, tentorial tearing, cerebral hemorrhage of after-coming head; in the US, BPs are usually delivered by C-section. See Cesarean section.
breech pres·en·ta·tion(brēch prez'ĕn-tā'shŭn)
Presentation of any part of the pelvic extremity of the fetus, the nates, knees, or feet; more properly only of the nates; frank breech presentation occurs when the fetus presents by the pelvic extremity; the thighs may be flexed and the legs extended over the anterior surfaces of the body; in full breech presentation, the thighs may be flexed on the abdomen and the legs on the thighs, in footling presentation, the feet may be the lowest part; in incomplete foot presentation, incompleteknee presentation, one leg may retain the position which is typical of one of the above-mentioned presentations, whereas the other foot or knee may present.
The condition in which the baby enters the birth canal with its buttocks or feet first.
the buttocks of an animal; the backs of the thighs.
presentation of the buttocks of the fetus during parturition. See also presentation.
lie; the relationship of the long axis of the fetus to that of the dam. In foals and ruminants the normal presentation of a fetus during parturition is with the forelimbs extended forward so that the hooves are presented first, followed by the head between the forearms, followed by the trunk, abdomen and lastly the hindlimbs extended backward, i.e. anterior presentation.
In piglets the usual presentation is the nose first followed by the shoulders with the forelimbs beside the trunk, followed by the hindlimbs extended backward. The nose of puppies and kittens is presented first with the front paws forward under the neck and chin.
presentation of the front feet and limbs followed by the fetal head in labor.
presentation of the fetal buttocks and tail in labor.
presentation of the umbilical cord in labor.
the fetus is presented with the forelimbs retained and the neck flexed so that the poll is presented in the cervix.
the hindfeet are presented followed by the hindlimbs and hindquarters and tail; a normal variation in dogs and pigs.
at birth the fetus is presented at the pelvic inlet with its long axis running across the long axis of the pelvic canal in the dorsotransverse position. It is the back of the fetus that can be palpated. There are no fetal parts with which to effect a correction.
ventral head presentation
the fetus presents with the head and neck flexed beneath the body. Called also neck flexion.