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If you define a placenta as a structure with which a mother may transfer nutrients to its young during their development up to the moment of free-living birth, then yes. For example the common smooth-hound (Mustelus mustelus), a small shark found in the UK is viviparous (gives birth to young instead of laying eggs) and has a placental connection via an umbilical cord to its pups before they are born. Note the starry smooth-hound (Mustelus asterias) also found in the UK has no placental structure but is viviparous, providing for its young via egg sacks. The Dogfish, another UK shark, is not viviparous and its eggs are the "mermaids' purses" we find washed up on the beach.
What else can I help you with?
Do tuna have placenta?
No, tuna fish do not have placentas. The placenta is part of mammal physiology, and fish are not mammals.
What do fish and premature babies breathing have in common?
Embryo's have gills to breathe inside placenta.
What is the medical term meaning abnormal implantation of the placenta?
Placenta previa, placenta accreta, placenta increta, and placenta increta are all conditions stemming from abnormal implantation of the placenta.
Do cats have a placenta?
Placenta comes out after each kitten.
To which structure does the umbilical cord connect the embryo?
The umbilical cord is attached to the placenta and the placenta is attached to the wall of the uterus
Can the placenta move during pregnancy?
Yes. But the movement is relative. Placenta does not change the position. But lower placenta may move up. So that placenta previa may become normal placenta.
Do lamprey have placenta?
No, lampreys do not have a placenta. They are a type of jawless fish that reproduce by laying eggs, and their young develop outside the mother's body. In contrast to mammals, which have placentas to nourish developing embryos, lampreys rely on external fertilization and do not provide maternal support during gestation.
Do kangaroos have a placenta?
Yes kangaroos have a placenta.
What is displaced placenta called?
Placenta Previa
Is a placenta attached to the front and the back of the uterus considered placenta prevea?
No, a placenta attached to the front and back of the uterus is not considered placenta previa. Placenta previa specifically refers to a condition where the placenta partially or completely covers the cervix. In contrast, a placenta that is attached to the front (anterior) and back (posterior) of the uterus may be referred to as a bilobed or multilobed placenta, but it does not indicate previa unless it is obstructing the cervical opening.
What is the meaning of 'unremarkable placenta'?
"Unremarkable placenta" means there was nothing special, different, or noteworthy about the placenta being examined.
What is an abnormal condition in which the placenta separates from the uterine wall before the birth of fetus?
Placenta abruptio or placental abruption is abnormal separation of the placenta from the uterine wall.
