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Amniotic sac

 
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The amniotic sac is the sac in which the fetus
Fetus

A fetus is a developing mammal or other viviparous vertebrate, after the embryonic stage and before childbirth. The plural is fetuses, or sometimes feti....
 develops in amniotes.

Some sources consider it to be equivalent to the amnion
Amnion

The amnion is a membranous sac that surrounds and protects an embryo. It is developed in reptiles, birds, and mammals, which are hence called ?Amniote?; but not in amphibians and fish, which are consequently termed ?Anamniota?....
..

When in the light, the amniotic sac is shiny and very smooth, but too tough to pierce through.

rtificial rupture of membranes (ARM), also known as an amniotomy, may be performed by a midwife or obstetrician
Obstetrics

Obstetrics is the surgery speciality dealing with the care of a woman and her offspring during pregnancy, childbirth and the puerperium . Midwifery is the non-medical equivalent....
. This is usually performed using an amnihook and is intended to induce or accelerate labour.

presence of the amnion identifies humans and other mammal
Mammal

Mammals are a class of vertebrate animals whose name is derived from their distinctive feature, mammary glands, with which they feed their young....
s as amniote
Amniote

The amniotes are a group of tetrapod vertebrates that have a terrestrially adapted egg. They include the Synapsida and Sauropsida . Amniote embryos, whether laid as eggs or carried by the female, are protected and aided by several extensive membranes....
s, along with reptile
Reptile

Reptiles, or members of the class Reptilia, are air-breathing, cold-blooded vertebrates that have skin covered in scale as opposed to hair or feathers....
s, dinosaur
Dinosaur

Dinosaurs were the dominant vertebrate animals of Landform ecosystems for over 160 million years, from the late Triassic Period until the end of the Cretaceous Period , when most of them became extinct in the Cretaceous?Tertiary extinction event....
s, bird
Bird

Birds are wing, Bipedalismal, endothermic , vertebrate animals that lay egg . There are around 10,000 living species, making them the most numerous tetrapod vertebrates....
s but not amphibian
Amphibian

Amphibians , such as frogs, toads, salamanders, newts and caecilians, are cold-blooded animals that metamorphose from a juvenile, water-breathing form to an adult, air-breathing form....
s nor fish
Fish

A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
.

Amniotic fluid Amniotic fluid
Amniotic fluid

Amniotic fluid or liquor amnii is the nourishing and protecting liquid contained by the amnion of a pregnant woman.Amnion grows and begins to fill, mainly with water, around two weeks after fertilization....
 is the watery liquid surrounding and cushioning a growing fetus within the amnion.






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The amniotic sac is the sac in which the fetus
Fetus

A fetus is a developing mammal or other viviparous vertebrate, after the embryonic stage and before childbirth. The plural is fetuses, or sometimes feti....
 develops in amniotes.

Some sources consider it to be equivalent to the amnion
Amnion

The amnion is a membranous sac that surrounds and protects an embryo. It is developed in reptiles, birds, and mammals, which are hence called ?Amniote?; but not in amphibians and fish, which are consequently termed ?Anamniota?....
..

When in the light, the amniotic sac is shiny and very smooth, but too tough to pierce through.

Amniotomy

An artificial rupture of membranes (ARM), also known as an amniotomy, may be performed by a midwife or obstetrician
Obstetrics

Obstetrics is the surgery speciality dealing with the care of a woman and her offspring during pregnancy, childbirth and the puerperium . Midwifery is the non-medical equivalent....
. This is usually performed using an amnihook and is intended to induce or accelerate labour.

Diversity

The presence of the amnion identifies humans and other mammal
Mammal

Mammals are a class of vertebrate animals whose name is derived from their distinctive feature, mammary glands, with which they feed their young....
s as amniote
Amniote

The amniotes are a group of tetrapod vertebrates that have a terrestrially adapted egg. They include the Synapsida and Sauropsida . Amniote embryos, whether laid as eggs or carried by the female, are protected and aided by several extensive membranes....
s, along with reptile
Reptile

Reptiles, or members of the class Reptilia, are air-breathing, cold-blooded vertebrates that have skin covered in scale as opposed to hair or feathers....
s, dinosaur
Dinosaur

Dinosaurs were the dominant vertebrate animals of Landform ecosystems for over 160 million years, from the late Triassic Period until the end of the Cretaceous Period , when most of them became extinct in the Cretaceous?Tertiary extinction event....
s, bird
Bird

Birds are wing, Bipedalismal, endothermic , vertebrate animals that lay egg . There are around 10,000 living species, making them the most numerous tetrapod vertebrates....
s but not amphibian
Amphibian

Amphibians , such as frogs, toads, salamanders, newts and caecilians, are cold-blooded animals that metamorphose from a juvenile, water-breathing form to an adult, air-breathing form....
s nor fish
Fish

A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
.

Amniotic fluid Amniotic fluid
Amniotic fluid

Amniotic fluid or liquor amnii is the nourishing and protecting liquid contained by the amnion of a pregnant woman.Amnion grows and begins to fill, mainly with water, around two weeks after fertilization....
 is the watery liquid surrounding and cushioning a growing fetus within the amnion. It allows the fetus to move freely without the walls of the uterus
Uterus

The uterus is a major female hormone-responsive reproductive sex organ of most mammals, including humans. It is within the uterus that the fetus develops during gestation....
 being too tight against its body. Buoyancy is also provided.

See also

  • Caul
    Caul

    A caul is a thin, filmy biological membrane, the amniotic sac, that covers or partly covers the newborn mammal immediately after birth....


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