Development 2 Flashcards

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1
Q

morula

A

humans:
After fertilization the egg divides rapidly to form morula

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2
Q

blastocyst

A

blastula stage of mammalian embryonic development, has inner cell mass, a cavity, and an outer layer (trophoblast). in humans: forms 1 week after fert.

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3
Q

trophoblast

A

Outer cells of blastocyst. Forms the fetal part of the placenta, supporting embryonic development but not forming part of the embryo proper

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4
Q

Inner cell mass (ICM)

A

inner cluster of cells at one end of mammalian blastocyst that subsequently develops into the embryo proper and some of the extraembryonic membranes

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5
Q

epiblast

A

Deep cells of ICM form epiblast.
Becomes ectoderm with fluid filled space (the amniotic cavity)
some will migrate during gastrulation to form the mesoderm]

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6
Q

hypoblast

A

ICM cells close to blastocoel form hypoblast.
become the endoderm

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7
Q

amnion

A

fluid filled membrane that protects the egg. Keep embryo from drying out.

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8
Q

amniotes

A

member of a clade of tetrapods. all have amniotic egg that has specialized membranes (fluid filled amnion) that protect the embryo. They are mammals, birds & other reptiles.

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9
Q

placenta

A

structure in uterus of pregnant eutherian mammal that nourishes the fetus with the mothers blood supply. Made from uterine lining & embryonic membranes.

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10
Q

chorion

A

Functions as gas exchange with egg shell
Made from extraembryonic ectoderm & mesoderm

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11
Q

yolk sac

A

Contains the yolk nutrients & eventually forms vessels to deliver them.
Derive from endoderm & mesoderm.

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12
Q

Allantois

A

Disposes of waste products & helps with gas exchange.
Derive from endoderm & mesoderm.

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13
Q

Continuous development

A

The newborn is smaller version of adult. Many animals.
Trees

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14
Q

Discontinuous development

A

Multiple unique stages in life cycle.
Lady bird beetle.
Egg, larvae, pupa, adult

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15
Q

metamorphosis

A

in discontinuous development, this turns animal larva into adult or adult like stage that is not yet sexually mature(instar)

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