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CSU BIOL 5515 Developmental Biology Chapter 5
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21
Biology
Undergraduate 4
02/16/2011

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Term
Centrolecithal
Definition
Describes an egg that contains dense yolk concentrated in the center.
Term
Cleavage
Definition
During embryogenesis, a rapid series of mitotic divisions of the zygote to form smaller cells.
Term
Convergent extension
Definition
The elongation of a cell layer in one dimension and shortening in another dimension.
Term
Cytokinesis
Definition
Division of the cytoplasm during cell division.
Term
Delamination
Definition
The splitting of one cellular sheet into two parallel sheets.
Term
Deuterostome
Definition
Species in which the blastopore forms the anus, and mouth forms from a later opening on the other end of the archenteron.
Term
Discoidal
Definition
Meroblastic cleavage restricted to a small disc of cytoplasm at the animal pole.
Term
Epiboly
Definition
The movement of an epithelial sheet as a unit to enclose deeper layers of an embryo.
Term
Gastrulation
Definition
During embryogenesis, the rearrangement of blastomeres to produce an embryo with 3 primary germ layers.
Term
Holoblastic
Definition
Cleavage in which the furrow extends through the entire egg.
Term
Ingression
Definition
The migration of individual cells from an epithelium into a cavity.
Term
Invagination
Definition
The infolding of an epithelium into an interior space.
Term
Involution
Definition
The inward movement of an expanding outer layer so that it spreads over the internal surface.
Term
Isolecithal
Definition
Describes an egg that contains sparse, evenly distributed yolk.
Term
Karyokinesis
Definition
Mitotic division of the nucleus.
Term
Meroblastic
Definition
Cleavage in which only part of the cytoplasm is cleaved.
Term
Mesolecithal
Definition
Describes and egg that contains moderate yolk toward one end.
Term
Primary mesenchyme
Definition
In sea urchins, micromere-derived cells that are the first to ingress into the blastocoel and later differentiate into skeletal spicules.
Term
Superficial
Definition
Meroblastic cleavage limited to a surface layer of cytoplasm at the periphery of the egg.
Term
Telolecithal
Definition
Describes an egg that contains dense yolk at one end.
Term
Protostome
Definition
Species in which the blastopore forms the mouth and the anus forms from a later opening into the embryo.
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