the study of the development of an animal from the fertilized egg until the organs are formed (fetus).
What is the purpose of the yolk?
nutrition of the early embryo.
Do just bird eggs have yolks?
no. mammalian eggs do, too
What is a zygote?
a fertilized egg
egg + sperm
What is a fetus?
an animal from the time organ systems are developed until the time it is born
Rapid division of the zygote is called _____.
cleavage
Name the solid mass of cells formed from the zygote by cleavage.
morula
As the embryo continues to grow, it develops into a hollow ball of cells called the _____.
blastula
The placenta is formed from _____ tissue.
fetal
What is implantation?
attachment of the embryo to the uterine wall
Further growth of the blastula results in development of three embryonic germ layers. List these three layers and briefly describe their relative locations.
ectoderm: outer layer
mesoderm: middle layer
endoderm: inner layer
Define epithelium.
covering of internal and external surfaces of the body
Define mesenchyma.
embryonic connective tissue
Define carcinoma.
malignant tumor derived from ectoderm and endoderm tissue
Define sarcoma.
malignant tumor derived from mesenchymal tissue
Define blastoma.
neoplasm composed of embryonic cells.
What structures are considered to be endothelium?
lining of heart, lining of blood and lymph vessels, lining of body cavities - pleura, peritoneum, pericardium
What layer is nervous tissue?
ectoderm
What layer is lymphoid tissue?
mesoderm
What layer is muscle?
mesoderm
What layer is the inner lining of the intestines - mucosa?