Biology Questions and Answers
- After the neurula stage
and from its ventral portion to
the dorsal how can the
morphology of the embryo be
described?
In a schematicthe embryo after the neurula stag longitudinal section e, theof (^)
outermost layer of cells is the ectoderm.
In the ventral rarchenteron tube formed of endodermalegion comes the (^)
cells. In both sides of the embryo
coeloms delimited bpresent. In the central region above they mesoderm are (^)
archenteron and in the middle of the
coeloms there is the notochord. dorsal region just above the notochorIn thed (^)
lies the neural tube.
- What are somites?
Somites armesodermal tissue lone differentiated pgitudinallyortions o f
distributed along the embryo. The
somites oriportions of the connective tissues.ginate the muscle tissue and
- What are histogenesis and
organogenesis?
Histogenesis is the process of tissueformation in the embryonic
development. Organogenesis is theprocess of organ formation. Before
histogenesis and organogenesis the
primitivebeen already formed: germ layers, embryonic structures have
neural tube, notochorsomites. d, coeloms,
- From which germ layer do
the epidermis and the nervous
system originate? What are
other organs and tissues made
from that germ layer?
Epidermis ansame embryonic orid nervous systemgin: the ectoderm. have the
The epidermal appendages (like nails,
hair, sweat glaglands), the mammary nds and sebaceousglands, the (^)
adenohypophysis, the cornea, the
crystalline lederived from ectoderm.ns and the retina are also
- From which germ layer do
blood cells originate? What
are other organs and tissues
made from that germ layer?
Blood cells have a mesodermalembryonic origin. Other organs made (^)
from mesoderm are: covering serous
membranes like peritoneum and the pleura, mthe pericardium, thuscles,e
cartilages, dermis, adipose tissue,
kidneys, ugonads, blood and lymph reters, bladder, urethra,vessels,
bones.
- From which germ layer do
the liver and the pancreas
originate? What are other
organs and tissues made from
that germ layer?
The liver and the pancreas aroriginated from the endoderm. Alsoe (^)
from endodermal oriof the airway, the epithelia ogin are the epitheliaf the
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