Titlebook: Embryology; Robert E. Coalson,James J. Tomasek Textbook 1992Latest edition Springer-Verlag New York, Inc. 1992 birth.development.embryo.em

GEST

Respiratory System,s) and cephalic levels of the pharyngeal foregut (nasopharynx); the lower respiratory passages (larynx, trachea, bronchi) and lungs develop from a respiratory primordium originating from the ventral wall of the pharynx.

不连贯

Cardiovascular System,ays), a primitive ‘ebb and flow’ circulation has been established; by the end of the fourth week (28 days), the blood has begun to circulate, regularly and unidirectionally, through the embryonic and extraembryonic (placental) vessels.

forebear

chronicle

invulnerable

Mit transformativer Autorität in FührungThe urinary system develops from the . (nephrotome) connecting the segmented and nonsegmented (lateral plate) mesoderm. The genital system (gonads and genital ducts) also develop from intermediate mesoderm but the primordial germ cells originate in the yolk sac and subsequently migrate to populate the developing gonads.

极大的痛苦

流眼泪

Nervous System,The presence of a notochord is necessary for initiating development of the nervous system, however, complete histological differentiation also requires the presence of segmented paraxial mesoderm (somites).

亲密

Indebted

Dictation

978-0-387-97776-8Springer-Verlag New York, Inc. 1992