|
In the human embryo, the separation of the three
cavities of coelom is complete.
D1-7&E1-4
: The pericardial cavity.
Dl-7,
E1-7: The pleural cavity, almost the same
frames, indicating the nearby equal extent of the
two cavities at this stage, but also that
eventually the pleural cavities will become much
larger. E3-7: The diaphragm can be seen as a thin,
distinct membrane around the liver. Two derivatives
of the coelomic epithelium are to be observed
here.
E6-7,
F1-3: The adrenal glands. Notice the large
fetal cortex, (most of the gland) and the narrow
(more compact and darker staining) early permanent
cortex encapsulating it.
F1-3:
The spleen develops in the dorsal mesogastrium and
appears as a dense body on it lateral to the left
adrenal gland and kidney. Review in Endocrine
Development.
F3-7,
G1: The gonads are also in part derivatives
of the coelomic epithelium but they will be
discussed with the rest of the genital system.
G4-5:
The caudal extent of the peritoneal cavity; this
appears as the rectovesical pouch in the male or as
the rectouterine pouch in the female.
|
