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G6-G7:
The extent of the coelomic cavity is best seen on
the sagittal sections of the pig embryo. G7:
identify the pericardial cavity and its
continuation posteriorly into the still small
pleural cavity (pleuroperitoneal canals).The
pleuroperitoneal (pericardio-peritoneal) canal.
G6:
one of the lung buds is seen embedded in the dense
tissue that is surrounded by the coelomic
cavity.The abdominal (peritoneal) cavity is clearly
continuous with the extra embryonic coelom and
parts of the intestinal loop and accompanying
mesentery are visible entering the umbilical
region.
C5:
The most cranial part of the coelom visible in
cross sections is the pericardial cavity and from
this level caudally it can be seen extending to the
level of the liver, but anterior to it (D6). B7-C5:
Posteriorly and cranially this cavity communicates
with the primitive pleural cavity which are two
canals connecting the pericardial and peritoneal
cavities (C6-7, D1-6).
C5-7:
These two channels are separated from the
pericardium by a fold containing the common
cardinal veins either side. (Pleuropericardial
folds - see development of diaphragm).
D2-6:
The peritoneal cavity is extensive; it consists of
two, adjoining halves and a small cranial
outpocketing next to the stomach, the lesser sac.
Further caudally this cavity extends as far as the
region of the urorectal septum E7 (tail). Much of
the peritoneal cavity is occupied by the two parts
of the mesonephros, which reduce most of the cavity
to two crescent-shaped clefts.
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