Body Folding and Body Cavities Flashcards
Small spaces form in the lateral plate mesoderm and grow to from a horseshoe shaped cavity known as?
Intraembryonic coelom
During embryonic head folding, what part of the endoderm will form?
During embryonic tail folding, what part of the endoderm will form?
During embryonic lateral folding, what part of the endoderm will form?
1) Foregut
2) Hindgut
3) Midgut
During head folding, the developing brain overgrows?
After head folding, what are the relative locations of the septum transversum, heart, and oropharyngeal membrane from anterior to posterior?
1) Oropharyngeal Membrane
2) Oropharyngeal Membrane, Heart, Septum Transversum
During embryonic tail folding, the caudal eminence (tail region) overgrows the?
This forces the primitive streak, cloacal membrane, and allantois in what direction?
The terminal hindgut dilates to form the?
1) Cloacal membrane
2) Ventrally
3) Cloaca
What happens during lateral folding?
What happens to the communication between the intraembryoinc and extraembryonic coelomic cavities?
1) Lateral folds migrate and fuse anteriorly
2) Separate
The embryo grows into the median and horizontal planes simultaneously around?
4th week/ day 22
What does the allantois and connecting stalk become? What does hindgut become? What does cloaca become? What does cloacal membrane become? What does stomodeum become? What do bronchial buds become? What do peritoneal canals become? What does the septum transversum become? What does the dorsal mesentery become?
1) Umbilical cord
3) Descending colon/rectum
4) Urinary bladder/rectum
5) Future anus
6) Future mouth
7) Lungs
8) Pleural cavities
9) Central tendon of diaphragm
10) Crura of diaphragm
What is the intraembryonic coelom divided into?
1) Two pericardial cavity
2) Pleural cavities
3) Peritoneal cavity
What separates the pericardial cavity from the peritoneal cavity?
The septum transversum and the pleuroperitoneal membrane coming together to form the thoracic diaphragm.
What layer of lateral mesoderm is continuous with extraembryonic mesoderm covering umbilical vesicle?
What layer of lateral mesoderm is continuous with extraembryonic mesoderm covering amnion?
1) Splanchnic layer
2) Somatic layer
The foregut, midgut, and hindgut are held in place in the peritoneal cavity by?
This structure is also the median portion of the?
1) Dorsal mesentery
2) Diaphragm
The pleuropericardial and pleuroperitoneal folds come from what mesoderm?
Somatic
Bronchial buds will become lungs and grow and invade into what area?
This produces?
Lungs will developing area between?
1) Pericardioperitoneal canals
2) Pleuropericardial and pleuroperitoneal folds
3) Pleuropericardial and pleuroperitoneal membranes
What is the splanchnopleura made of?
What is the somatopleura made of?
1) Splanchnic mesoderm and endoderm
2) Somatic mesoderm and ectoderm
The parietal wall of cavities is made from?
The visceral wall of cavities is made from?
1) Somatic mesoderm
2) Splanchnic mesoderm
