Multiple choice.
1. The nasal cavity is formed as:
The nasodeum appears just cephalic to the stomodeum, sinking in to meet the forming nasopharynx.
The lateral palatal shelves swing into position, dividing the oral cavity.
The nasal placodes sink into the face.
The foregut gives rise to a diverticulum that pushes forward, cephalic to the stomodeum.
Fusion of the maxillary processes with the mandibular buds occurs.
2. The oropharyngeal membrane (oral plate):
Ruptures to provide an opening between the developing nasal and oral cavities.
Is located at the anterior end of the gut tube, separating it from the stomodeum.
Is the initial indication on the developing face of the future mouth region.
Forms the union between the maxilla and the hard palate.
Marks the border between the developing esophagus and the pharynx.
3. The muscular and connective tissues of the duodenum develop from:
Splanchnic mesoderm.
Somatic mesoderm.
Endoderm.
The septum transversum.
The stomach.
4. Which of the following is true of the developing midgut region?
It is continuous with the allantois.
It is located between the anterior and posterior intestinal portals.
It gives rise to the liver, pancreas, and gallbladder.
Its floor never forms, remaining open into the umbilicus until after birth.
It extends from the esophagus to the rectum
5. The respiratory system stems from an evagination of the _____ surface of the digestive tract _____.
Ventral; ectoderm
Ventral; endoderm
Ventral; mesoderm
Dorsal; ectoderm
Dorsal; endoderm