Advanced Dental Admission Test (ADAT)

The primitive choana connects which two cavities?

1. Oral and maxillary cavity

2. Nasal and pharyngeal cavity

3. Oral and nasal cavity

4. Sinus and middle ear cavity

The correct answer is: Oral and nasal cavity

The primitive choana, an embryonic structure, connects the oral cavity and the nasal cavity. This connection is critical during the development of the face and palate, as it allows for the early communication between these two essential structures. In the context of the options, the oral cavity is where food enters the body, while the nasal cavity is involved in respiration and olfaction. The primitive choana contributes to forming the primary palate and plays a significant role in the development of the secondary palate and the arrangement of the upper respiratory system. This anatomical connection is fundamental for understanding the development of craniofacial structures and the formation of the airways. As an individual develops, the primitive choana gives rise to the definitive choana, which serves as the primary passage between the nasal cavity and the pharynx in mature anatomy.