Embryologically, the lower respiratory organs develop from the
A) olfactory pits.
B) laryngotracheal bud.
C) respiratory placode.
D) splanchnic ectoderm

Question

Quizplus · Accepted Answer

The lower respiratory organs develop from the laryngotracheal bud, which is an outgrowth of the ventral wall of the foregut at around 4-5 weeks of embryonic development. This bud eventually develops into the trachea, bronchi, and lungs. The olfactory pits are responsible for the sense of smell and are not involved in respiratory development. The respiratory placode is an area of thickened ectoderm that gives rise to the respiratory epithelium of the upper respiratory tract. The splanchnic ectoderm contributes to the development of certain structures in the head and neck, but not to the lower respiratory organs.

Embryologically, the Lower Respiratory Organs Develop from the