#july2020usmle2ck
The tracheal tube is originated from which of the following structures?
A- Ductus arteriosus
B- Foregut
C- Fourth pharyngeal arch
D- Third pharyngeal arch
The tracheal tube is originated from which of the following structures?
A- Ductus arteriosus
B- Foregut
C- Fourth pharyngeal arch
D- Third pharyngeal arch