Which structure marked below would be responsible for spreading infection into anterior pa of the middle nasal meatus through the frontonasal duct?
The frontal sinus drains into the anterior pa of the middle nasal meatus frontonasal duct or infundibulum. A.- Cerebrospinal fluid (CSF) is formed by vascular choroid plexus in the ventricles in the brain; the letter "A" indicates the lateral ventricle. C.- The maxillary sinus lies lateral to the lateral wall of the nasal cavity and inferior to the floor of the orbit. B.- Mastoid air cells communicate with the middle ear cavity through the antrum and aditus. D.- The ethmoid sinus has numerous small cavities and lies between the orbit and the nasal cavity.
A
B
C
E
Eye, Nose and Ear