Visible Human Transverse Section Through the HeadYou selected: ethmoid sinusThe ethmoid air sinuses lie behind the nasal passageways. These air cells are covered with an epithelium. Epithelial cells secrete mucous and help to warm and moisten air destined for the lungs.eye | lens | medial rectus | lateral rectus | ethmoid sinus | sphenoid sinus | nasal septum | temporalis muscle | brain | Information Module Name: a_vm1110 Module Title: Visible Human Transverse Section Through the Head Image Info: Gross specimen, transverse section Created by: Lynn Bry Contact Email:bryl@medicine.wustl.edu Last modified: Feb 4th, 1997 Created with Annotation 1.0 |