Opening of frontal sinus - Apertura sinus frontalis



In front of the ethmoidal notch, on either side of the frontal spine,

This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from

Anatomical hierarchy

General Anatomy > Bones; Skeletal system > Axial skeleton > Cranium > Frontal bone > Frontal sinus > Opening of frontal sinus