The gender is determined by the article, either definite (the in English) or indefinite (a/an in English). 1  Masculine definite article: le [leu]. 2  Feminine definite article: la.3  Masculine indefinite article: un [nasal sound which can be derived from the English sound un as explained in the first lesson].he gender is determined by the article, either definite (the in English) or indefinite (a/an in English). 1  Masculine definite article: le [leu]. 2  Feminine definite article: la.
Frontal sinus. The frontal sinuses are pockets of space located above the orbit of each eye in the frontal bone. They are lined with mucus membrane, which secretes fluid that moistens and protects the areas it covers. The size and shape of the frontal sinus can vary from person to person.These spaces fill up with mucus, which then drain into the nose. The draining process can be hindered by blockages. If mucus accumulates, this can cause infections.hey are lined with mucus membrane, which secretes fluid that moistens and protects the areas it covers. The size and shape of the frontal sinus can vary from person to person. These spaces fill up with mucus, which then drain into the nose.
Sphenoid sinus Medically reviewed by Healthline Medical Team on January 27, 2015 Sinuses are air-filled sacs (empty spaces) on either side of the nasal cavity that filter and clean the air breathed through the nose and lighten the bones of the skull. There are four paired sinuses in the head. The most posterior (farthest toward the back of the head) of these is the sphenoid sinus. The sphenoid sinuses are located in the sphenoid bone near the optic nerve and the pituitary gland on the side of the skull. There are seven bones that form the orbit (eye socket), and the sphenoid is one of these bones. The pituitary gland, which produces many different hormones that control other glands, is housed in the sphenoid bone.