nasolacrimal

Actually, given the holes in your nose leading to the pharynx, the holes in your nasolacrimal ducts leading to your nose, and the assorted other sorts of holes in your body, you are a bit more complex than a doughnut--we're closer to pretzels.

A topologist's view of the body

In front of the opening of the sinus is a deep groove, the lacrimal groove, which is converted into the nasolacrimal canal, by the lacrimal bone and inferior nasal concha; this canal opens into the inferior meatus of the nose and transmits the nasolacrimal duct.

II. Osteology. 5b. 2. The Maxillæ (Upper Jaw)

From this last anastomoses a branch passes to the nasolacrimal duct, ramifying in its mucous membrane, as far as the inferior meatus of the nasal cavity.

VI. The Arteries. 3a. 4. The Internal Carotid Artery

It extends almost the entire length of the lateral wall of the nose, is broader in front than behind, and presents anteriorly the lower orifice of the nasolacrimal canal.

II. Osteology. 5d. The Interior of the Skull

The direction of the nasolacrimal duct is indicated by a line from the lacrimal sac to the first molar tooth of the maxilla; the length of the duct is about 12 or 13 mm.

XII. Surface Anatomy and Surface Markings. 2. Surface Markings of Special Regions of the Head and Neck

The opening of the nasolacrimal duct, which lies under cover of the front of the inferior nasal concha, is situated about 2.5 cm. behind the naris and 2 cm. above the level of the floor of the nasal cavity.

XII. Surface Anatomy and Surface Markings. 2. Surface Markings of Special Regions of the Head and Neck

At its medial angle is the upper opening of the nasolacrimal canal, immediately to the lateral side of which is a depression for the origin of the Obliquus oculi inferior.

II. Osteology. 5c. The Exterior of the Skull

It will thus be seen that there are nine openings communicating with each orbit, viz., the optic foramen, superior and inferior orbital fissures, supraorbital foramen, infraorbital canal, anterior and posterior ethmoidal foramina, zygomatic foramen, and the canal for the nasolacrimal duct.

II. Osteology. 5c. The Exterior of the Skull

The inferior is divided by the lower edge of the posterior lacrimal crest into two parts: the posterior part articulates with the orbital plate of the maxilla; the anterior is prolonged downward as the descending process, which articulates with the lacrimal process of the inferior nasal concha, and assists in forming the canal for the nasolacrimal duct.

II. Osteology. 5b. 3. The Lacrimal Bone

From the nasal cavity its continuity with the conjunctiva may be traced, through the nasolacrimal and lacrimal ducts; and with the frontal, ethmoidal, sphenoidal, and maxillary sinuses, through the several openings in the meatuses.

X. The Organs of the Senses and the Common Integument. 1b. The Organ of Smell