. The anatomy of the human body. Human anatomy; Anatomy. THE FACE IN GENERAL. 63 The nasal fossae have a horizontal direction, but are nevertheless slightly inclined backward and downward ; this is caused by the sloping of the inferior wall and the ob- liquity of the body of the sphenoid, which forms part of the superior wall. They are irregular cavities, and have four walls; a superior, an inferior, an internal, and an ex- ternal ; and two orifices, an anterior and a posterior. The superior wall or roof of the nasal fossa presents a concavity looking downward : it is formed, 1. In front by th
. The anatomy of the human body. Human anatomy; Anatomy. THE FACE IN GENERAL. 63 The nasal fossae have a horizontal direction, but are nevertheless slightly inclined backward and downward ; this is caused by the sloping of the inferior wall and the ob- liquity of the body of the sphenoid, which forms part of the superior wall. They are irregular cavities, and have four walls; a superior, an inferior, an internal, and an ex- ternal ; and two orifices, an anterior and a posterior. The superior wall or roof of the nasal fossa presents a concavity looking downward : it is formed, 1. In front by the proper bones of the nose, and in a small degree by the na- sal spine of the frontal bone. 2. In the middle, by the cribriform plate of the ethmoid. 3. Behind, by the body of the sphenoid. In this wall are two transverse sutures, name- ly : before, the suture which indicates the union of the nasal and frontal bones, and be- hind, that which marks the union of the ethmoid and sphenoid. At the back part of this wall the opening of the sphenoidal sinus is seen. The inferior wall ox floor, much broader but shorter than the superior, presents a trans- verse concavity ; it is directed from before backward, and slightly from above downward, which arrangement concurs in determining the obliquity of the nasal fossae. It is form- ed, in front by the superior maxilla; behind, by the palate bone; a transverse suture marks the union of these bones. Near its anterior extremity, and at the side of the me- dian line, the floor of the nasal fossae shows the superior orifice of each branch of the an- terior palatine canal {g, fig. 22, and o, fig. 37). The internal wall (see fig. 22) formed by the septum is generally flat, but sometimes concave or convex, according as it is bent to one or the other side.* We find here the suture which indicates the union of the vomer with the perpendicu- lar plate of the ethmoid (3 4, Jig. 22); the septum in the skeleton is deeply notched in front, and this notc
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