. Anatomy of the cat. Cats; Mammals. THE SKULL. 25 The inner surface (Fig. 18) presents depressions for the convokitions of the cerebellum. The dorsal border is thick and rough for articulation with the parietals and interparietal. The ventral border abuts on the foramen magnum and is thin and smooth. Interparietal Bone. Os interparietale (Fig. 19).—This is a small triangular bone lying between the parietals, with its apex directed craniad, and its base in contact with the squamous portion of the occipital. Its dorsal surface is arrow-shaped and has its posterior border notched. It is marked b
. Anatomy of the cat. Cats; Mammals. THE SKULL. 25 The inner surface (Fig. 18) presents depressions for the convokitions of the cerebellum. The dorsal border is thick and rough for articulation with the parietals and interparietal. The ventral border abuts on the foramen magnum and is thin and smooth. Interparietal Bone. Os interparietale (Fig. 19).—This is a small triangular bone lying between the parietals, with its apex directed craniad, and its base in contact with the squamous portion of the occipital. Its dorsal surface is arrow-shaped and has its posterior border notched. It is marked by a median crest (part of the sagittal crest) which is continued craniad from the middle of the lambdoidal crest. The ventral surface is irregularly triangular, smooth, and concave. The three borders are rough for articulation with the parietals and e Fig. 19.—Interi'Arietal Fig. 20.—vSphenoid Bone, or Bone, Outer Surface. Internal Surface. Fig. 19, showing tiie sagittal crest running craniocaudad across its middle. Fig. 20.—a, body; A, wings; c, pterygoid process; d, tuberculum scllre; e, dor- sum scllcTe;/, sella turcica; ,(,>?, notch which aids in forming the foramen lacerum; //, longitudinal groove of alisphenoid; /, notch which aids in forming the orbital fissure;/, foramen rotundum; /', foramen ovale. Sphenoid Bone. Os sphenoidale (Fig. 20).—The sphe- noid bone of man is represented in the cat by two entirely distinct bones,—one cranial, the other caudal. The cranial portion may be designated as the presphenoid (Fig. 21); the caudal part will be described as the sphenoid (proper) (Fig. 20). The sphenoid bone in the kitten is in three parts: a central portion, the basisphenoid, and two lateral portions, the ali- sphenoids. In many lower vertebrates these three bones are permanently distinct, but in the adult cat they are united to form the sphenoid bone. To these there is added a fourth element, separate in many vertebrates as the pterygo
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