A manual of anatomy . y centers and three pairs of secondary primary centers appear about the sixth or seventh week of fetal life andform the bulk of the bone. The secondary centers appear later, one pair for thefrontal spine, one center for each zygomatic process and a center on each sideat the region of the trochlear pit. These centers fuse on each side by the seventh month of fetal life and the two hahes are usually fused by the seventhyear. Muscles Attached.—Mm. corrugator superciUi, orbicularis palpebras and tem-poralis (three pairs). THE PARIETAL BONES (OSSA PARIETAL
A manual of anatomy . y centers and three pairs of secondary primary centers appear about the sixth or seventh week of fetal life andform the bulk of the bone. The secondary centers appear later, one pair for thefrontal spine, one center for each zygomatic process and a center on each sideat the region of the trochlear pit. These centers fuse on each side by the seventh month of fetal life and the two hahes are usually fused by the seventhyear. Muscles Attached.—Mm. corrugator superciUi, orbicularis palpebras and tem-poralis (three pairs). THE PARIETAL BONES (OSSA PARIETALES) The two parietal bones form the lateral portions of the vault of thecranium. Each has tiuo surfaces, parietal and visceral, and fourmargins and foitr angles. The parietal surface is smooth and convex in both directions; its 44 OSTEOLOGY middle portion is quite bulged constituting the parietal tuberosity{tuber parietale). Between this and the inferior margin are two Sagittal borderParietal foramen Occipital angle. Mastoid angle Squamosal border Sagittal border SphenoidalangleFig. 22, ^ Parietal foramen Sagittal groove? Occipital angle
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
