Morphological Studies on the Union of the Frontal Bone:Blood Vessels in the Non-obliterated Frontal Suture
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An attempt was made to elucidate some of the fine structures of the frontal suture which have not been demonstrated by previous investigators. Fortynine skulls were used, and the frontal suture was studied by light and scanning electron microscopy. The following rosults were obtained.<BR>1) The connective tissue including collagen fibers which indicated the nonobliterated frontal suture connected the right frontal bone with the left one, and entered into the crevice in a wedge.<BR>2) Comparatively large vessels were found along the direction of longitudinal fibers in the connective tissue of the crevice.<BR>3) The tissue in the suture was in close contact with the periosteum, and the vessels in the tissue united with the emissary veins.<BR>4) The blood vessels in the Haversian system of the compact bone near the frontal suture were mostly obliterated, so that bone formation stopped and the frontal suture remained in non-obliteration.<BR>5) In the frontal section of the embryonal frontal bone, the blood vessels were few at the marginal part near the frontal suture.<BR>6) The state of the bone union in the frontal suture was classified into three types based on scanning electron microscopy: (1) The margins towards the mediam line between the right and left frontal bone were almost united in the same form. (2) The external surface of one margin of the suture appeared to be convex and the surface was overlapped by the other margin. (3) Many small pores were present in a row at the frontal suture.<BR>7) Crystalloid substance considered to represent a deposit of bone components was seen in the fractured surface of the frontal bone.
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