Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 6 On the Eight Bones of the Head and the Sutures Connecting Them

The borders of the frontal bone

The frontal bone (L in figs. 3, 4; circumscribed by B, A, b, g, g; in fig. 6, following h, L, Y and beyond) is surrounded by the coronal suture, by the suture [sutura fronto-ethmoidalis] that bounds the eighth bone [os ethmoidale] of the head where the organs of smell [organum olfactorium] are located, 95 and by the suture [sutura frontozygomatica] that begins from the hollow of the temples, runs [sutura sphenofrontalis] through the middle of the eye sockets to the place where the brows meet [nasion], and separates [sutura frontomaxillaris] the frontal bone from the bones of the upper maxilla [processus frontalis maxillae]. This one has taken the last place in the number of sutures. Thus the frontal bone is somewhat circular, and nowhere thinner than where (at the side of h, L in fig. 6) it constitutes the upper region of the eye sockets and is joined to the eighth bone [os ethmoidale] of the head. Here is it formed as it were of two thin scales with an empty space between filled with air, like the cavity [sinus frontalis] (K in figures 6 and 7) which you will hear it has between its scales [laminae externa et interna] at the brows beginning at the top. This bone is much thicker than elsewhere because of this cavity, and seems to bulge out. One of its scales, which faces the eye socket and is exterior, seems smooth. The one that faces the inside of the head bulges with irregular, cloudlike swellings (figs. 12 and 13 in Bk. 7 show something of the kind) [impressiones gyrorum] which match the convolutions of the brain. In the temples where the temporal muscles are located it is thin, solid, and not at all porous, except at the point (“&” in fig. 6) where it joins the vertex bone [os parietale]. For Nature made each individual bone thicker there toward the inside, lest an excessive thinness of the bones should make the skull too weak at that point. Moreover, the frontal bone shows no noticeable cavity in the forehead a little above the brows and the remaining part which is unfleshed, 96 and it feels much stouter and thicker than the bones of the vertex. Yet at the point where it is joined to them, and the sagittal suture meets the coronal, the os frontis is thinner and weaker than in the forehead itself.



Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 6 On the Eight Bones of the Head and the Sutures Connecting Them