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 eighth bone of the head

The eighth bone of the head (A, B, A in fig. 8; along h, L, Y in fig. 6) [lamina cribrosa ossis ethmoidalis], contained in the base of the frontal bone, is surrounded by that suture [sutura fronto-ethmoidalis] which separates it from the frontal bone and the cuneiform bone, as well as by that (g in fig. 1, ch. 9) which we have previously said runs in the lower part [vomer] of the nasal septum and separates this bone from those of the upper maxilla. Besides the nasal septum [lamina perpendicularis] 115 produced out of it, this bone is the seat of the organs of smell (C, D, E in figure 12, Book 7) and is pierced by many small foramina [foramina cribrosa] for the sake of smells, 116 yet upon inspection it looks thin and solid in substance. 117 It puts forth a long process [crista galli] (h in figure 6) into the skull cavity, dividing like a septum the places where the organs of smell are located. Indeed, to this process 118 is very tightly attached that part (H in fig. 12, Bk. 7) [falx cerebri] of the hard membrane [dura mater cranialis] of the brain which divides the brain’s right part from the left.



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