might be a ligament or a vertebra—though more probably the latter. But it might be a combination of several pieces.
is the occiput, and this suggests the hypothesis of cervical vertebrae. But the number of these is not four but seven. Of these three are peculiar; the Atlas which supports the head, the Axis upon which the head turns, and the Vertebra prominens with its long spinal process. But see the Vignette of chapter 42 from Pd where four vertebrae are figured.
[2.] Symbols, or symbolical representations,
