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. 2009 Nov 19;9:62. doi: 10.1673/031.009.6201

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© 2009

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 8. — Internal features visible in a stained section of Scytodes thoracica's right chelicera (same orientation as in Figure 7). The following are worth noting: (1) the muscles are those that move the fang and that may be responsible for some of the elasticity involved in the high-frequency oscillation of the fang during spitting (see discussion); (2) the venom duct is broad throughout its length in the chelicera, only narrowing, abruptly, just proximal to the opening on the fang; and (3) the sac, somewhat bellows-like, may facilitate rapid fang oscillation, because of its flexibility, while allowing the venom duct to remain expanded as far as the base of the fang.