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28-Feb-2020 10:36

The English word snake comes from Old English snaca, itself from Proto-Germanic *snak-an- (cf.

Legless lizards resemble snakes, but several common groups of legless lizards have eyelids and external ears, which snakes lack, although this rule is not universal (see Amphisbaenia, Dibamidae, and Pygopodidae).Early in snake evolution, the Hox gene expression in the axial skeleton responsible for the development of the thorax became dominant.As a result, the vertebrae anterior to the hindlimb buds (when present) all have the same thoracic-like identity (except from the atlas, axis, and 1–3 neck vertebrae).In other words, most of a snake's skeleton is an extremely extended thorax.Ribs are found exclusively on the thoracic vertebrae.

Legless lizards resemble snakes, but several common groups of legless lizards have eyelids and external ears, which snakes lack, although this rule is not universal (see Amphisbaenia, Dibamidae, and Pygopodidae).Early in snake evolution, the Hox gene expression in the axial skeleton responsible for the development of the thorax became dominant.As a result, the vertebrae anterior to the hindlimb buds (when present) all have the same thoracic-like identity (except from the atlas, axis, and 1–3 neck vertebrae).In other words, most of a snake's skeleton is an extremely extended thorax.Ribs are found exclusively on the thoracic vertebrae.Some possess venom potent enough to cause painful injury or death to humans.