Splenial

The splenial is a small bone in the lower jaw of reptiles, amphibians and birds, usually located on the lingual side (closest to the tongue) between the angular and surangular.[1][2]

Hemimandible of Trimerorhachis; the splenial (labeled "sp") is visible on the interior surface

References

Romer, A. S. (1956). Osteology of the Reptiles. 772 pp. Chicago & London.
Watson, D. M. S. (1912). LXVII.—On some reptilian lower jaws. Journal of Natural History, 10(60), 573-587.

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[1] Romer, A. S. (1956). Osteology of the Reptiles. 772 pp. Chicago & London.

[2] Watson, D. M. S. (1912). LXVII.—On some reptilian lower jaws. Journal of Natural History, 10(60), 573-587.