Splenial

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

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]

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.

Bones in the tetrapod skeleton

Composite bones	Interparietal (Postparietal+Tabular)

Braincase

Composite bones	Occipital (Supraoccipital+Exoccipital+Basioccipital) Otoccipital (Exoccipital+Opisthotic) Parabasisphenoid (Parasphenoid+Basisphenoid) Petrosal (Prootic+Opisthotic) Temporal (Squamosal+Petrosal+Ectotympanic)

Palate

Postcranial skeleton

Vertebrae	Atlas Axis Cervical vertebrae Dorsal vertebrae Sacrum Caudal vertebrae Coccyx Pygostyle Haemal arches
Ribs	Cervical ribs Dorsal ribs Caudal ribs

Pectoral girdle

Distal carpals	Distal carpal 1 (Trapezium) Distal carpal 2 (Trapezoid) Distal carpal 3 (Capitate) Distal carpal 4 (Hamate) Distal carpal 5

Proximal tarsals	Tibiale Intermedium Fibulare (Calcaneum)
Centralia	Centrale 1 Centrale 2 Centrale 3 Centrale 4
Distal tarsals	Distal tarsal 1 (Medial cuneiform) Distal tarsal 2 (Intermediate cuneiform) Distal tarsal 3 (Lateral cuneiform) Distal tarsal 4 Distal tarsal 5
Composite tarsals	Astragalus (Talus) (Tibiale+Intermedium+Centrale 3+4) Navicular (Centrale 1+2) Cuboid (Distal tarsal 4+5)

Miscellaneous

Parentheses denote bones that receive a different name in particular clades
Italics denote neomorphic bones present only in particular clades

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Retrieved from "https://mdwiki.org/wiki/Splenial"