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n. pl. sple·ni·i (-nē-ī′)
Either of two muscles of the back of the neck, extending from the upper vertebrae to the base of the skull, that rotate and extend the head and neck.

[New Latin splēnius, from Latin splēnium, patch, plaster (from its shape), from Greek splēnion, from splēn, spleen.]

sple′ni·al (-nē-əl) adj.
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Detection of group A rotavirus RNA and antigens in serum and cerebrospinal fluid from two children with clinically mild encephalopathy with a reversible splenial lesion.
Several studies have found significant sex differences in length, shape and volume of CC with females having larger relative splenial width.
The dentary is long and low, and its medial surface is concealed by the splenial, which is separated from the dentary by a long, slender coronoid more posteriorly.
The authors concluded that case one showed signs of a splenial syndrome.
5,22,23 Holloway found that splenial portion of the corpus callosum was larger and more bulbous in females than in males.