The Hippocratic treatise 'On Anatomy'.

On Anatomy ‘is the shortest treatise preserved in the Hippocratic Corpus. It consists of a mere thirty-two lines. The treatise describes the human anatomy as perceived by the Hippocratic doctors, a perception reached probably by observing sacrificial animals, wounded or dead soldiers and, possibly, ‘[an] aborted foetus or exposed child’. The syntax of the work is described as ‘bald, telegraphic, and asyndetic, the vocabulary is recondite, and poetic. There is erratic omission of the article and recurrent use of compendious comparisons’
The spleen is situated principally in the left hypochondriac region of the abdomen lies between the fundus of the stomach and the diaphragm and pleura, and from the ninth, tenth, and eleventh ribs. And is of an oblong flattened form.