The Compendium of Bheḷa 4.7.4

4.7.4

pañcadaśakoṣṭhāṅgāni[koṣṭhāni] | tad yathā---nābhiś ca hṛdayaṃ ca kloma ca yakṛc ca plīhā ca vṛkkau ca vastiś ca purīṣādhānaṃ cāmāśayaścottaragudaś cādharagudaś ca kṣudrāntraṃ ca sthūlāntraṃ ca vapāvahanaṃ ceti ||

There are fifteen visceral organs, as follows: the umbilicus, the heart, the kloman, the liver, the spleen, the two kidneys, the urinary bladder, the receptacle of feces, the stomach, the upper rectum, the lower rectum, the small intestine, the large intestine, and the omentum.