Manasara 57.22

57.22

sārdhadaśāṃśaṃ tasmātsamaṃ nābhikarāntakam
madhyodaraṃ ca etasmānmeḍhrāṃśaṃ tu tatsamam

ten and a half parts thence, and equal down to the tip of the navel; / and the middle of the abdomen from this to the penis is equal to that part;