System dreulio: Gwahaniaeth rhwng fersiynau

[[Delwedd:Gastrointestinal tract dim iaith.jpg|bawd|de|300px|1: [[stumog|Yy stumog]], 2: [[coluddyn mawr|Yy colon]], 3: [[Coluddyncoluddyn bach]], 4: [[rectwm]], 5: [[anws]], 6: [[cwlwm y coledd]], 7: [[y coluddyn dall]] (caecwm)]]