Coluddyn dall

Mae'r coluddyn dall (Lladin: caecus sef 'dall; Sa: Caecum) yn rhan o'r perfedd, neu i fod yn fanwl gywir (o ran anatomeg ddynol) - y colon mawr ac felly'n rhan

Coluddyn dall

1: Y geg
2: Taflod
3: Tafod bach
4: Tafod
5: Dannedd
6: Chwarennau poer
7: Isdafodol
8: Isfandiblaidd
9: Parotid
10: Argeg (ffaryncs)
11: Sefnig (esoffagws)
12: Iau (Afu)
13: Coden fustl
14: Prif ddwythell y bustl
15: Stumog
 16: Cefndedyn (pancreas)
17: Dwythell bancreatig
18: Coluddyn bach
19: Dwodenwm
20: Coluddyn gwag (jejwnwm)
21: Glasgoluddyn (ilëwm)
22: Coluddyn crog
23: Coluddyn mawr
24: Colon trawslin
25: Colon esgynnol
26: Coluddyn dall (caecwm)
27: Colon disgynnol
28: Colon crwm
29: Rhefr: rectwm
30: Rhefr: anws

Mae'r coluddyn dall (Lladin: caecus sef 'dall; Sa: Caecum) yn rhan o'r perfedd, neu i fod yn fanwl gywir (o ran anatomeg ddynol) - y colon mawr ac felly'n rhan o'r system dreulio. Mae'n debyg o ran ffurf i goden fechan ac mae'n cysylltu'r iliwm gyda'r colon. Dyma, mewn gwirionedd, gychwyn y colon mawr. Caiff ei wahanu o'r iliwm gan y falf ileocecal (ICV) (neu falf Bauhin) a chaiff ei wahanu oddi wrth y colon, ar yr ochr arall, gan y cecocolic junction.

Amrywiaeth

Mae gan y mamaliaid a'r sgwid goluddyn dall ac mae gan adar ddau. Mae gan y rhan fwyaf o lysysyddion (Sa: herbivores) goluddyn dall cymharol fawr, a hwnnw'n llawn o facteria sy'n cynorthwyo i ddadelfennu neu dreulio'r seliwlos a geir mewn celloedd planhigion.

Mae gan gigysyddion (carnivores), ar y llaw arall, goluddyn dall llai na'r arfer, gyda chwlwm y coledd yn ei le.

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