The anal columns (of Morgagni) are 6-10 vertical folds of mucosa in the upper half of the anal canal. They contain branches of the rectal vessels and are joined at their lower ends by the anal valves along the pectinate line.
| Location | Upper half of the anal canal, above the pectinate line |
|---|---|
| Parts |
|
| Nerve Supply | Autonomic (visceral) nerves; insensitive to cutting pain |
| Blood Supply | Superior rectal artery; Middle rectal artery |
| Venous drainage |
|
| Lymphatic drainage |
|
Contain the vascular anal cushions that help seal the anal canal.
Internal haemorrhoids develop from the cushions in the anal columns and are usually painless because this area has visceral innervation. This is also a site of connection between portal and systemic veins.
Enlarged anal cushions above the pectinate line causing painless bleeding or prolapse.
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