Match the following:
| a. Serosa layer | 1. It is made of loose connective tissues containing nerves, blood and lymph vessels. |
| b. Muscularis layer | 2. It is made up of a thin mesothelium with some connective tissues. |
| c. Sub-mucosal layer | 3. It is made by smooth muscles usually arranged into an inner circular and an outer longitudinal layer. |
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