IPA: /sʌbˈmjuːkəʊsə/
KK: /sʌbˈmjuːkəsə/
A layer of tissue that is located beneath a mucous membrane, providing support and structure.
The doctor explained that the submucosa contains blood vessels and nerves that help the mucous membrane function properly.
Submucosa → It is formed from "sub-" (meaning under) and "mucosa" (from Latin "mucosa", meaning mucous membrane). The term refers to the layer of tissue that lies beneath the mucous membrane.
Think of something that is 'under' ('sub-') the 'mucous membrane' ('mucosa') — that's what submucosa refers to.