Question

Which among the following is the innermost layer of the Gastrointestinal tract?
1. Serosa
2. Muscularis
3. Sub-mucosa
4. Mucosa

Answer 1

Correct Answer - Option 4 : Mucosa

The correct answer is Mucosa.

• The Gastrointestinal tract is composed of four layers and each layer has different tissues and functions.

• These four layers are serosa, muscularis, sub-mucosa and mucosa.
• The serosa is the outermost layer of the GI tract and is composed of a thin mesothelium with some connective tissues.
• Muscularis is formed by smooth muscles that are usually arranged into an inner circular and an outer longitudinal layer.
• The submucosal layer is composed of loose connective tissues and contains nerves, blood, and lymph vessels.
• The mucosa is the innermost layer which is composed of epithelium cells and thin connective tissue.
• It helps in absorption and secretion.