Esophagus The esophagus is a hollow, muscular tube that connects your neck to your stomach and transports food and drink. Food is propelled down your throat by muscles. Higher magnification of the mucosa shows the stratified squamous epithelium (E), the lamina propria (LP) with scattered lymphocytes, and strands of smooth muscle in the muscularis mucosae (MM).

Tongue Lingual papillae The tongue is a muscular organ in the mouth. Mucosa is a wet, pink tissue that covers the tongue. The rough texture of the tongue is caused by tiny bumps called papillae. Thousands of taste buds cover the papillae's surfaces. Section of the dorsal surface of tongue showing both filiform (FI) and fungiform papillae (F). Both types are elevations of the connective tissue (CT) covered by stratified squamous epithelium (SS), but the filiform type is pointed and heavily keratinized while the fungiform type is mushroom-shaped, lightly keratinized, and has a few taste buds.

Stomach wall The stomach is a muscular organ that aids in the digestion of meals. It's a portion of your gastrointestinal tract (GI). When you eat, your stomach contracts and generates acids and enzymes that help break down the food. A low-magnification micrograph of the stomach wall at the fundus shows the relative thickness of the four major layers: the mucosa (M), the submucosa (SM), the muscularis externa (ME), and the serosa (S). Two rugae (folds) cut transversely and consisting of mucosa and submucosa are included.

Sources: https://my.clevelandclinic.org/health/body/21728-esophagus https://www.webmd.com/oral-health/picture-of-the-tongue#:~:text=Thetongueisamuscular,thesurfacesofthepapillae. https://my.clevelandclinic.org/health/body/21758-stomach#:~:text=ThestomachisaJ,thegastrointestinal(GI)tract. Junqueira’s Basic Histology Text and Atlas