Jejunum of small intestines
Total Mag: 40x
L= lumen
VL= villi
mL= longitudinal layer of muscularis externa
mc= cicular layer of muscularis externa
BG=Brunner's glands
SA= serosa
Histo-Tips: When trying to differentiate between veins and arteries, look for clearly defined layers (usually arteries) or the size of the lumen (usually collapsed in veins).