Key

Ad, adipose tissue

GC, goblet cells

N, nuclei of goblet cells

BB, brush border

Gl, glands

SM, submucosa

Bm, basement membrane

IC, inflammatory cells

TC, tracheal cartilage

C, cilia

LN, lymphatic nodule

TM, trachealis muscle

EP, epithelium

LP, lamina propria

V, vein

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