Fig. 3

Photomicrograph of Equus asinus skin. (View A) showing skin appendages in different anatomical regions with H&E stain, (View B) with H&E stain, (View C) with Masson trichrome stain, (Views E and F) showing the orientation of collagen fibers in the third accessory layer (T) parallel to the epidermis cordovan layer (Cd) with H&E stain in (View E), and Masson trichrome stain in (View F). Abbreviations: epidermis (Ep), dermis (DE), arrector pilli muscle (AP), hair follicle (HF), sebaceous gland (SB), sweat gland (SG), papillary dermis (P), reticular dermis (R), hair follicle (HF), myoepithelial cells (red arrowhead), sebaceous gland cells (green arrowhead), multivacuolated cytoplasm (black arrowhead) with central nucleus, and blood vessels (Blvs)