Abstract
The current study was designed to give microscopic view on the snout skin of the domestic pig (Sus scrofa domesticus) to clear its adaptations with the function of exploring for the food and pushing the objects. This study carried out on the snout skin of apparently healthy 1 year five pigs (Sus Scrofa) and examined under the light and transmission electron microscopy. Our results clarify that the snout skin cutis composed of the epidermis and the dermis. The epidermis consisted of stratum corneum, stratum granulosum, stratum spinosum, and stratum basale. The stratum corneum and the stratum spinosum appeared thicker than other parts. The dermis consisted of a reticular and a papillary dermis. For tightness junction between the dermis and the epidermis, the hemidesmosomes were observed, while the desmosomes were presented in abundant numbers at the level of stratum basale to ensure the adhesion between the keratinocytes. The merocrine sweat glands were observed in abundant numbers to provide the wetness of the snout to avoid its injury from friction during food exploring or pushing of the objects. We concluded that the adaptation of the snout skin with the environmental condition surrounding the studied domestic pig.
Micrographs showing the histological structure of the epidermis (View a) and the dermis (Views b–d) of the domestic pig (Sus scrofa domesticus) to clarify; BV, blood vessels; CF, collagen fibers; HF, hair follicle; DP, dermal papillae; LG, Langerhans cells; M, melanocytes; NA, nerve axons; PD, papillary dermis; RD, reticular dermis; RR, rete ridges; SB, stratum basale; SBG, sebaceous glands; SC, stratum corneum; SG, stratum granulosum; SS, stratum spinosum; and SWG, secretory portion of the merocrine sweat glands. H&E. Views a–c (×100) and View d (×200). The epidermis consisted of stratum corneum, stratum granulosum, stratum spinosum, and stratum basale. The stratum corneum and the stratum spinosum appeared thicker than other parts. The dermis consisted of a reticular and papillary dermis. For tightness junction between the dermis and the epidermis, the hemidesmosomes were observed, while the desmosomes were presented in abundant numbers at the level of stratum basale to ensure the adhesion between the keratinocytes.