The granules contain a lipid rich secretion, which acts as a water sealant. Thick skin has a numerous, spirally-coiled sweat glands while thin skin has fewer sweat glands. Most of the skin can be classified as thin skin. It occurs between the outermost layer of the epidermis, called the stratum corneum and a lower layer, called the stratum granulosum. Another difference between thick and thin skin is that the former contains regular dermal papillae while the latter contains irregular dermal papillae. Stratum basale: This bottom layer, which is also known as the basal cell layer, has column-shaped basal cells that divide and push older cells toward the surface of the skin.As the cells move up through the skin, they flatten and eventually die and shed. The stratum lucidum is a smooth, seemingly translucent layer of the epidermis located just above the stratum granulosum and below the stratum corneum. They are named as stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum. The topmost layer, the stratum corneum, consists of dead cells that shed periodically and is progressively replaced by cells formed from the basal layer. A callus is cause by: increased layers in the stratum corneum 46. Other changes in the appearance of skin coloration can be indicative of diseases associated with other body systems. The keratinocytes that compose the stratum lucidum … The defect is primarily due to the inability of melanocytes to produce melanin. Eumelanin exists as black and brown, whereas pheomelanin provides a red color. Stratum spinosum: This layer, which is also known as the squamous cell layer, is the thickest layer of the epidermis. Keratin is an intracellular fibrous protein that gives hair, nails, and skin their hardness, strength, and water-resistant properties. Stratum Lucidum. It is a thin transparent layer, difficult to recognise in routine histological sections. Liver disease or liver cancer can cause the accumulation of bile and the yellow pigment bilirubin, leading to the skin appearing yellow or jaundiced (jaune is the French word for “yellow”). Epidermis - 5 Layers of Epidermis, Outermost Layer & Function The Nervous System and Nervous Tissue, 12.1 Structure and Function of the Nervous System, Chapter 13. Freebase (0.00 / 0 votes) Rate this definition: These two proteins make up the bulk of the keratinocyte mass in the stratum granulosum and give the layer its grainy appearance. What are the Similarities Between Thick and Thin Skin     – Outline of Common Features4. Melanosomes are temporary structures that are eventually destroyed by fusion with lysosomes; this fact, along with melanin-filled keratinocytes in the stratum corneum sloughing off, makes tanning impermanent. They are classified based on the thickness of the epidermis. E. Stratum Corneum. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs. Stratum corneum Two other cell types are found dispersed among the basal cells in the stratum basale. What is the reticular layer of the dermis made out of? The second is a melanocyte, a cell that produces the pigment melanin. The Cardiovascular System: The Heart, 19.2 Cardiac Muscle and Electrical Activity, Chapter 20. The dermis layer under thick skin tends to be thinner than that underlying typical thin skin; as a result, thin skin is easier to suture than thick skin. Individuals with albinism tend to need more protection from UV radiation, as they are more prone to sunburns and skin cancer. An Introduction to the Human Body, 1.2 Structural Organization of the Human Body, Chapter 2. The hypodermis, deep to the dermis of skin, is the connective tissue that connects the dermis to underlying structures; it also harbors adipose tissue for fat storage and protection. Stratum Lucidum. The stratum lucidum is a smooth, seemingly translucent layer of the epidermis located just above the stratum granulosum and below the stratum corneum. The more superficial papillary layer serves as an anchor point for the epidermis above and is intimately connected to the deeper reticular layer. Although you may not typically think of the skin as an organ, it is in fact made of tissues that work together as a single structure to perform unique and critical functions. Too much sun exposure can eventually lead to wrinkling due to the destruction of the cellular structure of the skin, and in severe cases, can cause sufficient DNA damage to result in skin cancer. The cells (three to five layers deep) become flatter, their cell membranes thicken, and they generate large amounts of the proteins keratin, which is fibrous, and keratohyalin, which accumulates as lamellar granules within the cells (see Figure 5.1.4). Fingerprints are unique to each individual and are used for forensic analyses because the patterns do not change with the growth and aging processes. Stratum Lucidum. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from the deeper layers (Figure 5.1.3). Collagen fibers provide structure and tensile strength, with strands of collagen extending into both the papillary layer and the hypodermis.