The most superficial layer of the skin is the epidermis. Color the five layers of the epidermis. The deepest layer is the stratum basale and there are specific cells called melanocytes that secrete the brown pigment melanin. Color the majority of the stratum basale pink but color the melanocytes brown. Color the stratum spinosum a light blue. The stratum granulosum has purple granules in it so color that layer using purple dots. The stratum lucidum (found only in thick skin) is a thin, light colored layer so yellow or white are good colors for this tissue. Color the superficial stratum corneum orange.
The overview of the skin contains many layers. Color the epidermis a red-orange. The dermis consists of two layers, an upper papillary layer, which should be colored in a light pink, and a deeper reticular layer, which should be colored a darker pink. There are sweat glands that are found in the dermis that can be colored purple. You should color the hypodermis (not a part of the integument) yellow because of the amount of fat found there. Two types of touch receptors can easily be seen in microscopic sections. These are the Meissner corpuscles and the Pacinian corpuscles.
Answer Key: a. Stratum corneum, b. Stratum lucidum, c. Stratum granulosum, d. Stratum spinosum, e. Stratum basale, f. Melanocyte, g. Epidermis, h. Papillary layer, I. Reticular layer, j. Dermis, k. Hypodermis, I- Sweat gland, m. Pacinian corpuscle, n. Meissner corpuscle
Hair consists of several parts. The hair originates from the dermal papilla and the deepest part of the hair is known as the hair bulb. The hair is pushed superficially and forms the hair root (the part of the hair enclosed in the skin). Once the hair erupts from the skin it is known as the hair shaft. Color the three sections of hair different shades of blue. The hair is enclosed by the hair follicle, which should be colored purple.
Associated with the hair are the arrector pili muscle, which is made of smooth muscle and is colored pink, and an oil-secreting gland known as the sebaceous gland, which should be colored yellow.
Fingernails and toenails are considered accessory structures of the integument. Color the diagram labeling the nail plate, the free edge, the nail fold, the lunula, eponychium (cuticle), nail root, hyponychium and the nail bed.
Answer Key: a. Bulb, b. Follicle, c. Root, d. Shaft, e. Sebaceous gland, f. Arrector pili. g. Pacinian corpuscle, h. Nail plate, i. Nail fold, j. Lunula, k. Eponychium, I. Nail root, m. Free edge, n. Hyponychium, o. Nail matrix (Nail bed)
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