skin-lab - Integumentary System page 1 of 5 ANAT 11110 Fall...

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Integumentary System page 1 of 5 ANAT 11110 Lab 5 Fall 2011 The Integumentary System The integumentary system is composed of the skin (aka, integument) and the ‘accessory’ organs (i.e., hair, nails, glands, and cutaneous sensory receptors). In this lab, we will be studying the structure of the integumentary system. The skin consists of three layers: the epidermis, the dermis, and the subcutaneous layer. The epidermis is composed of keratinized stratified squamous epithelium. It can be divided into 5 zones, as follows (going from deepest to most superficial): - Stratum Basale : the lowest zone; a single layer of cuboidal or columnar cells anchored to the underlying dermis by a basement membrane - Stratum Spinosum : several layers of cells, which may appear ‘spiny’ under the microscope (the cell nuclei are still rather visible in this layer) - Stratum Granulosum : a few cell layers thick; cells appear speckled, having numerous granules of keratin in them - Stratum Lucidum : a thin clear layer, only present in the palms of the hands and the soles of the feet (where the skin [and particularly the epidermis] is the thickest) - Stratum Corneum : the top-most layer of skin; 20-30 layers of flattened, dead keratinized cells; this layer or parts of it may have pulled away from the underlying part of the epidermis, during slide preparation The dermis lies directly underneath the epidermis. It is made up of connective tissue. It can be divided up into two zones: the papillary layer and the reticular layer, as follows: - Papillary layer : a narrow zone of loose connective tissue directly below the basement membrane of the epidermis; inter-digitates with the epidermis to form ‘papillae’ - Reticular layer : a zone of dense irregular connective tissue below the papillary layer Below the dermis is the subcutaneous layer (aka, hypodermis). The subcutaneous layer is primarily composed of adipose tissue with some loose connective tissue. Station 1:
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This note was uploaded on 01/03/2012 for the course ANAT 11110 taught by Professor Manley-buser during the Fall '11 term at Palmer Chiropractic.

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skin-lab - Integumentary System page 1 of 5 ANAT 11110 Fall...

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