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Animal Hair Descriptive Characteristics

Animal Hair Descriptive Characteristics Animal Hair Types Guard Hairs- longer, thicker, straight and form the outer protective coat of the animal Fur or Wool Hairs- thin, soft, kinked and not straight found close to the skin forming an insulating inner coat Tactile hairs- Provide sensory functions and typically found on the head of animals such as whiskers. Cuticle Scale Pattern Imbricate- scales are in a random overlapping pattern (much like roof tiles) and are often flattened. Spinous- scales have a spiny (long and pointed) appearance that overlap. Coronal- Crown like scale pattern in very fine hairs that looks like a stack of paper cups. (Common on small rodents) and bats, rare in humans) Cortex Color Wide range of natural colors and shadings. Medulla Description Categories Medulla is the inner most layer of hair and serves as the marrow of the hair. It is composed of air filled compartments that are typically harder to see in human hair compared to other animals. Medulla Structures Amorphous Medulla appears as a solid line, but lacks a clear pattern or structure Uniserial Has one ladder row of components running down the hair longitudinally Multiserial Has multiple ladder rows of components running down the hair longitudinally Cellular Is a wide band of randomly shaped cell-like structures. Lattice Can occupy nearly the entire width of the hair with small circle shaped components. Medullary Index Describes the thickness of the medulla layer In humans the value of the medullary index is usually 0.333 or less, and that of animal hair is 0.50 or greater. Medullary Index Calculation Medullary index is calculated by dividing the medullar width by the width of the cortex Link to Lecture Slides: https://drive.google.com/file/d/1hAG1... *Due to the description character limit the full work cited for "Animal Hair Descriptive Characteristics" can be viewed at... https://drive.google.com/file/d/10y7g...