Characteristics of Hair

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Presentation transcript:

Characteristics of Hair

Investigate You will be using your knowledge of hair to distinguish among different species of animals Use what you learn in this PowerPoint to help you know what to look for in each specimen to find similarities and differences.

Anatomy of a Hair

Follicle Hair is an appendage of the skin that grows out of a hair follicle.

Hair Roots Pulled Forcibly Removed Shed

Structure of the Hair Cortex Cuticle Medulla

Cuticle The cuticle is the outside covering of the hair. It is formed by overlapping scales that always point toward the tip of the hair.

These scales are formed from special cells that are hardened and flattened while progressing from the follicle.

Close up of cuticle Which way is the end of the shaft? Each cuticle pattern is unique for each individual animal and for each specie.

Cortex the interior of the hair embedded with pigment granules that impart color to hair composed of spindle-shaped cortical cells aligned in a regular array, parallel to the length of the hair

Cortex the interior of the hair embedded with pigment granules that impart color to hair composed of spindle-shaped cortical cells aligned in a regular array, parallel to the length of the hair

Pigment granules are absent in grey hairs

Medulla a collection of cells which appear as a canal running though the center of the hair the medulla is the most predominant hair feature in many species The medulla may be absent in blond hair

Medulla:

Types of Medulla Continuous-Interrupted-Fragmented . Serial medulla is the term used to a describe multiple medulla within a single hair

Examination of the Medulla

Type of Medulla?

Human Hairs Racial Determination Negroid Mongoloid Caucasian