Chapter 10 Flashcards
The scale structure covering the exterior of the hair
Cuticle
The main body of the hair shaft
Cortex
A cellular column running through the center of the hair
Medulla
Resembles paper cups
Coronal cuticle
Resembles petals and protrude from the shaft
Spinous cuticle
Flattened, overlapping scales
Imbricate cuticle
Measures the diameter of the medulla relative to the diameter of the hair shaft and is normally expressed as a fraction
Medullary index
The initial growth phase during which the hair follicle actively produces hair
Anagen phase
A transition stage between the anagen and telogen phases of hair growth
Catagen phase
The final growth phase in which hair naturally falls out of the skin
Telogen phase
A translucent piece of tissue surrounding the hair’s shaft near the root; contains the richest source of DNA associated with hair
Follicular tag
DNA present within the nucleus of a cell; this form of DNA is inherited from both parents
Nuclear DNA
DNA present in small structures (mitochondria) outside the nucleus of a cell; this form of DNA is inherited maternally
Mitochondrial DNA
A phenomenon consistent with hair from a deceased individual’s head
Root banding
Fibers derived entirely from animal or plant sources
Natural fibers
Fibers derived from either natural or synthetic polymers; the fibers are typically made by forcing the polymeric material through the holes of a spinneret
Manufactured fibers
Two or more atoms held together by chemical bonds
Molecule
A molecule with a high molecular mass
Macromolecule
The basic unit of structure from which a polymer is constructed
Monomer
A substance composed of a large number of atoms arranged in monomers
Polymer
Fibers manufactured from natural raw materials
Regenerated fibers
Fibers manufactured solely from synthetic chemicals
Synthetic fibers
