guard hair


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Related to guard hair: pelage

guard hair

n.
Any of the long coarse hairs forming a layer that covers and protects the soft underfur of certain mammals.

hair

1. a threadlike keratinized epidermal structure developing from a follicle sunk in the dermis, produced only by mammals and characteristic of that group of animals. Also, the aggregate of such hairs.
2. various other threadlike structures.

auditory h's
hairlike attachments of the epithelial cells of the inner ear.
awn hair
in cats, a short thick, bristly hair underneath the top coat.
hair beds
coat hairs occur in groups of about three primary follicles and a variable number of secondary follicles.
burrowing hair
one that grows horizontally in the skin.
hair cells
sensory neuroepithelial cells which have hair-like processes; found in organ of Corti, ampullary crests and utricle and saccule of the inner ear.
club hair
a hair whose root is surrounded by a bulbous enlargement composed of keratinized cells, preliminary to normal loss of the hair from the follicle.
hair coat
see coat (1).
cover hair
see guard hair (below).
hair follicle
one of the tubular invaginations of the epidermis enclosing the hair roots and from which the hairs grow.
Enlarge picture
Longitudinal section of hair follicle. By permission from Smith BP, Large Animal Internal Medicine, Mosby, 2001
hair follicle unit
hair granuloma
granuloma in the esophageal wall caused by swallowed hairs acting as foreign bodies.
hair growth cycle
a period of growth, called anagen, is followed by a transitional stage, called catagen, and then a period of inactivity in the hair follicle, called telogen, lasting until the cycle starts again. The duration of each stage varies with the species, anatomical location, genetic influence, and a variety of environmental and physiological factors.
guard hair
the coarse, stiff and often longer and more prominent hairs in a haircoat with an undercoat. For example, the darkly colored, outer hairs of a German shepherd dog. Called also primary hair, master hair, cover hair.
ingrown hair
one that has curved and re-entered the skin.
lanugo hair
the fine hair on the body of the fetus.
master hair
see guard hair (above).
primary hair
see guard hair (above).
ringed hair
see thrix annulata.
secondary hair
finer and growing from a more superficial follicle than a guard hair; forms the undercoat.
sensory h's
hairlike projections on the surface of sensory epithelial cells.
sinus hair
the vibrissae or whiskers located on the muzzle and face of many species has an endothelium-lined blood sinus between the inner and outer layers of the dermal portion of the follicle with a rich nerve supply. This structure serves to increase sensory perception.
specialized hair
includes auditory, guard, sensory, tactile, taste, tylotrich hairs (see this list).
hair streams
the hairs in the coat of animals are inclined in one or other direction so that collectively they create streams that meet at vortices or cowlicks.
tactile h's
hairs particularly sensitive to touch.
taste h's
short hairlike processes projecting freely into the lumen of the pit of a taste bud from the peripheral ends of the taste cells.
tipped hair
one with a different, usually darker, color at the tip; seen in Chinchilla cats.
tylotrich hair
special hairs that act as rapid-adapting mechanoreceptors; large, primary follicles with a ring of neurovascular tissue around them. Always associated with a tylotrich pad, a local area of epidermal thickening with a layer of highly vascular and well-innervated connective tissue below.
References in periodicals archive ?
Other factors that likely reduced the number of samples and amount of hair obtained during summer were availability of alternate foods and decreased effectiveness of barbed wire to snag and hold guard hairs from summer pelage.
He believes he's found a better natural fiber for quill bodies: porcupine guard hairs.
A North American porcupine has quills, guard hair and fur on their body.
Human hair is not so differentiated and might be described as a modified combination of the characteristics of guard hairs and fur hairs.
nigra by the following pelage characteristics: 1, no or few creamy-white guard hairs on the back, compared with creamy-white guard hairs on the waist and buttock areas, but those of P.
These guard hairs are clear but, thanks to the optical trick of refraction, these hairs appear white.
The guard hairs usually determine the color of a cat and provide a barrier of protection from water, ultraviolet light and trauma.
When a dancer wants to accentuate his movement, it is the long, responsive, porcupine guard hairs of his roach (plus his crest feather) that project this rhythm beyond his body.
The outer guard hairs of a polar bear's fur are actually clear and hollow, like glass fibers.
Although I haven't gotten to the point where I have the time to learn to spin myself, I have sent out samples of her fiber to some friends who do work with fiber and they have told me that Giselle's fiber is not only about as soft as an alpaca's but it also has either no guard hairs or they are so soft that they just spin right into that soft downy undercoat hair that makes up her mohair.
Preserved in the fossil is a clear halo of guard hairs and underfur residue, making Megaconus only the second known pre-mammalian fossil with fur.