arrector pili

arrector pili

(ă-rek′tŏr pī′lī″, pil′ē) (ar″ek′tōr′ēz pī″lōr′ŭm, pil-ōr′) plural.arrectores pilorum [L. arrector, raiser + pilus]
One of the involuntary muscle fibers arising in the skin and extending down to connect with the hair follicles on the side toward which the hair slopes. After certain stimuli, including cold or fright, the muscle fibers contract, straighten the follicles, and raise the hairs, resulting in piloerection.
References in periodicals archive ?
When they are located in the dermis, they are characteristically small and superficial, and they arise from arrector pili muscles (3).
Cutaneous leiomyomas are rare, benign tumours arising from the arrector pili muscle of hair follicles.
Goose bumps is a phenomenon that happens when tiny arrector pili muscles contract to make hair stand on end.
Glycogenosome accumulation in the arrector pili muscle in Pompe disease.
They appear when you are frightened or a bit chilly, thanks to the tiny muscles called arrector pili surrounding the hair follicles in your skin.
The transplanted primordium also forms connections with surrounding tissues (arrector pili muscle and nerves) and repeats normal hair cycles.
However, a few bacilli may get buried alive in the fibrosed nerves and arrector pili muscles, thereby serving as a nidus for relapse.
The experience can activate the cat's arrector pili muscles, which are attached to the hair follicles.
The follicles also developed the correct structures and formed proper connections with surrounding host tissues such as the epidermis, arrector pili muscle and nerve fibers.
Goosebumps happen when the tiny muscles in each hair follicle, called arrector pili muscles, contract, says Dr.
A small muscle, the arrector pili, is attached to the wall of the follicle and to the lower layer of the epidermis.
Each tiny hair on your skin is attached to small muscles, called arrector pili muscles.