The specimen didn't include adjacent normal skin or deep muscle tissue, but it is thought to have arisen from the arrector
pili muscles considering its location (below the dermis and above the muscle).
The mechanism of pain is poorly understood, but it may be related to neuropeptide release, pressure on nerve fibres within lesions or contraction of the arrector
pili muscle.5 The diagnosis may be accomplished histopathology of the papule or nodule.
People with androgenic alopecia lack arrector
pili muscles in their scalp.
These newly formed follicles lack associated arrector
pili muscles and sweat glands but possess large multi-lobed sebaceous glands (Li, 2010).
The BrdU labeling index in AAE groups was significantly higher than in vehicle control, especially in the hair matrix (Figures 2(a)-2(f), open arrows) and the outer root sheath (Figures 2(a)-2(f), diamond arrows), which contained a subpopulation of outer root sheath cells located in the middle portion of a follicle at the arrector
pili muscle attachment site (the niche shown in Figure 2(h)).
The experience can activate the cat's arrector
pili muscles, which are attached to the hair follicles.
The hair follicle is divided into three segments, infundibulum extending from the surface opening of the follicle to the level of level of the opening of its sebaceous gland, it is part of the pilosebaceous canal that is used as a route for the discharge of sebum; isthimus extending from the infundibulum to the level of insertion of arrector
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.
each follicle is associated with a holocrine sebaceous gland, and apocrine sweat gland and an arrector
pilli muscle with no discernible follicle group but in sheep of present study both primary and secondary follicles were present in discernable follicle groups.
A high concentration of Merkel cells in the bulge prior to the attachment of the arrector
pili muscle and the formation of the perifollicular nerve plexus in human fetal skin.
Goosebumps happen when the tiny muscles in each hair follicle, called arrector
pili muscles, contract, says Dr.