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This study describes the anatomy of arrector pili muscles in scalp hair follicular units, proposing a model where a single muscle structure is shared by all follicles within a unit.

This study revealed that in androgenic alopecia, the proximal attachment of the arrector pili muscle to the hair follicle is often lost or significantly reduced.

This study describes how arrector pili muscles form a single muscular structure shared by all hair follicles within a follicular unit at the isthmus level in scalp skin.

This study found that mechlorethamine restored hair growth in mice with alopecia-areata-like disease by eliminating infiltrated lymphocytes and inhibiting certain pro-inflammatory cytokines in treated skin areas.

This study reports that transplanted mouse hair follicles restored piloerection ability and connected properly with host tissues, suggesting potential for advanced hair restoration therapies.

This study found that hair regrowth in Pomeranians with hair cycle arrest treated with melatonin was not associated with a change in oestrogen receptor-α staining.

This study found that women with androgenetic alopecia experience diffuse hair loss due to a decrease in terminal hairs and an increase in vellus hairs per follicular unit.

This review summarizes the anatomy and physiology of the arrector pili muscle and discusses its potential role in hair loss disorders, reporting no new clinical results.

This study demonstrated that bioengineered hair follicles reconstituted from embryonic skin cells and transplanted into hosts can restore physiological hair functions, suggesting potential applications for treating alopecia.

This study found that scalp cooling resulted in visible hair retention in 53% of breast cancer patients undergoing Epirubicin/Cyclophosphamide and Paclitaxel treatment, with factors like hair bulb diameter, shaft diameter, and anagen rate significantly predicting outcomes.

This review discusses the role of anti-Müllerian hormone in polycystic ovary syndrome and its male equivalent, but reports no new clinical findings; it suggests further investigation is needed into male relatives' reproductive function.

This study found that anti-mullerian hormone levels are significantly elevated in infertile women with polycystic ovarian syndrome compared to those with regular cycles, suggesting it as a potential marker for diagnosing PCOS-related infertility.

In this study, researchers found that bulge cells in mouse hair follicles undergo transient proliferation during early anagen, indicating their role as follicular stem cells. However, another factor beyond dermal papilla proximity may be required to initiate a new anagen phase.

This study found that in Pomeranian dogs with alopecia X, dermoscopic evaluations can supplement diagnoses, and transverse skin biopsy sections better assess hair follicle density and identify growth arrest phases compared to longitudinal sections.

Elevated luteinizing hormone contributes to female-pattern hair loss, and blocking certain channels may help prevent it.

This article discusses the phases and histological features of alopecia areata and reports no new clinical findings; the authors emphasize recognizing these phases for accurate diagnosis.

This review discusses the complex correlation between cellular senescence and PCOS, emphasizing senescence markers, mechanisms, and potential anti-senescence therapies, but reports no new clinical results.

This study developed a testosterone propionate-induced C57BL/6 mouse model of androgenetic alopecia, demonstrating that high-dose, prolonged testosterone administration inhibited hair regrowth and mirrored human AGA pathology, providing a useful platform for studying hair loss mechanisms and testing therapies targeting the Wnt/β-catenin pathway.

Androgenetic alopecia may be irreversible due to the detachment of a muscle from hair follicles.

The study found that balding scalps have more thin hairs and larger oil glands, which might contribute to skin conditions related to hair loss.

This case study reports a 20-year-old laborer's progressive hair loss with scalp and body lesions, diagnosed as lichen planopilaris, leading to scarring alopecia resembling male-pattern baldness.

The document explains how hair follicles develop, their structure, and how they grow.

In this study, researchers observed significant morphological and histological differences in transplanted hair follicles compared to native donor follicles post-FUE hair transplantation for androgenetic alopecia, highlighting substantial variations in sebaceous gland and root sheath degeneration at the recipient site.

This study reported that etretinate treatment leads to increased hair shedding due to a sustained decrease in anagen duration, with an arrest at the onset of anagen and a follicular anchorage defect in telogen contributing to alopecia.

This study found that a stochastic follicular automaton model replicates hair follicle cycle fluctuations, with deterministic simulations aligning with steady-state levels as follicle numbers increase.

This study found that acute stress in rats inhibits hair growth, likely through increased cortisol levels and activation of the substance P-mast cell pathway.

In this study, the researchers reported that early diagnosis and treatment of fibrosing alopecia in a pattern distribution may arrest or potentially reverse disease progression, though some patients experienced continued hair loss.

In this study, researchers established a mouse model for single follicular unit transplantation and reported successful integration and piloerection of transplanted hair follicles with surrounding host tissues.

This case report describes the histopathological features of nevus psiloliparus in an 11-year-old girl, noting "shadow" follicular units with loosely arranged collagen and reduced elastic fibers.

This study suggests that early initiation of treatment in fibrosing alopecia in a pattern distribution may lead to a more favorable outcome, as evident in some patients experiencing arrested disease progression and hair regrowth.