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Trichotillomania (TTM), also known as hair-pulling disorder or compulsive hair pulling, is a mental disorder characterized by a long-term urge that results in the pulling out of one's own hair. [ 2 ] [ 4 ] A brief positive feeling may occur as hair is removed. [ 5 ]
The inner root sheath (IRS) consists of: a delicate cuticle next the hair, composed of a single layer of imbricated scales with atrophied nuclei; Huxley's layer; Henle's layer; The term "trichilemmal" refers to the outer root sheath. [2] The IRS functions to mould, adhere, as well as participate in the keratinization of growing hair. [3]
"During this phase, hair growth stops, and the outer root sheath shrinks and attaches to the root of the hair," says Dr. Kinler. "This detachment is a natural process as the hair prepares to enter ...
Once the hair has been pulled out, persons with trichophagia might rub the hair against their lips, roll the hairs around and inspect them, bite off and swallow the bulb of the hair, or ingest the entire hair shaft as well. [9] Typically, ingested hair remains asymptomatic and is not harmful.
A hair pulled out in this phase will typically have the root sheath attached to it which appears as a clear gel coating the first few mm of the hair from its base; this may be misidentified as the follicle, the root or the sebaceous gland by non-health care professionals. Scalp hair stays in this active phase of growth for 2–7 years; this ...
Trichilemmal cysts are derived from the outer root sheath of the hair follicle. Their origin is currently unknown, but they may be produced by budding from the external root sheath as a genetically determined structural aberration. They arise preferentially in areas of high hair follicle concentrations, so 90% of cases occur on the scalp.
Huxley's layer is the second layer of the inner root sheath of the hair and consists of one or two layers of horny, flattened, nucleated cells. It lies between Henle's layer and the cuticle . [ 1 ]
The hair shaft has been reported as thin for some cases and normally structured for other loose anagen syndrome reports. [12] The inner root sheath of normal anagen hairs usually do not have keratin in the Huxley cells, Henle cells and inner root sheath. They are usually organised in an orderly manner and densely compacted.