Search Results for: infundibulum

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A Clinical Atlas of 101 Common Skin Diseases

Acne Vulgaris

A disease of pilosebaceous units, especially infundibula, that may manifest itself as noninflammatory lesions, i.e., comedones and intact cysts, or as inflammatory lesions, i.e., papules, nodules, and pustules. The process may resolve without…

Histologic Diagnosis of Inflammatory Skin Diseases

Hair Follicles

…viable epithelium beneath it. Therefore, the outer sheath extends all the way from the bottom of the bulb to the base of the infundibulum. The infundibulum, being epidermis, is continuous with surface epidermis. Soon after a follicle enters the…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…olliculitis” is a fiction. 10.37.16A: Pustular dermatitis, infundibular + 10.37.16B: Neutrophils in large number in an infundibulum that houses corneocytes arranged compactly and also outside the infundibulum in the reticular dermis +…

Histologic Diagnosis of Inflammatory Skin Diseases

"Folliculitis" (Infundibulitis)

…a consequence of emergence of neutrophils from capillaries in the peri-infundibular dermis, passage through the wall of the infundibulum, and entry into the infundibular canal. When the number of neutrophils in an infundibulum becomes great…

Histologic Diagnosis of Inflammatory Skin Diseases

Sebaceous Units

…us gland marks the site where lipid-producing glandular cells of sebaceous lobules meet stratified squamous epithelium of an infundibulum. A sebaceous duct is lined by a thin cornifying squamous epithelium with a barely detectable granular zone that…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…follicles of which are in catagen or in telogen + 11.22.7B: Trichomalacia (clumps of melanin in a pleated hair shaft) in an infundibulum = Trichotillomania Often, signs of trichomalacia are present in only a single distorted hair shaft that reposes…

Histologic Diagnosis of Inflammatory Skin Diseases

Embryologic Development

…es an apocrine gland and the straight part above it becomes an apocrine duct whose lumen enters the upper part of the future infundibulum, just above the entrance of a sebaceous duct and on the side opposite it, the sebaceous duct entering the base…

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