| BFP | Bundle-forming pili |
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| PAP | Pyelonephritis-associated P-pili |
| TCP | Toxin-coregulated pili |
| folliculus pili | <dermatology> A tube-like opening in the epidermis where the hair shaft develops and into which the sebaceous glands open (13 Nov 1997) |
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| folliculus | 1. <anatomy> Generally a small sac or vesicle. 2. <botany> A kind of fruit formed from a single carpel, that splits to release its seeds. 3. <dermatology> A hair follicle, an invagination of the epidermis into the dermis surrounding the hair root. 4. <gynaecology, physiology> An ovarian follicle, an oocyte surrounded by one or more layers of granulosa cells. As the ovarian follicle develops a cavity forms and it is then termed a Graafian follicle. (12 Nov 1997) |
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| folliculus lymphaticus | Lymphatic follicle, one of the spherical masses of lymphoid cells, frequently having a more lightly staining centre. See: solitary lymphatic follicles, Peyer's patches. Synonym: folliculus lymphaticus, lymph nodule, nodulus lymphaticus. (05 Mar 2000) |
| folliculus ovaricus primarius | An ovarian follicle before the appearance of an antrum; marked by developmental changes in the oocyte and follicular cells so that the latter form one or more layers of cuboidal or columnar cells; the follicle becomes surrounded by a sheath of stroma, the theca. Synonym: folliculus ovaricus primarius. (05 Mar 2000) |
| folliculus ovaricus vesiculosus | A follicle in which the oocyte attains its full size and is surrounded by an extracellular glycoprotein layer (zona pellucida) that separates it from a peripheral layer of follicular cells permeated by one or more fluid-filled antra; the theca of the follicle develops into internal and external layers. Synonym: folliculus ovaricus vesiculosus, graafian follicle, secondary follicle. (05 Mar 2000) |
| arrector pili | A microscopic band of muscle tissue which connects a hair follicle to the dermis. When stimulated, the arrector pili will contract and cause the hair to become more perpendicular to the skin surface (stand on end). (12 Dec 1998) |
| arrector pili muscles | Bundles of smooth muscle fibres, attached to the deep part of the hair follicles, passing outward alongside the sebaceous glands to the papillary layer of the corium; they act to pull the hairs erect, causing "goose bumps" or "goose flesh" (cutis anserina). Synonym: musculi arrectores pilorum, arrectores pilorum, erector muscles of hairs. (05 Mar 2000) |
| bulbus pili | Hair bulb, the lower expanded extremity of the hair follicle that fits like a cap over the papilla pili. Synonym: bulbus pili, hair bulb. (05 Mar 2000) |
| radix pili | The part of a hair that is embedded in the hair follicle, its lower succulent extremity capping the dermal papilla pili in the deep bulbous portion of the follicle. Synonym: radix pili. (05 Mar 2000) |
| papilla pili | A knoblike indentation of the bottom of the hair follicle, upon which the hair bulb fits like a cap; it is derived from the corium and contains vascular loops for the nourishment of the hair root. Synonym: hair papilla. (05 Mar 2000) |
| pili | Thread-like structures present on some bacteria. Pili are shorter thanflagella and are used to adhere bacteria to oneanother during mating and to adhere to animal cells. (09 Oct 1997) |
| pili annulati | A rare condition in which the hair shows alternate pigmented and bright segments, the latter due to air cavities within the cortex. Synonym: leukotrichia annularis, pili annulati, thrix annulata, trichonosus versicolor. (05 Mar 2000) |
| pili, sex | Filamentous or elongated proteinaceous structures which extend from the cell surface in gram-negative bacteria that contain certain types of conjugative plasmid. These pili are the organs associated with genetic transfer and have essential roles in conjugation. Normally, only one or a few pili occur on a given donor cell. this preferred use of "pili" refers to the sexual appendage, to be distinguished from bacterial fimbriae (fimbriae, bacterial), also known as common pili, which are usually concerned with adhesion. (12 Dec 1998) |
| collum folliculi pili | The narrowed part of the hair follicle between the hair bulb and the surface of the skin. Synonym: collum folliculi pili. (05 Mar 2000) |
| cuticula pili | A layer of overlapping shingle-like cells that invest the hair cortex and serve to lock the hair shaft in its follicle. Synonym: cuticle of hair. Cuticula vaginae folliculi pili, cuticle of overlapping shingle-like cells lining the follicle of the hair. Synonym: cuticle of root sheath. (05 Mar 2000) |
| scapus pili | The non-growing portion of a hair which protrudes from the skin, i.e., from the follicle. Synonym: scapus pili. (05 Mar 2000) |
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