root sheath — noun 1. a. : a many layered epidermal sheath surrounding an aerial root (as the velamen in an epiphytic orchid) b. : coleorhiza 2. : the epidermal lining of a hair follicle comprising two principal layers of cells that make up an inner and an… … Useful english dictionary
Root sheath — Infobox Anatomy Name = PAGENAME Latin = GraySubject = 234 GrayPage = 1068 Caption = Transverse section of hair follicle. Caption2 = Precursor = System = Artery = Vein = Nerve = Lymph = MeshName = MeshNumber = DorlandsPre = s 10 DorlandsSuf =… … Wikipedia
Hertwig's epithelial root sheath — The Hertwig s epithelial root sheath (frequently abbreviated as HERS ) is a proliferation of epithelial cells located at the cervical loop of the enamel organ in a developing tooth. Hertwig s epithelial root sheath initates the formation of… … Wikipedia
Outer root sheath — The outer root sheath of the hair follicle encloses the inner root sheath and hair shaft.[1] It is continuous with the basal layer of the interfollicular epidermis (skin). References ^ James, William; Berger, Timothy; Elston, Dirk (2005) Andrews… … Wikipedia
cuticle of root sheath — the innermost layer of cells of the inner root sheath of a hair follicle adjacent to the hair … Medical dictionary
sheath — I (New American Roget s College Thesaurus) n. scabbard, sheathing, case, envelope, casing; involucre, capsule, fascia, lorica. See covering, receptacle. II (Roget s IV) n. Syn. case, scabbard, cover, spathe, sheathing, cere. Specialized sheaths… … English dictionary for students
sheath of Hertwig — sheath of Hert·wig hert .vig n a two layered epithelial wall that covers the developing root of a tooth, is derived from cells of the enamel organ, and later breaks up during the process of cement deposition called also Hertwig s sheath Hert·wig… … Medical dictionary
sheath — O.E. sceað, scæð, from P.Gmc. *skaithiz (Cf. O.S. scethia, O.N. skeiðir (pl.), O.Fris. skethe, M.Du. schede, Du. schede, O.H.G. skaida, Ger. scheide scabbard ), possibly from root *skaith divide, split (see SHED (Cf … Etymology dictionary
sheath — 1. Any enveloping structure, such as the membranous covering of a muscle, nerve, or blood vessel. Any sheathlike structure. SYN: vagina (1). 2. The prepuce of male animals, especially of the horse. 3. A specially designed tu … Medical dictionary
Root of penis — Infobox Anatomy Name = PAGENAME Latin = radix penis GraySubject = 262 GrayPage = 1249 Caption = The constituent cavernous cylinders of the penis. Caption2 = Vertical section of bladder, penis, and urethra. Precursor = System = Artery = Vein =… … Wikipedia
