external root sheath
英 [ɪkˈstɜːnl ruːt ʃiːθ]
美 [ɪkˈstɜːrnl ruːt ʃiːθ]
（毛）外根鞘
双语例句
- 20 ng · mL~ (-1) EGF could accelerate the differentiation of external root sheath cell in the hair follicle, and induce hair follicle to enter recessing period from growing period ahead of time.
mL-1EGF可促进毛囊外根鞘细胞分化，并诱导毛囊由生长期提前进入退行期。10ng。 - Hair-bulb looked like pellet, hair-papilla was evident, the bourn of internal root sheath and external root sheath was clear, the fiber of connective tissue sheath cell arrayed regularly.
毛球呈圆球形，毛乳头明显，内根鞘、外根鞘界限清楚，结缔组织性鞘细胞纤维规则排列。 - The bourn of internal root sheath and external root sheath was blurry, the fiber of connective tissue sheath cell arrayed disordered, the number of connective tissue cell reduced.
内根鞘、外根鞘界限模糊，结缔组织性鞘细胞纤维排列杂乱，结缔组织细胞减少。 - There are programmed death cells ( apoptotic cell) in isthmus, petiol and glomus of external root sheath of hair follicle when regressive phase begins.
退行期开始时，毛囊峡部、茎部和球部外毛根鞘内出现程序性死亡（Programmeddeath）细胞，即凋亡细胞（apoptoticcell）。 - The epidermis and its appendages ( hair follicles and associated glands) make up the external barrier of the body. Hair follicle is an important and complex epidermal appendage of skin, composed of hair shaft, inner root sheath and outer root sheath.
表皮和它的附属器（毛囊和相关腺体）构成了机体的外部屏障，而毛囊是皮肤重要而复杂的附属器，从内向外依次为毛干、内根鞘、外根鞘组成。