| 词条 | Placental cotyledon |
| 释义 |
| Name = Placental cotyledon | Latin = | Image = Placental cotyledon.png | Caption = Structure of the placenta, with a placental cotyledon marked in rectangle. | Image2 = | Caption2 = | Precursor = | System = | Artery = | Vein = | Nerve = | Lymph = }} RuminantsThe Artiodactyla have a cotyledonary placenta. In this form of placenta the chorionic villi form a number of separate circular structures (cotyledons) which are distributed over the surface of the chorionic sac. Sheep, goats and cattle have between 72 and 125 cotyledons whereas deer have 4-6 larger cotyledons. [1] [2]HumanThe form of the human placenta is generally classified as a discoid placenta. Within this the cotyledons are the approximately 15-25 separations of the decidua basalis of the placenta, separated by placental septa.[3] Each cotyledon consists of a main stem of a chorionic villus as well as its branches and subbranches etc.[3] VasculatureThe cotyledons receive fetal blood from chorionic vessels, which branch off cotyledon vessels into the cotyledons, which, in turn, branch into capillaries.[4] The cotyledons are surrounded by maternal blood, which can exchange oxygen and nutrients with the fetal blood in the capillaries. References1. ^{{cite web |url=http://placentation.ucsd.edu/placenfs.html |author=Kurt Benirschke |year=2007 |title=Placentation |access-date= 13 January 2017}} 2. ^{{cite web |url=http://www.luckyhit.net/goats001.htm |title=Cotyledonary Placenta: An Easy To Understand Explanation |author=Erick Conard |year=2002 |access-date= 13 January 2017}} 3. ^1 Page 565 in: {{cite book |author1=Varney, Helen |author2=Helen Varney Burst |author3=Kriebs, Jan M. |author4=Gegor, Carolyn L. |title=Varney's midwifery |publisher=Jones and Bartlett Publishers |location=Boston |year=2004 |pages= |isbn=0-7637-1856-4 |oclc= |doi= |accessdate=}} [https://books.google.com/books?id=c5dn3yh4V5UC] 4. ^{{Cite journal | doi = 10.1111/j.1469-7580.2007.00819.x | last1 = Gordon | first1 = Z. | last2 = Elad | first2 = D. | last3 = Almog | first3 = R. | last4 = Hazan | first4 = Y. | last5 = Jaffa | first5 = A. J. | last6 = Eytan | first6 = O. | title = Anthropometry of fetal vasculature in the chorionic plate | journal = Journal of Anatomy | volume = 211 | issue = 6 | pages = 698–706 | year = 2007 | pmid = 17973911 | pmc = 2375851}} External links
2 : Vertebrate developmental biology|Embryology |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。