Macdonald, Alastair A

Chavatte, P

Fowden, A L

10

2006-05-11T15:30:07Z

2006-05-11T15:30:07Z

2000

Scanning electron microscopy was used to examine the microstructure of the maternal and fetal placenta from 25 pregnant ponies (Equus caballus) throughout the second half of gestation. Samples of placenta, 2–6 cm2in area, were collected from the antimesometrial region of the pregnant horn at 105 days (n=1), 165–219 days (n=5), 260 days (n=3), 270–277 days (n=3), 313–337 days (n=11) and immediately after spontaneous delivery at term (n=2). The maternal microcaruncle appears to be created from a clustering of about 16 uterine crypts encapsulated in a connective tissue sheath. There is a gestational increase in the depth of the microcaruncle during the second half of pregnancy. The fetal microcotyledon appears to be formed by a clustering of individual fetal villi. The length and branching of the villi increased considerably during the last 2–3 months of gestation. Tufts of from three to six branches were seen arising from close to the base of a villous stem. Branching of the villous stem occurred not only at the base but also along the secondary and tertiary branches. There was evidence of continued branching at the tips of the villi in the few days before birth.

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Placenta, Volume 21, Issues 5-6 , July 2000, Pages 565-574

doi:10.1053/plac.2000.0510

http://hdl.handle.net/1842/1003

en

Elsevier/ Harcourt Publishers Ltd

Scanning electron microscopy

placenta

Equus caballus

fetal villi

Scanning Electron Microscopy of the Microcotyledonary Placenta of the Horse (Equus caballus) in the Latter Half of Gestation

Article