Histological characterization of umbilical cord in alpaca (Vicugna pacos)

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Abstract

The histomorphometric features of umbilical cord constituents in seven foetuses of alpaca (Vicugna pacos) from Cerro de Pasco, Department, Peru, were determined. Sections of 2–5 cm of umbilical cord were fixed in 10% neutral buffered formalin and processed for light microscopy. Standard histological slides stained with haematoxylin and eosin, Masson's trichrome and Van Gieson's trichrome were obtained. Histologically, common features of umbilical artery and vein were observed as well as mucous connective tissue, some cell features that compound this tissue constituted by cells presented features of myofibroblasts. Among most important findings that were observed, the lumen of umbilical vein was obliterated into star-shaped form with the thinner umbilical artery wall; the smooth muscles and fibroblast were comparatively more in number in umbilical artery than that of umbilical vein, and the tunica media was larger in dimension than the tunica adventitia in umbilical vein. Conclusively, this histological study features an observation of the umbilical cord of alpaca foetuses and shows the similarity between them and those of other mammal species, including dromedaries and South American camelids.

Original languageEnglish
Pages (from-to)533-538
Number of pages6
JournalJournal of Veterinary Medicine Series C: Anatomia Histologia Embryologia
Volume46
Issue number6
DOIs
StatePublished - Dec 2017
Externally publishedYes

Bibliographical note

Funding Information:
All applicable international, national and/or institutional guidelines for the care and use of animals were followed. All the animals were humanely treated during sample collection in accordance with the rules of the Medical Ethics and Animal Care Committee of the Universidad Nacional Mayor de San Marcos (UNMSM), Lima, Peru (no protocol number was assigned), which adhere to the Public Health Service (PHS) policies of the Office of Laboratory Animal Welfare, Office of Extramural Research, National Institutes of Health (OLAH-OER-NIH), USA (PHS approved assurance number A5934-01).

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