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Zatrzymanie łożyska u psów i kotów - Vetkompleksowo – serwis dla lekarzy weterynarii
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Wyszukaj w serwisie


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Zatrzymanie łożyska u psów i kotów


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U psów i kotów występuje łożysko śródbłonkowo-kosmówkowe (łac. placenta endotheliochorialis). Jego część płodową tworzy omoczniokosmówka, powstała ze zrośnięcia się błon płodowych omoczni i kosmówki, której kosmki wchodzą w kontakt ze śródbłonkiem naczyń krwionośnych błony śluzowej macicy, tworzącej część matczyną łożyska. Z uwagi na swój kształt łożysko zwierząt z rzędu drapieżne (łac. Carnivora), do którego należą między innymi rodziny psowate (łac. Canidae) i kotowate (łac. Felidae), jest nazywane popręgowym (łac. placenta zonaria) (ryc. 1). Jedną z jego cech jest połączenie części płodowej z matczyną na tyle ścisłe, że podczas porodu dochodzi do krwawień z powierzchni miejsc ułożyskowienia, zwanych miejscami placentacji.

W klasycznym ujęciu trzeci okres porodu jest fazą wypierania błon płodowych/łożysk. Jednak u zwierząt wielopłodowych dzieje się to już podczas drugiego okresu porodu (wypierania płodów).

Błony płodowe mogą być wyparte wraz z płodem lub po pewnym czasie liczonym w minutach lub godzinach. Podczas porodu występują okresowo skurcze myometrium, przesuwające płody w kierunku ujścia dróg rodnych (z reguły naprzemiennie z obu rogów macicy), co jednocześnie sprzyja oddzielaniu się łożysk.

Proces wypierania błon płodowych/łożysk powinien zakończyć się do 24 godzin po urodzeniu ostatniego płodu. Następuje okres poporodowy, podczas którego narządy rozrodcze stopniowo powracają do stanu wyjściowego sprzed ciąży. Ustępują obrzęki i zanika zwiotczenie tkanek w obrębie miednicy, krocza i sromu. Macica kurczy się i zmniejsza, a jej zawartość jest wydalana na zewnątrz, a częściowo resorbowana.

[...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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Poznaj nasze serwisy