Clinical Anatomy of the Reproductive Tract
Female
Drawing of the reproductive tract of the female |
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Rear of a female pig |
Detail of the open vulva |
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The non pregnant female reproductive tract |
The female reproductive tract at parturition |
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Detail of the uterotubal junction |
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Ovaries Gross changes during the reproductive cycle |
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Anoestrus |
Follicles |
Corpora haemorrhagica |
Corpora lutea |
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The foetal membranes around 20 days of gestation |
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The mammary glands lateral view |
Detail of the nipple and one mammae |
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Cross section of the mammary gland, with ink injected post-mortem to delineate each of the two mammary glands supplying the common nipple |
Pregnancy in the pig
Day |
Event |
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- 1 |
Coitus |
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0.5-1 |
Ovulation |
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Capture of eggs |
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Descent through oviduct |
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Fertilization |
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2-3 |
Decent into uterus |
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3- 14 |
Free migration through both
horns |
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7 |
Hatching |
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10 |
Blastocyst oestrogens |
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7-14 |
Elongation to 1 metre |
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14-28 |
Implantation – min 2
per horn |
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14-17 |
Release of oestrogens |
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24 |
Organogenesis complete |
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35 |
Bone present |
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70 |
Immunocomplement |
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105 |
Foetal corticosteroids |
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115 |
Parturition |
Estimation of embryonic age
Crown Rump mm |
Days of pregnancy |
Crown-Rump = 80 mm \age ~ 48 days |
20 |
30 |
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50 |
40 |
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88 |
50 |
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130 |
60 |
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167 |
70 |
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200 |
80 |
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232 |
90 |
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264 |
100 |
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290 |
110 |
Easy calculator
[ (Crown-Rump length mm)/3 ] + 21 = age of foetus in days