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Oestrous Cycle - Anatomy & Physiology (view source)
Revision as of 14:10, 11 September 2008
, 14:10, 11 September 2008→Appearance of the Ovaries on Ultrasound
** During pregnancy, corpora lutea persist at their maximum size thoughout the pregnancy, but regress rapidly after parturition.
** During pregnancy, corpora lutea persist at their maximum size thoughout the pregnancy, but regress rapidly after parturition.
=== Appearance of the Ovaries on Ultrasound ===
* Developing antral follicles can be seen at the beginning of pro-oestrus.
** Appear circular and anechoic
* In oestrus, antral follicles are increased in size, reaching a maximum diameter of 4-13mm on day 13 (day 0 is the onset of pro-oestrus).
* From day 10 onwards, walls of the follicles become thickened due to pre-ovulatory luteinisation.
* No evidence of follicular collapse associated with ovulation.
* 25-30 days after the onset of pro-oestrus, the ovaries are difficult to identify.
=== Endocrine Changes during the Oestrous Cycle ===
=== Endocrine Changes during the Oestrous Cycle ===