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Oestrous Cycle - Anatomy & Physiology (view source)
Revision as of 14:37, 10 September 2008
, 14:37, 10 September 2008→Cyclic Changes in the Ovaries
* During oestrus there will also be little difference in size.
* During oestrus there will also be little difference in size.
** If the ovary undergoing enlargement of a dominant follicle also contains a regressing corpus luteum, it will be a little larger than the other ovary but not strikingly so.
** If the ovary undergoing enlargement of a dominant follicle also contains a regressing corpus luteum, it will be a little larger than the other ovary but not strikingly so.
==== Ovaries in a Multiparous Cow ====
==== Ovaries in a Multiparous Cow ====
* The corpus luteum of pregnancy does not atrophy as quickly after parturition as the corpus luteum of the cycle. It becomes invaded by scar tissue and remains throughout the cow's life.
* The corpus luteum of pregnancy does not atrophy as quickly after parturition as the corpus luteum of the cycle. It becomes invaded by scar tissue and remains throughout the cow's life.
* The fully developed corpus luteum is present by day 7 and persists unchanged until the onset of pro-oestrus at day 19-20.
* The fully developed corpus luteum is present by day 7 and persists unchanged until the onset of pro-oestrus at day 19-20.
==== Appearance of the Ovaries on Ultrasound ====
* Normal structures that can be identified:
** Ovarian stroma: Mottled echotexture
** Antral follicles: Anechoic (black) structures of variable size with a clear definition between the follicular wall and the antral cavity. They will not always be a regular, spherical shape.
** Corpora lutea: Well defined border and a mottled echogenic appearance. They are less echogenic than the ovarian stroma. The fluid-filled lacuna can be identified as a dark, non-echogenic area in the centre.
** Ovarian blood vessels: Black,non echogenic structures which are easily confused with antral follicles. Movevement of the transducer can be used to differentiate the two, as this shows their elongated structure.
* In addition, pathological structures like ovarian cysts can be seen.
= Links =
= Links =
[[Oestrous_Cycle_-Pharmacological_Manipulation_of_Oestrous_Cycles_-_Anatomy_%26_Physiology|Pharmacological Manipulation of Oestrous Cycles]]
[[Oestrous_Cycle_-Pharmacological_Manipulation_of_Oestrous_Cycles_-_Anatomy_%26_Physiology|Pharmacological Manipulation of Oestrous Cycles]]