Changes

==Introduction==

==Introduction==

Luteinisation occurs after ovulation and the collapse of the follicle.

Luteinisation occurs after ovulation and the collapse of the follicle.

The number of [[The_Ovary_-Corpus_Luteum_-_Anatomy_%26_Physiology|corpora lutea]] formed in the ovary at any one time is directly proportional to the number of oocytes ovulated. Therefore many [[The_Ovary_-Corpus_Luteum_-_Anatomy_%26_Physiology|corpora lutea]] will be visible on the ovary of [[Gestation_-Litter_Sizes_-_Anatomy_%26_Physiology|polytocous]] animals. During Luteinisation there is an increase in both the size and weight due to hyperplasia (increase in cell number) and hypertrophy (increase in cell size) within the developing [[The_Ovary_-Corpus_Luteum_-_Anatomy_%26_Physiology|corpus luteum]].

The number of [[The_Ovary_-Corpus_Luteum_- Anatomy & Physiology|corpora lutea]] formed in the ovary at any one time is directly proportional to the number of oocytes ovulated. Therefore many [[The_Ovary_-Corpus_Luteum_- Anatomy & Physiology|corpora lutea]] will be visible on the ovary of [[Gestation_-Litter_Sizes_- Anatomy & Physiology|polytocous]] animals. During Luteinisation there is an increase in both the size and weight due to hyperplasia (increase in cell number) and hypertrophy (increase in cell size) within the developing [[The_Ovary_-Corpus_Luteum_- Anatomy & Physiology|corpus luteum]].

=Process of Luteinisation=

=Process of Luteinisation=

[[Image:Corpus Luteum 1.jpg|thumb|right|150px|Histological Section of the Corpus Luteum showing Small Luteal Cells - Courtesy of J.Bredl, Copyright RVC 2008]]

[[Image:Corpus Luteum 1.jpg|thumb|right|150px|Histological Section of the Corpus Luteum showing Small Luteal Cells - Courtesy of J.Bredl, Copyright RVC 2008]]

:* Formed from remodelled Follicular Theca cells. These cells proliferate during luteinisation.

:* Formed from remodelled Follicular Theca cells. These cells proliferate during luteinisation.

:*These cells contain many lipid droplets within their cytoplasm, an important source of cholesterol esters for [[Ovaries Endocrine_Function__-_Anatomy_%26_Physiology#Progesterone|Progesterone]] synthesis.

:*These cells contain many lipid droplets within their cytoplasm, an important source of cholesterol esters for [[Ovaries Endocrine_Function__- Anatomy & Physiology#Progesterone|Progesterone]] synthesis.

[[Image:Corpus Luteum 2.jpg|thumb|right|150px|Histological Section of the Corpus Luteum showing Large Luteal Cells - Courtesy of J.Bredl, Copyright RVC 2008]]

[[Image:Corpus Luteum 2.jpg|thumb|right|150px|Histological Section of the Corpus Luteum showing Large Luteal Cells - Courtesy of J.Bredl, Copyright RVC 2008]]

:*Formed from Follicular Granulosa cells that have undergone hypertrophy.  

:*Formed from Follicular Granulosa cells that have undergone hypertrophy.  

:*These large luteal cells are the endocrine cells of the corpus luteum producing large amounts of the hormone [[Ovaries_Endocrine_Function_-_Anatomy_%26_Physiology#Progesterone|Progesterone]].

:*These large luteal cells are the endocrine cells of the corpus luteum producing large amounts of the hormone [[Ovaries_Endocrine_Function_- Anatomy & Physiology#Progesterone|Progesterone]].

:*In some species secretory granules containing oxytocin or relaxin may be found close to the cell membrane.

:*In some species secretory granules containing oxytocin or relaxin may be found close to the cell membrane.

*There is an increase cappilary cells and fibroblasts within the developing corpus luteum

*There is an increase cappilary cells and fibroblasts within the developing corpus luteum

*The extent to which the corpus luteum is vascularised may determine its functional capabilities as a large blood supply is required to provide adequate cholosterol for [[Ovaries_Endocrine_Function_-_Anatomy_%26_Physiology#Progesterone|Progesterone]] synthesis.

*The extent to which the corpus luteum is vascularised may determine its functional capabilities as a large blood supply is required to provide adequate cholosterol for [[Ovaries_Endocrine_Function_- Anatomy & Physiology#Progesterone|Progesterone]] synthesis.

==Luteinisation Control==

==Luteinisation Control==

Control of [[The_Ovary_-Corpus_Luteum_-_Anatomy_%26_Physiology|corpus luteum]] formation and development as well as the production of [[Ovaries_Endocrine_Function_-_Anatomy_%26_Physiology#Progesterone|Progesterone]] by luteal cells is regulated principally by Luteinising Hormone.

Control of [[The_Ovary_-Corpus_Luteum_- Anatomy & Physiology|corpus luteum]] formation and development as well as the production of [[Ovaries_Endocrine_Function_- Anatomy & Physiology#Progesterone|Progesterone]] by luteal cells is regulated principally by Luteinising Hormone.

[[Category:Reproductive System - Anatomy & Physiology]]

[[Category:Reproductive System - Anatomy & Physiology]]