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| ==Introduction== | | ==Introduction== |
| + | [[Image:Corpus Luteum 1.jpg|thumb|right|200px|Histological Section of the Corpus Luteum showing Small Luteal Cells - Courtesy of J.Bredl, Copyright RVC 2008]] |
| + | [[Image:Corpus Luteum 2.jpg|thumb|right|200px|Histological Section of the Corpus Luteum showing Large Luteal Cells - Courtesy of J.Bredl, Copyright RVC 2008]] |
| 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 & 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]]. | + | The number of [[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 [[Corpus Luteum - Anatomy & Physiology|corpora lutea]] will be visible on the ovary of [[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 [[Corpus Luteum - Anatomy & Physiology|corpus luteum]]. |
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| ==Process of Luteinisation== | | ==Process of Luteinisation== |
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| *There is an increase in the pigment lutein within the leteal cells. | | *There is an increase in the pigment lutein within the leteal cells. |
| *There is development of smooth endoplasmic reticulum within luteal cells due to the increase in steroid production. | | *There is development of smooth endoplasmic reticulum within luteal cells due to the increase in steroid production. |
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| === Cell Differentiation === | | === Cell Differentiation === |
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| ==== Small luteal cells (<20µm) ==== | | ==== Small luteal cells (<20µm) ==== |
− | [[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]]
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| :* 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 & 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. |
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| ==== Large luteal cells (20-40µm) ==== | | ==== Large luteal cells (20-40µm) ==== |
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− | [[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]]
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| :*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 & 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. |
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| === Angiogenesis === | | === Angiogenesis === |
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| ===Luteinisation Control=== | | ===Luteinisation Control=== |
− | 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. | + | Control of [[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. |
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− | [[Category:Reproductive System - Anatomy & Physiology]] | + | {{OpenPages}} |
| + | [[Category:Female Reproduction]] |
| + | [[Category:Bullet Points]] |