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| − | {{toplink
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| − | |backcolour = FAFAD2
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| − | |linkpage =Endocrine System - Anatomy & Physiology
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| − | |linktext =Endocrine System
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| − | |maplink = Endocrine System (Content Map) - Anatomy & Physiology
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| − | <br>
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| | ==The Parathyroid Glands== | | ==The Parathyroid Glands== |
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| | The parathyroid glands originate from the endoderm of pharyngeal pouches III and IV. The internal gland from pouch IV, external from pouch III. | | The parathyroid glands originate from the endoderm of pharyngeal pouches III and IV. The internal gland from pouch IV, external from pouch III. |
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| − | ===Histology=== | + | ===[[Parathyroid Gland - Histology|Histology]]=== |
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| − | * The parathyroids are histologically easy to distinguish from the [[Thyroid Gland - Pathology#Functional anatomy|thyroid]]. [[Image:Parathyroid Gland Active.jpg|thumb|right|350px|©RVC 2008]]
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| − | ** The thyroid has a characteristic follicular structure.
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| − | ** The parathyroid consists of densely packed cells, of two types:
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| − | **# Chief cells (Principal Cells)
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| − | **#* Are the predominant cell type
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| − | **#* Stain darker when active
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| − | **#* Are smaller than oxyphil cells
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| − | **#* Manufacture Parathyroid Hormone (PTH)
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| − | **# Oxyphil cells
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| − | **#* Are fewer in number than chief cells
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| − | **#* Stain lighter
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| − | **#* Are larger than chief cells
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| − | **#* Have unknown function
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| − | * Grossly, the parathyroids are difficult to differentiate from thyroid tissue or fat.
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| − | ** A parathyroid gland may be accidentally removed during thyroidectomy. Care must therefore be taken if the second thryoid is removed to leave the parathyroid intact, otherwise [[Parathyroid Glands - Pathology|hypoparathyroidism]] may ensue.
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| − | ====Histology Gallery====
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| − | <center><gallery>
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| − | Image:Parathyroid Gland Low power.jpg|<p>'''Parathyroid Gland Low Power 1'''</P><sup>©RVC 2008</sup>
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| − | Image:Parathyroid Gland Low Power 2.jpg|<p>'''Parathyroid Gland Low Power 2'''</P><sup>©RVC 2008</sup>
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| − | Image:Parathyroid Gland Active.jpg|<p>'''Parathyroid Gland with active Principal Cells'''</P><sup>©RVC 2008</sup>
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| − | Image:normalparathyroid.jpg|<p>'''Normal Parathyroid Gland'''</P> <sup> Image courtesy of of Biomed Image Archive.</sup>
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| − | </gallery></center>
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| | ===Blood Supply and Innervation=== | | ===Blood Supply and Innervation=== |
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| − | [[Category:Endocrine System]] | + | [[Category:Endocrine System - Anatomy & Physiology]] |