Changes

==Pars Intermedia==

==Pars Intermedia==

This is the residual lumen of Rathke's Pouch and consists of of a series of small cystic cavities (follicles filled with colloid), with both basophillic and chromatophobic (poorly staining) cell types. These extend into the Pars Nervosa.  

This is the residual lumen of '''Rathke's Pouch''' and consists of of a series of small cystic cavities (follicles filled with colloid), with both basophillic and chromatophobic (poorly staining) cell types. These extend into the '''pars nervosa'''. In horses, '''melanotropes''' convert the [[Prohormones - Anatomy & Physiology|prohormone]] ''proopiomelanocorticotropin'' (POMC) to ''melanocyte Stimulating Hormone'' (a-MSH) and ''corticotropin-like intermediate lobe peptide'' (CLIP):

In horses, '''Melanotropes''' convert the [[Prohormones - Anatomy & Physiology|prohormone]] ''Proopiomelanocorticotropin'' (POMC) to ''Melanocyte Stimulating Hormone'' (a-MSH) and ''Corticotropin-like Intermediate lobe Peptide'' (CLIP):

'''POMC --> ACTH --> a-MSH + CLIP'''

Stage 1 uses the enzyme, '''Prohormone Convertase I''' and stage 2 uses the enzyme, '''Prohormone Convertase II'''. These processes are NOT under [[Negative Feedback - Anatomy & Physiology|negative feedback control]].

 

Stage 1 uses the enzyme ''Prohormone Convertase I''.

Stage 2 uses the enzyme ''Prohormone Convertase II''.

These processes are NOT under [[Negative Feedback - Anatomy & Physiology|negative feedback control]].

==Posterior Pituitary Gland==

==Posterior Pituitary Gland==