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Transcript 
Histology of
Pituitary Gland
Inactive
gonadotropes
thyrotropes
corticotropes
somatotropes
lactotropes
17-2
Histology of the Thyroid Gland
17-4
Thyroid Gland
• Thyroid follicles
– filled with colloid and lined with simple cuboidal epithelial
(follicular cells) that secretes two hormones, T3 and T4
– thyroid hormone
•
•
•
•
•
 body’s metabolic rate and O2 consumption
calorigenic effect -  heat production
 heart rate and contraction strength
 respiratory rate
stimulates appetite and breakdown CHO, lipids and proteins
• C (calcitonin or parafollicular) cells
– produce calcitonin that  blood Ca2+ , promotes Ca2+
deposition and bone formation especially in children
17-6
Adrenal Gland
17-7
• Layers
Adrenal Cortex
– zona glomerulosa (outer)
– zona fasciculata (middle)
– zona reticularis (inner)
17-8
• Layers
Adrenal Cortex
– zona glomerulosa (outer) - aldosterone
– zona fasciculata (middle)
– zona reticularis (inner)
17-9
• Layers
Adrenal Cortex
– zona glomerulosa (outer)
– zona fasciculata (middle) cortisol
– zona reticularis (inner)
note blood
sinuses
17-10
• Layers
Adrenal Cortex
– zona glomerulosa (outer)
– zona fasciculata (middle)
– zona reticularis (inner) some sex steroids
17-11
Adrenal Medulla
• Epinephrine
• Chromaffin cells are modified neurons
17-12
Zona fasciculata
Zona reticularis
Zona glomerulosa
Zona fasciculata
Adrenal medulla
Chromaffin cells
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