Comparison between tract and nerve

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  Comparison between tract and nerve Nerve Nerve contain bundle of axons (nerve fibers) in the peripheral nervous system (PNS) that transmits signals between the central nervous system (CNS) and other parts of the body. It is the most important part of peripheral nervous system Location: Peripheral nervous system. Structure: Made of axons, connective tissue layers (endoneurium: axon is surrounded by it , perineurium: bundle of axons are surrounded by it, epineurium: whole nerve trunk is surrounded by it), and blood vessels. It gets myelination by Schwann cell   Function: Carries sensory signals to the CNS (afferent) from peripheral part of body or motor signals carry from from the CNS (efferent) to target organs like skeletal muscle, cardiac muscle, smooth muscle or glands Example: Sciatic nerve, median nerve, except optic nerve (though optic nerve is technically part of CNS in develop...
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Difference between follicular cells and para-follicular cells

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Difference between follicular cells and para-follicular cells 


Topics
Follicular cells
Para-follicular cells
Secretion
T3 and T4
Calcitonin
Shape and size of cell
It is smaller than the parafollicular cell. The shape of the cell vary according to functional state of gland: from simple squamous to low columnar epithelium
It is larger than the follicular cell and the shape of the cell is Round
Staining
It takes more staining
It takes less staining
Exposure to luminal surface
It is exposed to luminal surface
It is never exposed to luminal surface, it is located peripheral part of thyroid follicle  
Nuclei
It contains comparatively dark nuclei with two or three prominent nucleoli
It contain large pale stain nuclei
Golgi complex
Golgi complex are supranuclear in position
Large amount of  golgi complex are present but  no definite location
Secretory vesicles
Few and Present in apical region  
It contains numerous secretory vesicle present though out of the cell
rER
Present basally
Present in small amount  but no definite location
Lysosome
Abundant
Present but not abundant
Endocytotic vesicles or colloidal resorption droplets
Present in the apical region of cell
No present
Microvilli
Present
Absent
Development
Thyroglossal duct
4th pharyngeal pouch
Derived from
Endoderm
Neural crest

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