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 eccrine and apocrine sweat gland

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Difference between eccrine and apocrine sweat gland
Topics
eccrine sweat gland
apocrine sweat gland
Distribution
Entire body surface except for the lips and part of the external genitalia
Axilla , areola , nipple of mammary gland , skin around the anus and the external genitalia
Lumen of secretory portion
Narrow
Wider
Overall diameter of secretory coil
500-700 µm
800 µm
Diameter of individual secretory tubule
30-40 µm
80-100 µm
Composition of secretory unit
single layer,
contain three type of cells :
clear cells , dark cells and myoepithelial cells
single layer columnar cells
contain single cell type with myoepithelial cells
Duct opens to
skin surface
hair follicle, sometimes nearby skin surface
Overall diameter of secretory coil
500-700 µm
800 µm
Function
Temperature regulation
May function as pheromones in human. Male pheromones in the secretion of apocrine glands have a direct effect on the female menstruation cycle
Similarity 
Composition of ductal epithelium
Stratified  cuboidal cells lacks myoepithelial cells
Stratified  cuboidal cells lacks myoepithelial cells
Nerve innervations
It is innervated by sympathetic portion of autonomic nervous system
It is innervated by sympathetic portion of autonomic nervous system

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