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 the internal and external urethral sphincter

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Difference between the internal and external urethral sphincter 
Internal urethal sphincter
External urethal sphincter
Surrounds the internal urethral orifice
Surrounded by membranous part of urethra
Derived from the bladder musculature of trigonal region
Derived from the sphincter urethane muscle
Innervated by the sympathetic fibres (T 11-L2 segments)
Innervated by the somatic fibres (S2-4 segments)
Involuntary
Voluntary

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