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 cervical and lumbar enlargement of spinal cord

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Difference between cervical and lumbar enlargement of spinal cord

Topic
Cervical enlargement
Lumbar enlargement
Extent
From C5 to T1 spinal segments
From L2 to S3 spinal segments
Vertebral level
From C3 to T1 vertebra
From T9 to L1 vertebrae
Wider circumference
About 38mm at the level of C6 segment
About 35mm at the level of S1 segments
Innervation
Muscles of upper limbs and their associated girdles
Muscles of the lower limb and their associated girdles

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