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 different cells of spermatogenesis

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 Difference between different cells of spermatogenesis

Cell type

ploidy/chromosomes in human

DNA copy number/chromatids in human

Process entered by cell

spermatogonium

diploid (2N) / 46

2C / 46

spermatocytogenesis (mitosis)

primary spermatocyte

diploid (2N) / 46

4C / 2x46

spermatidogenesis (meiosis I)

two secondary spermatocytes

haploid (N) / 23

2C / 2x23

spermatidogenesi (meiosis II)

four spermatids

haploid (N) / 23

C / 23

spermiogenesis

four functional spermatozoids

haploid (N) / 23

C / 23

spermiation

 


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