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 oogenesis

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 Difference between different cells of oogenesis 

Cell type

ploidy/chromosomes

chromatids

Process

Time of completion

Oogonium

diploid/46(2N)

2C

Oocytogenesis (mitosis)

Third trimester

primary oocyte

diploid/46(2N)

4C

Ootidogenesis (meiosis I) (Folliculogenesis)

Dictyate in prophase I for up to 50 years

secondary oocyte

haploid/23(1N)

2C

Ootidogenesis (meiosis II)

Halted in metaphase II until fertilization

Ootid

haploid/23(1N)

1C

Ootidogenesis (meiosis II)

Minutes after fertilization

Ovum

haploid/23(1N)

1C

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