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 oogenesis and spermatogenesis

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Difference between oogenesis and spermatogenesis
Location
Testes
Ovary
Number of gamete produce
Life long production (millions)
Fixed amount ( only mature 400)
Per day gemate produce
Millions sperm produce per day
One ovum  per 28 days cycle
Gamete per germ cells
Four
One ovum and 2-3 polar body
Beginning of the process
At puberty
At fetal life
Time of gamete formation
Continuous
Once in a month
End of process
Life long but reduces in later part of life
End at menopause
Time of gamete release
Anytime
Once in a month
Meiotic division
Uninterrupted
Arrested
Name of immature cell
Oogonia
Spermatogonia
Name of mature cell
Ovum
Spermatozoa
Release of germ cell
During ejaculation
During ovulation
Motility of mature germ cell
Motile
Not motile

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