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 location, functions & development of different skin cells

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Difference between location, functions & development of different skin cells

Cells of skin

Location

Functions

Development

Keratinocytes

stratum basale 

It forms barrier against environmental damage by heat, UV radiation, dehydration, pathogenic bacteria, fungi, parasites, and viruses.

Surface ectoderm

Melanocytes

Stratum basale

Melanocytes are well known for their role in skin pigmentation, and their ability to produce and distribute melanin has been studied extensively

Neural crest

Langerhans cells

Stratum spinosum

These cells act as the outermost guard of the cutaneous immune system and are likely to induce the first reactions against pathogens encountered via the skin

Fetal Langerhans cells from Primitive yolk sac in fetal life , in adult Langerhans cells  from fetal monocytes  

Merkel cells

Stratum basale

It is also known as tactile epithelial cells, which is an  oval-shaped mechanoreceptors essential for light touch sensation

Surface ectoderm

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