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 upper and lower part of anal canal

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Difference between upper and lower part of anal canal
Features
Upper anal canal
Lower anal canal
Length
15mm
23mm
Extension
Anorectal junction to pectinate line
Pectinate line to anal orifice
Internal features
Anal columns
Anal valves
Anal sinuses
Pectinate line
White line of Hilton
Development
From endoderm of the hindgut
From ectoderm of proctodeum
Innervations
Autonomic nerves hence insensitive to pain and temperature
Somatic nerves, hence sensitive to pain and temperature

Lining epithelium
Simple columnar epithelium (upper part of upper part of anal canal )
Stratified columnar epithelium (lower part of upper part of anal canal )

From pectinate line to white line of Hilton non-keratinized Stratified  squamous epithelium  
From white line of Hilton to anal orifice : keratinized stratified squamous epithelium
Gland
Simple tubular gland present in lower part
Sweat and sebaceous gland present in lower part
Arterial supply
Superior rectal artery
Inferior rectal artery
Hair
Not present
Hair present near the anal orifice
Venous supply
Superior rectal vein draining into portal system
Inferior rectal vein draining into caval system
Lymphatic drainage
Internal iliac lymph nodes
Superficial inguinal lymph nodes
(horizontal set )
Hemorrhoids
Internal hemorrohoids
External hemorrhoids
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