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 pre-axial and post axial border of upper and lower limb

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Pre-axial (cranial) and post-axial border of upper and lower limb
•         It demarcates portion of the limb bud that lies cranial to the axis of the limb e.g radial aspect of upper limb and tibial aspect of lower limb. It marked out by the cephalic vein in the upper limb, and the great saphenous vein in the lower limb
•         clinical relevance: pre-axial polydactyly involves first digit of the hand (radial side) or first digit of the foot (big toe)
Post-axial (caudal) border
it demarcates portion of the limb bud that lies caudal to the axis of the limb e.g. ulnar aspect of upper limb and fibular aspect of lower limb. It marked out by the basilic vein in the upper limb, and the small saphenous vein in the lower limb
Pre-axial border
Post-axial border
Upper limb
It extends from middle of the clavicle,
Distally along the front of the shoulder joint,
In the line of the cephalic vein,
Lateral border of arm ,forearm and hand to lateral border of the thumb

It extends from middle of the axilla
Along the medial side of arm along the line of  basilic vein
Medial side of forearm and hand
Medial border of the little finger

Lower limb
It extends from the middle of the inguinal ligaments
Medial side of the thigh and leg along the great saphenous vein
To the medial side of the great toe

It extends from the coccyx
It runs along the natal fold
Lateral surface of back of the thigh, leg along the small saphenous vein
Lateral border of foot and little toe


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