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 medial and lateral longitudinal arches of foot

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Difference between medial and lateral longitudinal arches of foot


Medial longitudinal arch
Lateral longitudinal arch
It is made up by the calcaneus, the talus, the navicular, the three cuneiforms (medial, intermediate, and lateral), and the first, second, and third metatarsals
It is composed of the calcaneus, the cuboid, and the fourth and fifth metatarsals
The medial arch is higher than the lateral longitudinal arch.
It  is lower than the medial  longitudinal arch.
It is formed by more bones and joints
It is formed by less bone and joint
It is more mobile
It is less mobile
It acts as shock absorber
It commonly bears body weight
Its summit is at the superior articular surface of the talus
The peak of the lateral longitudinal arch is located at the level of articular facets on the superior outermost layer of the calcaneum (i.e., at the level of subtalar joint).
  • The medial half of the calcaneum creates the posterior column of the medial longitudinal arch.
  • The heads of the medial 3 metatarsals create the anterior column of the medial longitudinal arch.
The posterior column of the lateral longitudinal arch is composed by the lateral tubercle of the calcaneum and the anterior column is composed by the heads of the lateral 2 metatarsals.
The key joints of the medial longitudinal arch are talocalcaneonavicular and subtalar joints.
The primary joint of the lateral longitudinal arch is calcaneocuboid joint.
 

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