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 hyaline cartilage and elastic cartilage

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Features
Hyaline cartilage
Elastic cartilage
Distribution
Tracheo-bronchial cartilage, costal cartilage of rib and nasal cartilage, most of the laryngeal cartilage 
Epiglottis, external ear 
and ear canal, auditory
 tube, some laryngeal 
cartilage( corniculate, 
cuneiform etc.)
Function
Resistant to compression, provides cushioning and low friction surface for joint , structural support in respiratory system
Provides flexible support
Presence of perichondrium
Yes (except articular cartilage and epiphyseal plates)
Yes
Undergoes  calcification
Yes ( during endochondral bone formation )
No
Cell types
Chondroblasts, chondrocytes
Chondroblasts, chondrocytes
Extracellular matrix
Type II collagen fibrils
Type II collagen fibrils and 
elastic fibers
Slide identification
*Cartilaginous matrix: is homogeneous
*Cells: Lacunae (ovoid space within the matrix) contain chondrocyte singly or isogenous groups
*Perichondrium: surround the cartilage (if present within the slide then add this points)
*Cartilage matrix contain 
elastic fiber so it is not
 homogenous Lacunae 
(ovoid space within 
the matrix) contain 
chondrocyte singly or 
isogenous groups
*Perichondrium surround 
the cartilage (if present 
within the slide then 
add this points)

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