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 elastic and fibrocartilage

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Difference between elastic and fibrocartilage

Features
Elastic cartilage
Fibrocartilage
Distribution
Epiglottis, external ear and ear canal, auditory tube, some laryngeal cartilage( corniculate, cuneiform etc.)
Intervertebral discs and pubic symphysis, articular discs of temporo-mandibular, sternoclavicular joint, menisci of the knee joint
Function
Provides flexible support
Resist deformation under stress
Presence of perichondrium
Yes
No
Undergoes  calcification
No
Yes (during bone repair)
Cell types
Chondroblasts, chondrocytes
Chondrocytes, fibroblasts
Extracellular matrix
Type II collagen fibrils and elastic fibers
Type II & type I collagen fibers
Slide identification
*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)
Cartilaginous matrix: thick collagen fibres located between parallel rows of condrocytes
*Cells: the chondrocytes are smaller than those of hyaline or elastic cartilage and they are arranged in  parallel rows between the bundles of  thick collagen fibers
*Perichondrium: absent



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