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Showing posts from February, 2017

Comparison between tract and nerve

  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...

Difference between microfilament, intermediate filaments and microtubule

Topics Microfilament Intermediate filaments Microtubules Features Thin, flexible filaments Strong, stable structures Exhibit dynamic instability Shape Double stranded linear helical array Ropelike fibers Non-branching long hollow cylinders Protein G-actin Different types of proteins Dimmers of α tubulin and β tubulin Enzymatic activity ATP hydrolytic activity None GTP hydrolytic activity Polarity Yes, both end grow  No Yes one growing end and other non-growing  end  Source of energy required for assembly ATP N/A GTP Location in cell Terminal web, core of microvilli, concentrated beneath the plasma membrane , contractile elements of muscles Extend across cytoplasm connecting desmosomes and hem...

Difference between organelle and inclusion

Difference between organelle and inclusions Organelle Inclusions it is a structure within the cytoplasm that has a specific function . they are stored nutrients secretory product and pigment granules Ex: lipid droplets in fat cells, pigment granules in certain cells of skin and hair, glycogen granules in the liver and muscle cells membranous organelle are separately enclosed within their own lipid bilayers some of inclusion such as pigment granules are surrounded by a plasma membrane but lipid droplets and glycogens are not surrounded by a plasma membrane they are living they are lifeless it is more organized at eukaryotic cell it is found in both eukaryotic and prokaryotic cell it is metabolically active it is metabolically inactive they are permanent structure of cell they are temporary or permanent  structure of cell they are cytoplasmic structu...

Joint : general anatomy

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Difference between dendrite and axon

Difference between dendrite and axon Dendrite Axon Nerve process of neuron received information from other neuron or from external environment  toward the nerve cell body Effector processes that transmit stimuli to other neuron or effector cells and carry information away from the cell body greater diameter than axon and usually short & tapered narrower than the dendrite and cylindrical  and extremely long (golgi type 1 neuron has axon  more than a meter to reach the effector organ but golgi type II neuron has very short axon unmyelinated myelinated but smaller axon of autonomic nervous system are unmyelinated and surrounded only by Schwann cell cytoplasm dendrite produces extensive arborizations called dendritic trees which significantly increase the receptors surface area of a neuron axon may give recurrent branch near the cell body: a branch of axon that turns back towards...