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Showing posts from January, 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 blood capillary and lymphatic capillary

Difference between blood capillary and lymphatic capillary Blood capillary Lymph capillary basal lamina is present absent pericytes are present absent permeable to crystalloid permeable to colloids increase pressure of tissue fluid  collapse blood capillary increase pressure of tissue fluid the lymph capillary lumen remains patent it is the continuation of arteriole it start as blind end tube it is present in central nervous system it is absent in central nervous system blood capillary end into  venule lymph capillaries  end into lymphatic vessel which is connected by lymph node its diameter smaller than lymph capillary its diameter more than the blood capillary endothelium is usually continuous one end of the endothelium is overlap so lymph enter to the capillar...