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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 monozygotic and dizygotic twin

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Difference between monozygotic and dizygotic twin  Topics Monozygotic twin Dizygotic twin Origin Single ovum fertilized by a single sperm (they are developed from one embryo splitting   into two embryos . They are developed from two different eggs, which are fertilized by sperms separately Fetal membrane 1.      monochorionic and diamniotic 2.      monochorionic and monochorionic 3.      dichorionic and diamniotic Always dichorionic and diamniotic Placenta One or two (usually one ) Two placenta Chorion One or two (usually one ) Usually two Amnion One or two (usually one ) Usually two Sex Same (two girls or two boys) Same or different (two girls or two boys or one girl and one boy ) Physic...
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Difference between pectoral and pelvic girdles

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Difference between pectoral and pelvic girdles Pectoral girdles Pelvic girdles Ossification both intramembranous and intracartilaginous Ossification: only intracartilaginous   It is situated in the shoulder region. It is situated in the hip region. The glenoid cavity of the scapula forms ball and socket joint with the humerus. A cup-shaped cavity called acetabulum forms ball and socket joint with the femur. The glenoid cavity present in the pectoral girdle is comparatively shallow. Acetabulum cavity present in the pelvic girdle is comparatively deep. It gives articulation to forelimb  bones. It gives articulation to hindlimb bones. The back muscles are attached to the pectoral girdle. The hip muscles are attached to the pelvic girdle. Two principal components clavicle and scapula remain separate Three ...
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Difference between greater sac and lesser sac

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Difference between greater sac and lesser sac Greater sac Lesser sac The greater sac , also known as the general cavity (of the abdomen) or peritoneum of the peritoneal cavity proper , is the cavity in the abdomen that is inside the peritoneum but outside the lesser sac It is connected with the lesser sac via the omental foramen also known as the foramen of Winslow or epiploic foramen , The lesser sac , also known as the omental bursa , is the cavity in the abdomen that is formed by the lesser and greater omentum. Usually found in mammals, it is connected with the greater sac via the omental foramen It extends across entire area of abdomen and from diaphragm to  pelvic floor irregular space that lies behind liver, lesser omentum, stomach, upper ant part of greater omentum 5 recesses: Subphrenic recess – peritoneal pocket between diaphram & antero superior  part of liver separates into...
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