The human ear's pinna is the funnel shaped lobe of flesh that sticks out on either side of the head. It serves to filter and focus directional sound. The pinna notch occurs because the pinna works differently for high frequency sounds than low frequency sounds. Those above a certain threshold are reflected off of the pinna's contours, bouncing back out before they enter the ear.
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Neural stem cells represent the cellular backup of our brain. These cells are capable of self-renewal to form new stem cells or differentiate into neurons, astrocytes or oligodendrocytes. Astrocytes have supportive functions in the environm...
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