biology notes

  SPINAL CORD ★ THE SPINAL CORD IS IN FACT A TUBULAR BUNDLE OF NERVES.   STARTS FROM; ★ IT STARTS FROM BRAIN STEM AND EXTENDS TO LOWER BACK. SPINAL CORD IS THE    CONTINUATION OF MEDULLA OBLONGATA. MEDULLA OBLONGATA NARROWS DOWN    INTO AN OVAL SHAPED HOLLOW CYLINDER, THE SPINAL CORD, RUNNING THROUGH     THE VERTEBRAL COLUMN. CONSIST OF; ★ IT CONSIST OF A VERY LARGE NUMBER OF NEURONS. THE CELL-FIBRES AND BODIES     OF WHICH ARE ARRANGED IN A DEFINITE PATTERN. COVERED BY; ★ LIKE BRAIN, SPINAL CORD IS ALSO COVERED BY  MENINGES. THE VERTEBRAL    COLUMN SURROUNDS AND PROTECTS SPINAL CORD. SIZE OF SPINAL CORD; ★ SPINAL CORD IS ROUGHLY 40cm LONG AND ABOUT AS WIDE AS YOUR THUMB FOR    MOST OF ITS LENGTH. REGIONS OF SPINAL CORD; OUTER REGION; ★ THE OUTER REGION OF SPINAL CORD IS MADE OF WHITE MATTER . ★ CONTAINING MYELINATED AXONS. CENTRAL REGION; ★ THE CENTRAL REGION IS BUTTERFLY SHAPED THAT SURROUNDS THE CEN...