Saturday, 30 September 2017

True about spinal cord | PGI Nov 2017 Preparations MCQ


True about spinal cord: 

A. in adults spinal cord ends at lower border of L1 vertebra 
B. in newborn may extend up to L3 
C. Cauda equina extends from lumbar vertebra to coccyx 
D. In embryonic period cord extends up to coccyx 
E. It has same diameter all throughout the length.



Answer. A. In adult spinal cord ends at lower border of L1; (B) In newborn may extend up to L3; (C) Cauda equina extends from lumbar vertebra to coccyx; (D) In embryonic period cord extends up to coccyx.
• Spinal cord extends from the level of upper border of atlas to the lower border of L1 or upper border of L2 vertebra .it is about 45cm long
• It has 31 pairs of spinal nerves.
• Below the lower end of spinal cord the roots form a bundle known as cauda equina
• The spinal cord first extends throughout the length of vertebral canal. Subsequently, recession of spinal cord occurs so that at full term lower end of spinal cord is at level of L3 vertebra.
Adult lower end of spinal cord is at level of L1 vertebra