Spinal Cord Part 1 (Quiz 3) Flashcards
(27 cards)
How many segments are there of the spinal cord?
31 segments
How many spinal nerves are there?
31 pairs
Where is the cervical enlargement?
C4-T1
Where is the lumbosacral enlargement?
L2-S3
The spinal cord ends caudally in a cone-shaped region, the _________________, at the level of the IVD between L1/L2
conus medullaris
Which spinal region has the most segments and nerves?
thoracic (12 segments, 12 pairs of nerves)
Which spinal region is the longest, heaviest, and largest region by volume?
thoracic region
The conus medullaris is the tapering inferior end of the spinal cord, that occurs in a newborn at the level of the body of _____. In adults, it occurs at the level of the inferior border of ______. This is clinically relevant in determining the appropriate position for performing lumbar puncture in children and adults
L3, L1
The _______________ is a bundle of spinal nerves and spinal nerve rootlets, consisting of the 2nd-5th lumbar nerve pairs, the 1st-5th sacral nerve pairs, and the coccygeal n.
cauda equina
Which spinal region has the most gray matter? Why?
cervical and lumbar bc of the cervical and lumbosacral enlargements for the appendages
Which spinal region has the most white matter? Why?
thoracic bc its mostly ascending and descending tracts here (nothing has to move horizontally)
Which spinal region has the least white matter?
sacral
What is AF?
anterior funiculus
What is AH?
anterior ventral horn
What is IG?
intermediate gray matter
What is LF?
lateral funiculus
What is PF?
posterior funiculus
What is PH?
posterior horn
What is A?
anterior white commissure
What is B?
anterior median fissure
What is the DAVE SAME mnemonic?
Are spinal nerves sensory, motor, or mixed?
mixed
Dorsal and ventral horns are grey matter. What is the difference between dorsal and ventral horns in terms of neurons?
dorsal horns contain UMNS
ventral horns contain LMNs
What are the 4 columns in a vertebral cross section?
1 ventral, 1 dorsal, and 2 lateral columns
