Gross Anatomy of the CNS Part 2: Spinal Cord and CNS Protection

Question 1

what are the segments of the spinal cord

Answer 1

cervical, thoracic, lumbar, sacral, coccygeal

Question 2

what are the 3 segments of the grey matter in the spinal cord

Answer 2

PH (Posterior/dorsal horn), IG (intermediate gray), AH (anterior horn)

Question 3

Explain the reflex arc

Answer 3

1. incoming sensory signals from the body synapse at the posterior/dorsal horn with interneurons in the intermediate gray.
   2, interneurons signal to motor nerve fibers in the anterior horn and stimulate movemengt

Question 4

three colums in spinal cord

Answer 4

Posterior colums (touch and position
Lateral corticospinal tract (commands for voluntary movementts)
spinothalamic tract (pain and temperature)

Question 5

3 layers of meningnes

Answer 5

dura matter, arachnoid, pia mater

Question 6

dura is

Answer 6

thick connective tissue

Question 7

arachnoid and pia are

Answer 7

thinner collagenous membranes

Question 8

arachnoid villi definition and purpose

Answer 8

allow csf to go into venous system. controles pressure. oupouchings that poke holes in the walls of the venous system.

Question 9

four layers of the BBB

Answer 9

endothelial cell layer, pericyte layer, protecting basement membrane, glial barrier formed by astrocyte endfeet

Question 10

function of astrocytes

Answer 10

provide nutrients to nerve cells, control chemical composition f fluids around nerve cells enabling them to thrive