Below L2, the vertebral canal is occupied by a bundle of spinal nerve roots called

a. the terminal filum

b. the descending tracts

c. the gracile fasciculus

d. the medullary cone

e. the cauda equina

The brachial plexus gives rise to all of the following nerves except.

a. the axillary nerve.

b. the radial nerve

c. the obturator nerve

d. the median nerve

e. the ulnar nerve

Nerve fibers adjust the tension in a muscle spindle are called

a. intrafusal fibers

b. extrafusal fibers

c. alpha motor neurons

d. gamma motor neurons

e. anulospiral fibers