498.During a rhizotomy, the denticulate ligament is used as a landmark
to distinguish dorsal from ventral roots. The denticulate ligament attaches
cranially from the spinal cord to occipital dura and extends caudally to
about which vertebral level in most adults?
a. C1
b. T1
c. T8
d. L1
e. S2
499.A physician examines a patient who complains of pain and paresthesia
in the left leg. The distribution of the pain, running down the lateral aspect
of the leg and the dorsal surface of the foot, is suggestive of a herniated inter-
vertebral disk. The physician links the distribution of symptoms with nerve
L5 and concludes that herniation has occurred at which location?
a. L3–L4 intervertebral disk
b. L4–L5 intervertebral disk
c. L5–S1 intervertebral disk
d. S1–S2 intervertebral disk
e. Insufficient data to determine
586 Anatomy, Histology, and Cell Biology