The pelvic landmark(s) used to assess how far the baby's head has descended through the birth canal is/are the:
a. Symphysis pubis
b. Ischial spines
c. Linea terminalis
d. Ischial tuberosities
ANS: B
The ischial spines that form the posterior border of the ischium represent the shortest diameter of the pelvic cavity. They are used as landmarks to determine the descent of the baby's head.
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