PELVIS
*Two innominate(unnamed) /hip bones
*One sacrum(s1 to s5)
*One coccyx(c1 to C4)
Pelvic joints(4)
*Two sacroiliac joints
*One sacrococcygeal joint
*One symphysis pubis
Important land marks to know
The two most important landmarks are the ischial spines and the sacral promontory, which can be felt with the fingers during a vaginal examination.
*Ischeal spines(inferior view) 
*Sacral promontory(Anterior view) 
**Importance of Ischeal spines
1) The station of the fetal head is measured in centimetres above or below the ischial spines:
2) The ischial spines are the landmark for pudendal blocks.
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