Question

what do arrows a and b point to? a large wedge - shaped bone at the inferior end of the spine with arrow a pointing to the top of it and arrow b pointing to another small, fused bone that articulates with the bone above. a) ala of sacrum b) coccyx a) body of sacral vertebra b) sacral hiatus a) sacral promontory b) coccyx a) median sacral crest b) sacrococcygeal joint

Explanation:

The large wedge - shaped bone at the inferior end of the spine is the sacrum. The top of the sacrum is the sacral promontory (arrow A). The small, fused bone that articulates with the bone above (sacrum) is the coccyx (arrow B).

Answer:

C. sacral promontory b) coccyx