Human sacrum and coccyx, overview.
Phoenix College Instructional Media &amp; Technology
CC BY 3.0
From YouTube video "Sacrum and Coccyx". Video URL is <a rel="nofollow" class="external free" href="https://www.youtube.com/watch?v=s6UZArZuaus">https://www.youtube.com/watch?v=s6UZArZuaus</a>