11. Crinoids are supported by jointed stalks containing substantial compound ossicles . 12. The arms contain columns of well-developed vertebrae-like ossicles . 13. The middle-ear ossicles further amplify the vibration pressure roughly 20 times. 14. The three ossicles transmit sound from the outer ear to the inner ear. 15. Several ribs were also found with these ossicles attached. 16. Just below their skin is an endoskeleton composed of calcareous plates or ossicles . 17. There are no ossicles present over the neural spines, unlike in hupehsuchians. 18. The stapes is the third bone of the three ossicles in the middle ear. 19. Vibrations that contact the tympanic membrane travel through the three ossicles and into the inner ear. 20. Anterior to the ossicles lie further muscles, contraction of which cause the introvert to retract.
