Presence of a foramen for an artery is a characteristic of which bone?

Which one of the following vertebrae of the rabbit has a long and backwardly directed neural spine?

In the first two or three lumbar vertebrae,there is a small median process below the centrum; this is called:

Bones are primarily composed of which elements?

The pelvic girdle of birds is attached to a complex structure formed by the fusion of the last thoracic,all lumbar,and the first few caudal vertebrae. This structure is called:

Which of the following is not a function of the endoskeleton?