but skeletal muscles can only exert force by pulling, they cannot push, so moving a joint back and forth requires an antagonistic pair, which is just a fancy way of saying two muscles that pull in ...

In vertebrates, the skeleton of different regions of the body ... which are produced on the back of the embryo and are developmentally closest to the cells of the central nervous system.

Diagnosis of prenatal-onset skeletal dysplasias can be accomplished by ultrasound evaluation and confirmed by both molecular testing using invasive procedures and postdelivery radiographs and ...