Basically, there is a root. This root makes cells. Those cells die and multiply making your nail longer.
Answer: yes, the syprahyoid muscles are the agonist.
They are the agonists because they elevate the hyoid bone while the antagonists are the infrahyoid muscles, because they do the opposite, they depress the hyoid bone.
The infrahyoid muscles are: the sternohyoid, sternothyroid, thyrohyoid and omohyoid muscle.
Deep inside the medial temporal lobe is the region of the brain known as the limbic system, which includes the hippocampus, the amygdala, the cingulate gyrus, the thalamus, the hypothalamus, the epithalamus, the mammillary body and other organs, many of which are of particular relevance to the processing of memory. :)
