Muscles of arm (table 9-1). The muscles of the anterior arm are the biceps, coracobrachialis, and brachialis. They are supplied by the musculocutaneous nerve. The triceps is the muscle of the posterior arm, and it is supplied by the radial nerve.he muscles of the anterior arm are the biceps, coracobrachialis, and brachialis. They are supplied by the musculocutaneous nerve. The triceps is the muscle of the posterior arm, and it is supplied by the radial nerve.
1 Based on analysis on US median household income, median household money income during the 2006-2012 period had an average (but not median) of $53,836, therefore by comparison the Gallup result is underreported and is even below the Census' own figures.
U.S. Average Income Isn't Keeping Up. Current real median household income of $56,516 is still lower than the record $70,057 in 2007. It's also 5.1 percent lower than the $69,741 made in 2000. The table below compares the change in income through the 2000 and 2008 recessions.