In human anatomy, the deltoid muscle is the muscle forming the rounded contour of the shoulder. Anatomically, it appears to be made up of three distinct sets of fibers though electromyography suggests that it consists of at least seven groups that can be independently coordinated by the central nervous system.
It was previously called the deltoideus (plural deltoidei) and the name is still used by some anatomists. It is called so because it is in the shape of the Greek capital letter delta (Δ). It is also known as the common shoulder muscle, particularly in other animals such as the domestic cat. Deltoid is also further shortened in slang as "delt".
A study of 30 shoulders revealed an average mass of 191.9 grams (6.77 oz) (range 84 grams (3.0 oz)–366 grams (12.9 oz)) in humans.
The deltoid originates in three distinct sets of fibers, often referred to as "heads":
First you gave me love
set my heart on fire
couldn't get enough
many took me higher
walking in the sun
feeling like I can't slow down
Now I'm standing in the dark
looking of the weepers
feelings sad apart
still I can hear your voice call
do I hear my name
I go into the night
Al right I get myself
he's back you just don't care
Only the rain can save me
it's all I have tonight
only the rain can save me
wash away the tears I cried
Now that we're apart
dancing with my shadow
I just bring my part
I have to play it solo
now could lost and found
I don't know where to run and hide
You all have your friends
people you can talk to
I'm just sit and wait
nothing there I can do
but I'm gonna fight
gonna be back no more
I want give up give in
I'm gonna to play and win
Than there come stormy weather into my life
and changing it for the weather