pectoantibrachialis, 

pectoralis major, 

pectoralis minor, 

xiphihumeralis all

flexes head

rotates and tilts head toward shoulder

elevates mandible 

jaw closure

elevate hyoid 

raise floor of mouth

O: occipital bone

C7-T12 vertabrae 

I: clavicle 

acromin + spine of scapula

• O: Lateral third of clavicle

  lateral acromion of

  spine of scapula

  I: Deltiod tuberosity on humerious

extends hand 

extension

and pronation of the forarm