male human quadracep muscle anatomy. 3d

ribsanatomy ribs consists pairs curve chest provide protection heart lungs vital organs shaft curved articulates thoracic vertebrae spine long thin curves attached sternum breastbone front back costal cartilage indirectly sharing common piece skelribs skeleton illustrationqua illustrationquad qanatomy quaanatomy quadracep muscle quadriceps femoris quads large located primary extensor knee essential walking running jumping lower body composed four distinct heads rectus superficial muscles middle originates