2.2: Primate Skeletal Anatomy
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The study of bones is called osteology . It is necessary to have a basic understanding of the skeletal anatomy since the data used in the study of primate and human evolution is based on fossilized bones. The information presented here focuses on the human skeleton. Human beings have an endoskeleton , which means that the skeletal structure is on the inside of the body. The endoskeleton grows along with the rest of the body. Endoskeletons are lighter than exoskeletons (skeletal system on the outside of the body), which allowed for the evolution of large vertebrate animals. The endoskeleton is comprised of bone. Bone has three structural parts:
For the skeletal system to work properly it must have ligaments that connect the bone at the joints, muscles connected to the bones with tendons that allow for movement of the bone, and cartilage that fills the spaces between the bones, preventing them from scraping against one another.
Human infants have 270 bones, several of which fuse together during growth so that adult humans have 206 bones. The skeleton is divided into two categories: the axial skeleton and the appendicular skeleton. The axial skeleton is comprised of the vertebral column, ribs, sternum, and skull.
Figure \(\PageIndex{1}\) - Axial Skeleton
The human skull has a number of bones. These bones were seperate at birth and then fuse together as an individual ages.
Figure \(\PageIndex{2}\) - Human skull bones (simplified)
Figure \(\PageIndex{3}\) - Human skull front bones (simplified)
The appendicular skeleton is composed of the shoulder girdle, upper limbs, pelvic girdle, and the lower limbs.
Figure \(\PageIndex{4}\) - Appendicular Skeleton
Bones function to:
There are four types of bones based on shape.
Bones can also be classified based on their origin and texture, but for the purposes of this class you need only be familiar with the types based on shape.
You should spend some time on the website eSkeletons in order to familiarize yourself with the look of the various bones listed above in the different primates.
Figure \(\PageIndex{5}\) - Human skeleton diagram
Print this blank image to make your own study guide of the human skeleton