There is an unpaired bone located at the base of the skull called the sphenoid bone. This bone is located in front of the temporal and occipital bones of the skull. There are seven bones that form the orbit (eye socket), and the sphenoid is one of these bones.
The shape of the sphenoid bone resembles a butterfly. There are two greater and lesser areas of the bone. These sections are called wings. Below the sphenoid bone, two parts of the bone stick out, called the pterygoid processes. Two other bones, the sphenoidal conchae, are located at the front and back sections of the body.
The pituitary gland, which produces many different hormones that control other glands, is housed in the sphenoid bone in the median section. It is also housed in the sella turcica.
In other animals, the sphenoid bones are often separate; however, in humans they are merged together.