What type of bone is described as dense and compact, with an outer periphery that has no visible spaces?

The type of bone described as dense and compact, with an outer periphery that has no visible spaces, is cortical bone. This type of bone is primarily found in the shafts of long bones and is responsible for providing strength and support to the skeletal structure. The dense composition allows it to withstand significant physical stress and provides an outer layer of protection for the inner, more porous structures of bone, such as cancellous bone.

Cortical bone has a tightly packed structure that minimizes the presence of spaces, contributing to its overall strength and rigidity. It plays a crucial role in supporting weight and enabling movement, which is essential for various physical activities. Its properties distinguish it from other types of bone, such as cancellous bone, which is characterized by a sponge-like appearance with numerous spaces and is typically found at the ends of long bones and in the interiors of others.

By focusing on the characteristics of cortical bone, including its dense, compact nature and lack of visible spaces, the choice accurately aligns with the description provided in the question.