Final answer:
The medullary cavity and epiphyseal lines are found in long bones, which have a diaphysis and epiphyses at the ends filled with spongy bone and marrow.
Step-by-step explanation:
The shape of bone that contains a medullary cavity and epiphyseal lines is a long bone. Long bones are characterized by having a longer length compared to their width and consist of a shaft known as the diaphysis, which contains the medullary cavity filled with bone marrow.
Each end of a long bone is called the epiphysis, which is filled with spongy bone and red bone marrow. The epiphyseal plate is a layer of cartilage found in growing bones that eventually is replaced by osseous tissue, resulting in an epiphyseal line in adults. Examples of long bones include the femur, tibia, ulna, and radius.