Final answer:
The posterior aspect or dorsal body cavity is located at the back of the body and includes the head and the back of the trunk.
Step-by-step explanation:
The posterior aspect, also known as the dorsal body cavity, is located at the back of the body and includes both the head and the back of the trunk.
It is subdivided into two parts: the cranial cavity, which houses the brain, and the spinal cavity, which encloses the spinal cord.
The brain and spinal cord are protected by the bones of the skull and vertebral column and by cerebrospinal fluid, which cushions them within the posterior cavity.