The brain primarily consists of what type of tissue?

The brain is primarily composed of nerve tissue, which is specialized for communication and processing information throughout the body. Nerve tissue includes neurons, the cells responsible for transmitting impulses, and glial cells, which provide support, nourishment, and protection to neurons. This unique composition allows the brain to carry out complex functions such as thinking, memory, and control of bodily movements.

The other tissue types listed do play roles in the body, but they do not define the primary structure of the brain. Connective tissue serves various functions such as supporting organs and connecting different parts of the body, but it is not predominant in the brain. Epithelial tissue forms the surface layers of the body and its organs but lacks the specialized functions associated with the brain. Muscle tissue is involved in movement and contraction but is not a main component of the brain’s architecture. Thus, nerve tissue is essential for the cognitive and sensory processes that are crucial to the brain's role in the nervous system.