GROSS ANATOMY

Detailed explanation-1: -Medula oblongata, the last part of the brain is a triangular structure and continues posteriorly into the spinal cord. Its anterodorsal end bears on either side a hollow outgrowth, the restiform body.

Detailed explanation-2: -Cerebrum controls the voluntary movements of the fish.

Detailed explanation-3: -Scoliodon or dogfish is a cartilaginous fish belonging to the class Chondrichthyes. There are 10 pairs of cranial nerves arising from different parts of the brain and are distributed in the anterior region of the body.

Detailed explanation-4: -The brainstem is the structure that connects the cerebrum of the brain to the spinal cord and cerebellum. It is composed of three sections in descending order: the midbrain, pons, and medulla oblongata.