GENERAL HISTOLOGY

Detailed explanation-1: -The top portion of the brainstem is called the midbrain. The midbrain is a small portion of the brain stem located at the top of the brain stem. Just below the midbrain is the pons, and below the pons is the medulla. The medulla is the part of the brain stem closest to the spinal cord.

Detailed explanation-2: -The diencephalon is the region of the embryonic vertebrate neural tube that gives rise to anterior forebrain structures including the thalamus, hypothalamus, posterior portion of the pituitary gland, and the pineal gland. The diencephalon encloses a cavity called the third ventricle.

Detailed explanation-3: -The midbrain serves as the connection between the pons and the diencephalon. It also connects posteriorly to the cerebellum via the superior cerebellar peduncles. The anterior part of the midbrain contains the crus cerebri with the interpeduncular fossa located between them.