Which cranial nerves are found in the Midbrain (Mesencephalon)?

A, Optic nerve

B, Oculomotor nerve

C, Trochlear nerve

D, Abducens nerve

More details about midbrain:
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Midbrain:
- Embryologically midbrain arises from second vesicles known as mesencephalon of the neural tube
- It is located below the cerebral cortex and above the hindbrain
- It is the smallest and most superior part of brainstem.
- It measures only 1.5 cm.
- It is divided anterior and posterior section by the Aqueduct of Sylvious ( Connects 3rd and 4rth Ventricles)
- It comprises:
        a) Tectum ( Corpora Quaqrigemina )
        b) Tegmentum
        c) Substantia nigra ( Associated with motor system pathways of the basal ganglia )
        d) Cerebral peduncles
        e) Cranial nerves

• Oculomotor nerve responsible for Eye movements and Pupil constriction (Parasympathetic activity).
• Trochlear nerve comes out from the posterior surface of the midrain just below the inferior colliculus.

RED NUCLEUS

Mnemonics: Structures of the midbrain involves visualizing the mesencephalic cross-section as an upside down bear face:-
"The two red nuclei are the eyes of the bear and the cerebellar peduncles are the ears".

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