Development

Of

Mesencephalon

Motor nuclei

SE: CN III and CN IV

GVE: Edinger-Westphal nucleus

innervating sphincter pupillary muscles

ALAR PLATE

2 longitudinal elevations seperated by

each other in the midline by a depression

A transverse groove divides these

elevations into superior(ant) and

inferior(post) portions/colliculi

Sup.colliculi

Serve as correlations and centres for visual

reflexes

Inferior colliculi

Serve as relay stations for auditory reflexes

Crus cerebri

Formed by expansion of marginal layer

around the basal plates

Serve as pathways for fibres passing from

cerebal cortex to pons and spinal cord