PONS

INTRODUCTION

• Pons means bridge. It is 2.5cm long.

• Connects Medulla Oblongata with Mid brain

• Has Two surfaces

• Anterior surface convex and is formed of transversely running fibers

• Groove for basilar artery lies in centre

CONNECTION WITH CEREBELLUM

• Connected to cerebellum with middle crebellar peduncle

• Formed of fibers emerging from pontine nuclei.

ANTERIOR SURFACE

• Trigeminal nerve emerges from anterior surface

• Emergence marks transition of transverse fibers of Pons to middle cerebellar peduncle.

• Motor root medial and larger sensory root placed laterally

CRANIAL NERVES

• At junction of PONS and MEDULLA there is emergence of VI ,VII ,VIII nerves

Pons serves as a relay station providing connection between cerebral cortex and cerebellum

POSTERIOR SURFACE

• Formed by floor of 4th ventricle

• Contains tracts and nuclei of cranial nerves

• Triangular in shape

• Limited laterally by Superior Cerebellar Peduncle

FEATURES

• Median Sulcus

• Medial Eminence

• Sulcus Limitans

• Facial colliculus

• Substantia Ferrugenia

• Area Vestibuli