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