Thursday 6 January 2011

internal structure of pons

INTERNAL STRUCTURE OF PONS


UPPER LEVEL



MIDDLE LEVEL




LOWER LEVEL


1)Basillar part(basis pontis),consists of:
                    a)pontine nuclei
                    b)ponto cerebellar fibers
                    c)cortico-pontine fibers
                    d) pyramidal tracts

2)Tegmentum part consists of
             a)Cranial nerve nuclei
                         -Trigeminal nuclei (main sensory and motor nuclei)
                         -Abducent nucleus
                         -Facial nuclei (motor,superior salivary,solitary nuclei)
                         -Vestibular nuclei (superior,medial, and lateral nuclei)
                         -Cochlear nuclei (ventral and dorsal)
             b)Other nuclei
                         -superior olivary nucleus
             c)Tracts
                         -Tectospinal tract
                         -Lemnisci (medial,trigeminal,spinal,and lateral)
            d)Medial longitudinal bundle/fasciculus


BLOOD SUPPLY

     Arteial .Supply      : pontine br. of the basilar art
     Venous drainage   : to inf. petrosal sinuses & the basillar venous plexus

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