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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