A. External features of the brain.
1.Cerebral hemisphere. On its dossolateral surface the central
sulcus, and lateral and parieto-occipital fissure, the frontal,
parietal, parietal, temporal and occipital lobes are shown; On its
median and basal surfaces the corpus callosum(cutting surface),the
parietoocipital and calcarine fissures, the olfactory bulb and
tract are shown.
2.Brain stem. On its dorsal aspect the thalamus, pulvinar corpora
quadrigemina and the rhomboid fossa are shown; On its ventral side,
teh optic chiasma, mammilary bodies, crura pedunculi and pons etc.
3.Cerebellum.Special features of cerebellar hemispheres and vermis
B. The arterial supply of the brain
1. Sources:2 vertebral, 2internal carotid arteries.
2. Right and left vertebral arteries passing forwards on the
ventral surface of medulla oblongata, unite at lower border of
pons. Balilar artery after giving off a pair of superior cerebellar
arteries divides into posterior cerebral arteries. Posterior
cerebral connected with internal right and left carotid arteries by
post communicating branches. The internal carotid gives off the
middle and anterior cerebral arteries.
3. Arteria supply of the cerebellum and cerebrum.
1) The cerebellum supplied by 3pairs of
a. Post inferior cerebellar arteries arising from verterbral
b. Anterior inferior cerebellar arteries originating from basilar
artery at lower border of pons.
c. Superior cerebellar arteries arising from basilar artery at
superior border of pons.
2) The cerebrum, supplied mainly by 3 pairs of cerebral arteries.
a. The posterior cerebral arteries, terminal branches of the
b. The middle cerebral arteries to stem of lateral fissure,
supplying main part of dorsal lateral surface of brain.
c. The anterior cerebral arteries are terminal branches of internal
carotid arteries to medial surface of the cerebral hemisphere. (The
vessel passing along the groove between dorsal surface of thalamus
and caudate nucleus is a vein, .... vena terminalis).