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Eye
► ►
Surface
Skeleton
Eyelids
Lacrimal apparatus
Optic pathway and blood vessels
A. centralis retinae
Tuber cinereum*
A cerebri posterior
Mesencephalon,
Pedunculus
cerebri
Tectum
mesencephali,
Colliculus superior
V. magna cerebri
N opticus [II]
A. ophthalmica
A carotis interna
A choroidea anterior
Tractus opticus
Tractus opticus,
Radix medialis
Tractus opticus,
Radix lateralis
Corpus
geniculatum
mediale
Corpus
geniculatum
laterale
Radiatio optica
Plexus choroideus
ventriculi lateralis
Brachium colliculi superioris
Bulbus oculi
Aa ciliares
R calcarinus
(Area striata)
Sulcus calcarinus
Chiasma opticum
Fig. 663
B rain, Encephalon, and blood supply of the parts of the
optic pathway;
inferior view.
The pituitary gland has been removed at its infundibulum (*]. Due
to the close proximity of the pituitary gland and the optic chiasm,
pituitary tumours can cause visual disturbances.
Optic pathway
1
. neuron: rod cells and cone cells of the retina
2
. neuron: bipolar ganglion cells of the retina (perikarya in
the retinal ganglion)
3. neuron: multi-polar ganglion cells of the retina (perikarya
in the optic ganglion)
The axons of the optic ganglion cells extend primarily to
the lateral geniculate body (lateral root), although several
fibres also extend to the pretectal area and the superior
colliculus (medial root), as well as to the hypothalamus
They run within the optic nerve to the optic chiasm, where
the fibres from the nasal part of the ocular fundus cross
to the opposite side. Each optic tract contains fibres, which
transmit information from the contralateral half of the
visual field.
4- neuron: Its axons travel primarily from the lateral
geniculate body to areas 17 and 18 of the cerebral cortex
(striate area) in the region surrounding the calcarine
sulcus.
