The optic tract The optic tract 

1. The optic tract
Presented by
Dr Pashmina
Khan

2. The optic tract
 The axons of the retinal ganglion
cells converge to form the optic
nerve, which after a partial
decussation at the optic chiasm
forms the optic tract.
 The optic tract arises from the
optic chiasm, which lies in the
subarachnoid space above
the pituitary gland

3. The optic tract
 optic tract contains the fibres from
the ipsilateraltemporal and contralateral nasal
retina.
 the right optic tract contains fibres from the
right halves of the right and left retinae, and
the left optic tract from the left halves of the
right and left retinae of the eyeballs
ensuring bilateral vision

4. The optic tract
 The optic tract is an
important part of
the visual pathway.
transmits visual
impulses from the
retina to the LGB
and from the LGB to
the primary visual
cortex(area 17) of
the occipital lobe.

5. The optic tract

6. The optic tract
 Most of the optic tract fibres synapse in
the lateral geniculate body
 The optic radiation, also known as
the geniculo-calcarine tract, is a relay
centre receiving about 80% of the optic
tract. The remaining fibres of the optic
tract terminate in the pretectal nuclei and
superior colliculus.

7. The optic tract
 receives its blood
supply from the
posterior
communicating
artery and the
anterior choroidal
artery.
 The venous
drainage is from
the superior aspect
through
the anterior
cerebral veins and
from the inferior
aspect through
the basal vein.

8. the optic tract
 A lesion of the optic tract
may lead to
homonymous
hemianopia.
 on in one half (right or
left) of the visual field is
called hemianopia. If
the same half of the
visual field is lost in both
eyes the defect is said to
be homonymous,

9. Any question