The GCL + IPL thickness measurement is useful for detecting the characteristic RGC loss caused by optic tract
The adult brain divided into three main parts: the hind brain (Medulla oblongata, Cerebellum), the midbrain (Peduncles of the cerebrum, Optic lobes), and the forebrain (Thalamus, Pineal body, Hypophysis, Optic tracts
and chiasm, Cerebral hemispheres, Olfactory lobes)
Rupture of intra cranial aneurysm--since the circle of Willis is closely related to optic chiasma, optic tracts
, these rupture giving rise to characteristic visual field defects
Robinson, "Anatomical connections of the primate pretectal nucleus of the optic tract
," Journal of Comparative Neurology, vol.
If a RAPD is observed (also known as a Marcus Gunn pupil), it indicates asymmetrical (bilateral symmetrical damage does not produce RAPD) retinal, optic nerve or optic tract
damage, although post-chiasmic lesions rarely produce a clinically detectable RAPD.
(c) Pure optic tract
or LGN lesions are relatively common.
However, the pupil response is both slowed and reduced in patients with hemianopia due to optic tract
damage, (21) and in those with homonymous hemianopia as a result of stroke affecting the occipital lobe.
MR Imaging Study of Edema-Like Change along the Optic Tract
in Patients with Pituitary Region Tumors.
(iv) Optic tracts
: they transfer the information from the retina to the visual cortex of the brain [23, 24].
Posterior visual pathways include optic tracts
, lateral geniculate body, optic radiation and occipital cortex.
Tumours may be unilateral or bilateral, affecting the optic nerves, optic tracts
Posterior involvement of the optic tracts
and radiation and lateral geniculate body is less commonly seen.