Upload
sumbul-murtaza
View
445
Download
0
Embed Size (px)
Citation preview
MEHWISH ASLAM RAHEEMI OCCIPITAL LOBE
Posterior most of the brain lobes, associated primarily with vision.
GYRI & SULCI1)No distinguishable gyri.2)Sulci present.i.e Parieto-occipital sulcus separating the
occipital lobe from parietal lobe and the calcarine sulcus (medial surface) extending from the posterior part of corpus callosum up to the occipital pole.
3)Parieto-occipital sulcus makes an acute angle with the calcarine sulcus.
AREAS•PRIMARY VISUAL AREA•SECONDARY VISUAL AREA
PRIMARY VISUAL AREA• Location: Posterior walls of Calcarine sulcus.• Morphology: Thin cortex with striations seen by the
naked eye . Hence, Striated Cortex.• Function: Associated with afferent visual fibers from
the ipsilateral temporal fibers and contralateral nasal fibers through the lateral geniculate body to the PVA.
• Defect/Lesion: Leads to crossed homonymous hemaniopia.
SECONDARY VISUAL CORTEX
• Location: around the Primary visual cortex medially and laterally.• Function: Associates vision with past experience . Helps in Appreciation & Recognition.•Defect/Lesion : Disability to recognize Objects.
OCCIPITAL EYEFIELD• Depends on stimulus.• Involuntary.• Reflex tracking movement• Difference b/w Frontal & Occipital eye field:
The formal is independent of stimulus , voluntary scanning movement.
THANK YOU!