Download Cerebral hemispheres Each of them has

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Transcript 
Cerebrum
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Cerebral hemispheres
• Each of them has:
• 3 poles :
– Frontal, Occipital, Temporal
• 3 Borders :
– Superior, inferomedial & inferolateral
• 3 Surfaces :
– Superolateral, medial & inferior
– Inferior surface : orbital & tentorial
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Defining the lobes
frontal lobe
central (rolandic)
sulcus
parietal lobe
occipital
lobe
temporal lobe
sylvyan (lateral) sulcus
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Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM)
Sulci of medial view
• Cingulate sulcus
• Parieto – occipital sulcus
• Calcarine sulcus
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Sulci of inferior view
• Tentorial portion:
– Collateral sulcus
– Fronto - occipital sulcus
• Orbital portion
– Oribital sulci
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Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM)
© 2005 Elsevier
Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM)
© 2005 Elsevier
Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM)
© 2005 Elsevier
Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM)
© 2005 Elsevier
Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM)
© 2005 Elsevier
Primary Motor Cortex
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Somatic Sensory Cortex
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Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM)
© 2005 Elsevier
© 2005 Elsevier
Brain white mater
• Association fibers:
– Short association fasciculus
– Long association:
• Superior long association fasciculus
• Inferior long association fascculus
• Uncinate (frontotemporal) fasciculus
– Commissural fibers:
–
–
–
–
Corpus callosum
Fornix
Anterior commisure
Posterior commisure
• Projection fibers
– Ascending
– Descending
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Cortical white matter: links with other brain structures
1) Projection fibres: between cortex and subcortical structures
Fibres form: corona radiata (fan-like arrangement),
converge and concentrate to form the internal capsule
2) Commissural fibres: inter-hemispheric connection
• Main system: Corpus callosum (CC)
• Anterior commissure: connects temporal fields
• Hippocampal commissure (Fornix)
3) Association fibres: intra-cortical connections
• short, U-fibres arching beneath adjacent sulci
• long, travel through white matter
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