General
- Major commissural connection
- Joins all 4 lobes bilaterally
- C shaped structure
Classification
3 parts (dorsal view)
- Body
- Forceps major
- Arise from Splenium
- interconnect the occipital lobes
- Forms the medial wall of the atrium and occipital horn of the lateral ventricle
- Forceps minor
- Arises from Rostrum
- forms the anterior wall of the frontal horn
- interconnects the frontal lobes
6 parts (from lateral view)
- Anterior
- Rostrum
- Is situated below and forms the floor of the frontal horn.
- A thin tapered white matter
- Forms the floor of the frontal horn and is continuous downward
- Anterior to the anterior commissure where the lamina terminalis is
- Give rise to forceps minor
- Genu
- Wraps around and forms the anterior wall and adjacent part of the roof of the frontal horn.
- Has a large bundle of fibers, the forceps minor, that forms the anterior wall of the frontal horn as it sweeps obliquely forward and lateral to connect the frontal lobes.
- Central
- Body
- The genu and the body of the corpus callosum form the roof of both the frontal horn and the body of the lateral ventricle.
- Posterior
- Splenium
- Contains a large fiber tract, the forceps major, that forms a prominence, called the bulb, in the upper part of the medial wall of the atrium and occipital horn as it sweeps posteriorly to connect the occipital lobes.
- Thick, rounded posterior end
- Is situated dorsal to the pineal body and the upper part of the medial wall of the atrium.
- Give rise to forceps major
- Supplied by
- Splenial artery (or posterior pericallosal artery) arises most commonly from the parieto-occipital branch of the posterior cerebral artery
- Tapetum
- Arises in the posterior part of the body and splenium
- Sweeps laterally and inferiorly
- Forms the roof and lateral wall of the atrium and the temporal and occipital horns.
- Separates the fibers of the optic radiations from the temporal horn and the atrium
- Connect the inferior temporal lobes on both sides
- Supplied by the long penetrating branches of the middle cerebral artery and also by the branches of the posterior cerebral artery around the trigone.
- Ventral radiations
Relations
- Superior
- Medially: forms floor of the longitudinal fissure
- Laterally: cingulum
- Inferior
- Lateral: lateral ventricles
Function
- Interhemispheric transfer
- Contralateral control
Deficit
- Rostrum & genu:
- Asymptomatic
- Anterior body:
- Alien hand syndrome
- Left hand tactile anomia
- Agnosia
- Posterior body
- Lefty hand apraxia
- Left hand agraphia
- Hemispatial neglect
- Splenium
- Binocular vision deficits
- Optic aphasia
- Colour anomia
- Alexia without agraphia (a loss in the ability to communicate through writing)
- Only present with concomitant Lt occipital lobe primary visual cortex injury
- Mutism may be a result of division of the corpus callosum.
- Due to suppression of the limbic system caused by lesions in the
- Anterior cingulate gyrus
- Septum pellucidum
- Fornix
- Other areas of the brain that can be associated with mutism
- thalamus
- basal ganglia
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