Corpus Callosum

• It is the connective pathway between the left and the right side of the brain.
• It is responsible for transmitting neural messages between both the hemispheres
• The corpus callosum sits in the centre of the brain, measures around 10 cm in length and is shaped like the letter C

1.Genu:

• It is the anterior end, lies 4 cm behind frontal pole
• Relations:
  • Anteriorly-anterior cerebral arteries
  • Posteriorly-anterior horn of lateral ventricle.

2.Rostrum–

• Directed downwards and backwards from genu
• Ends by joining lamina terminalis, in front of anterior commissure 
• Relations:
  • Superiorly-anterior horn of lateral ventricle
  • Inferiorly-indusium griseum and longitudinal striae

3. Trunk

•  Middle part between genu and splenium

•   Forms roof of central part of lateral ventricle

• Relations:

  •  Superior surface

    • anterior cerebral arteries

    • Lower border of falx cerebri

    • Overlapped by cingulate gyrus and covered by  Indusium griseum, longitudinal striae.

  • Inferior surface:

    • provides attachment to septum pellucidum, fornix

4.Splenium

•  Post. end (thickest part of cc), lies 6 cm in front of occipital pole
• Relations

  •  Inferior surface

    • Tela choroidea of the third ventricle, the     pulvinar, the tectum, the pineal body

  • Superior surface

    • Inferior sagittal sinus and falx cerebri

  • Posteriorly

    • Great cerebral vein, straight sinus and free margin of tentorium cerebelli

 1.Rostrum

•  Connects orbital surfaces of two frontal lobes

 2.Forceps minor

•  Made of fibres of genu
• Connects two frontal lobes

3.Forceps major

•  Made of fibres of splenium
• Connects the two occipital lobes

 4.Tapetum

•  Made by some fibres from trunk and splenium
• Forms the  roof and lateral wallof posterior horn and lateral wall of inferior horn of  lateral ventricle

Agenesis of corpus callosum

• It is a congenital (lifelong) brain abnormality that occurs when the corpus callosum does not develop as it should during the early prenatal period.
• It can occur as an isolated condition or in association with other brain abnormalities or physical or medical condition.