Corpus Callosum Fibres: Forceps Minor, Forceps Major, Tapetum, And Rostrum

Corpus Callosum Fibres: Forceps Minor, Forceps Major, Tapetum, And Rostrum

Describe the gross features, relations, blood supply & constituent fibres of corpus callosum (or) Parts of corpus callosum
Answer:

Corpus Callosum:

• It is the largest commissure of the brain
• It connects the two cerebral hemispheres

Gross Features:

• Parts of corpus callosum
  1. Genu
     • It is the anterior end
     • It lies 4 cm behind the frontal pole
  2. Rostrum
     • It is directed downwards & backwards from the genu
  3. Trunk or body
     • It is the middle part between the genu & Splenium
     • Its superior surface is convex from before backwards & concave from side to side
     • Its inferior surface is concave from before backwards & convex from side to side
       Attachments:
     • It provides attachment to the septum pellucidum & the fornix
  4. Splenium
     • It is the posterior end forming the thickest part of the corpus callosum
     • It lies 6 cm in front of the occipital pole

Relations:

Fibres:

1. Forceps minor

• It is made up of fibres of the genu that connect the two frontal lobes

2. Forceps major

• It is made up of fibres of the Splenium connecting the two occipital lobes

3. Tapetum

• It is formed by some fibres from the trunk & Splenium
• It forms the roof & lateral wall of the posterior horn & the lateral wall of the inferior horn of the lateral ventricle

4. The Rostrum connects the orbital surfaces of the two frontal lobes