CORPUS CALLOSUM

CORPUS CALLOSUM
- largest commissure of brain
- connects cerebral cortex of two cerebral hemispheres
- connects all parts of neocortex except lower and anterior parts of temporal lobes
  - connected by anterior commissure
- External Features
  - floor of longitudinal cerebral fissure
    - forms an arched interhemispheric bridge
      - connecting medial surfaces of two cerebral hemispheres
      - forms roof of lateral ventricles
      - lies 4cm behind frontal pole
      - 6cm in front of posterior pole
      - attachments
        
        concave inferior aspect of corpus callosum
        
        attached to
        
        convex superior aspect of fornix
        
        by septum pellucidum
        
        convex superior aspect covered by indusium griseum
        
        embedded in it are medial and lateral longitudinal striae
        
        anterior cerebral vessels usually lie on its superior aspect
        
        covered on each side by cingulate gyrus
        
        separated by callosal sulcus
    - parts
      - rostrum
        
        extends backward and downwards
        
        to join the lamina terminalis
        
        forms floor of anterior horn of lateral ventricle
        
        fibers extend inferiorly to connect
        
        orbital surface of two frontal lobes
      - genu
        
        thick , curved
        
        anterior extremity
        
        4cm behind frontal pole
        
        forms
        
        anterior boundary of anterior horn of lateral ventricle
        
        fibers
        
        curve forwards on either side
        
        in to anterior parts of frontal lobe
        
        forming a fork like structure called
        
        forceps minor ( forceps = fork )
      - trunk / body (middle part )
        
        forms the roof of central part of lateral ventricle
        
        connects
        
        frontal
        
        anterior parts of parietal lobe
      - splenium ( posterior part )
        
        overhangs
        
        thalamic pulvinar
        
        pineal gland
        
        tectum
        
        inferior to splenium
        
        tela choroidea
        
        great cerebral vein of galen
        
        fibers
        
        connect
        
        posterior part of parietal lobe
        
        temporal and occipital
        
        fork like structure
        
        forceps major
    - TAPETUM
      - thin lamina of white fibers
      - roof and lateral wall of posterior horn

1102	Corpus callosum	Corpus callosum
1103	Rostrum	Rostrum
1104	Genu	Genu
1105	Truncus	Truncus
1106	Splenium	Splenium
1107	Indusium griseum	Indusium griseum
1108	Stria longitudinalis lateralis	Lateral longitudinal stria
1109	Stria longitudinalis medialis	Medial longitudinal stria
1110	Radiatio corporis callosi	Radiation of corpus callosum
1111	Forceps minor; forceps frontalis	Minor forceps; frontal forceps
1112	Forceps major; forceps occipitalis	Major forceps; occipital forceps
1113	Tapetum	Tapetum
1114	Lamina terminalis	Lamina terminalis
1115	Organum vasculosum laminae terminalis	Vascular organ of lamina terminalis
1116	Commissura anterior	Anterior commissure
1117	Pars anterior	Anterior part
1118	Pars posterior	Posterior part
1119	Fornix	Fornix
1120	Columna	Columna
1121	Fibrae precommissurales	Precommissural fibres
1122	Fibrae postcommissurales	Postcommissural fibres
1123	Corpus	Body
1124	Crus	Crus
1125	Commissura	Commissure
1126	Taenia fornicis	Taenia
1127	Septum pellucidum	Septum pellucidum
1128	Cavum	Cave
1129	Lamina	Lamina
1130	Nucleus septalis precommissuralis	Precommissural septal nucleus
1131	Nuclei septales	Septal nuclei
1132	Nucleus septalis dorsalis	Dorsal septal nucleus
1133	Nucleus septalis lateralis	Lateral septal nucleus
1134	Nucleus septalis medialis	Medial septal nucleus
1135	Nucleus septofimbrialis	Septofimbrial nucleus
1136	Organum subfornicale	Subfornical organ
1137	Nucleus triangularis	Triangular nucleus