Each cerebral hemisphere is further divided in to Frontal,Parietal,Temporal and Occipital lobes by fissures
BRAIN ANATOMY
Sagittal surface
Thalamus Lat vent
Pons: divided in to tectum and
tegmentum Connects mid brain to medulla
Medulla:continues as spinal cord
Contains ascending and descending Spinal tracts
Cerebellum
Inferior surface
Interhemispheric fissure
Temporal lobe Mammillary bodies
FrontalБайду номын сангаасlobe
Olfactory tract
Optic tract Pit. stalk pons
Medulla oblongata Cerebellum Vermis
Vertebral As:- two Vertebral as join to form Basilar A
Branches: Ant inf cerebellar A
Sup cerebellar A Pontine As & labyrinthine As Post cerebral A
Contd….
Divided into supra tentorial and infra tentorial compartments containing:-
Supratentorium: Cerebral hemispheres diencephalon
Infratentorium: Brain stem structures cerebellum
CT AND MRI IMAGING
OF NORMAL BRAIN
NORMAL ANATOMY OF BRAIN
Brain is separated from calvarium by three meninges-dura mater,arachnoid membrane and pia mater.
ii. Sup.colliculi
iii. Inf. Colliculi
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iv. Aqueduct of sylvius
v. Midbrain
vi. Cerebellum
vii. 4th ventricle
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viii.Pons
ix. Oculomotor n
x. Inter thalamic commissure
Divides into cortical and perforating A Perforating As supply Basal ganglia,Thalami, internal capsule Thalamus:-Perforating br of PCA Internal cap:-Med& lat striate br of MCA,recurrent br
Ventricles of brain
Lateral ventricle:-C shaped cavity with body in the parietal lobe and extensions in the frontal temporal,occipital lobes Connected to third ventricle by foramen of monro. Third ventricle:-lies b/w two thalami.connected to fourth ventricle by cerebral aqueduct. Fourth ventricle:-lies in the cerebellum CSF Flow:-Lat.vent->foramen of monro->3rd vent>cerebral aqueduct->4th vent->foramen of magindie and luschka->sub arachnoid space > finally absorbed by the arachnoid granulations
Ventricles of brain
Blood supply of the brain
Blood supply of the brain
By Internal Carotid and Vertebral A Internal carotid A: Middle cerebral A
Ant cerebral A Post. communicating A Ant. Choroidal A
• Divided into two hemispheres by falx cerebelli
• Connected in the midline by a worm like structure Vermis
• Divided into • I. Anterior lobe • ii. Middle lobe • Iii. Flocculo-nodular lobe
Brain stem structures
Mid brain: divided into Cere
bral peduncles and colliculi. Sup colliculi attached to med. Geniculate & Inf to lateral Geniculate body Surrounded by Perimesencephalic cistern.
Genu
Fornix Pituitary gland
Mid brain Pons Medulla
Cingulate gyrus Quadrigeminal cistern
Splenium Colliculi
4th vent Cerebellum
Sagittal surface
i. Pineal gland