Ventricles of Brain-1

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Ventricles of the Brain 1-The third & The fourth ventricles:

Ventricles of the Brain 1-The third & The fourth ventricles

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Introduction Cavity of Diencephalon Midline Slit like Between Two Thalami & Part of Hypothalamus Lined by ependyma Traversed by inter-thalamic adhesion

Communications :

Communications Anteriorly - With Lateral ventricles through Interventricular foramen of Monro Posteriorly – with fourth ventricle through cerebral aqueduct


Boundaries Lateral Wall Hypothalamic sulcus divides into larger upper part & smaller lower part Large upper part- medial surface of anterior 2/3 rd of thalamus Small posterior part- hypothalamus


Boundaries Anterior Wall Anterior Column of Fornix Anterior Commissure Lamina Terminalis Posterior Wall Pineal Gland Posterior Commissure Beginning of Cerebral Aqueduct


Boundaries Roof Ependyma stretching across two thalami ( striae medullares thalami & Taenia thalmi ) From Interventricular foramen to Habenular commissure Floor Optic Chiasma Tuber Cinerium & Infundibulum Mammillary Bodies Posterior perforated substance Tegnetum of midbrain

Recesses of Third Ventricle:

Recesses of Third Ventricle Infundubular Optic Anterior Suprapineal Pineal

Choroid Plexus & Tela Choridea of Third ventricle:

Choroid Plexus & Tela Choridea of Third ventricle

Clinical Anatomy:

Clinical Anatomy Obstruction Increased ICT in adults Hydrocephalus in Children Use of Ventriculography to detect Tumors –Hypothalamic Syndrome Importance in localizing lesions that deviates it from midline

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Fourth Ventricle


Introduction Tent like cavity of hind brain Placed in posterior cranial fossa between pons & upper part of medulla and cerebellum Triangular in saggital section Rhomboid in horizontal section Continues Below with central canal of medulla Above with cerebral aqueduct


Boundaries Lateral Walls Inferiorly – ICP; Gracile & Cuneate tubercles Superiorly- SCP Roof Upper part- two converging SCP & Superior Medullary Vellum Lower Part - Inferior Medullary Vellum Foramen of Magendie in lower part


Boundaries Floor Upper triangular part Lower triangular Part Intermediate part


Boundaries Features in the Floor Median sulcus Medial Eminence & Sulcus Limitans Vestibular Area Superior Fovea Locus Cerulus & Substantia Ferruginosa Inferior Fovea Facial Colliculus Hypoglossal Triangle Vagal Triangle Taenia & Obex

Features in the Floor :

Features in the Floor

Angles Of Fourth Ventricle:

Angles Of Fourth Ventricle Superior –continuous with cerbral aqueduct Inferior – Continuopus with Central Canal of Closed part of Medulla Two Lateral – One on each side - Across dorsal surface of ICP

Recesses of Fourth Ventricle:

Recesses of Fourth Ventricle Two Lateral Recesses- Reach up to Flocculus Opens into subarachnoid Space of cerebellopontine angles as foramina of Luschka Median Dorsal Recess- Into White Cor of Cerebellum Just above nodules Two Lateral Dorsal Recesses- One on either side of median dorsal recess Projects above inferior medullary vellum

Recesses of Fourth Ventricle:

Recesses of Fourth Ventricle

Tela Choroidea of Fourth Ventricle:

Tela Choroidea of Fourth Ventricle Double Layered fold of Pia Mater between vermis & lower part of roof of fourth ventricle Dorsal Layer lines Inferior vermis & gets reflected upon itself forming Ventral Layer Laterally – continues with Pia Mater covering Cerebellar hemispheres Ventral Layer is Continuous with Pia mater covering dorsal aspect of Medulla

Choroid Plexus of Fourth Ventricle:

Choroid Plexus of Fourth Ventricle Capillary plexus between two layers of Tela Choridea project through lower part of roof forming choroid plexus Derived from branches of posterior inferior cerebellar arteries “ T”Shaped plexus, where vertical limb is double with foramen of Mgendie intervening between two limbs Horizontal Limbs extend through lateral recesses & foraminas of Luschka in to sub- arachnoid space

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