CSF LIQUID MEDIUM WHICH SURROUNDS THE CNS CLEAR

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CSF Ø LIQUID MEDIUM WHICH SURROUNDS THE CNS Ø CLEAR, ODOURLESS Ø FOUND IN

CSF Ø LIQUID MEDIUM WHICH SURROUNDS THE CNS Ø CLEAR, ODOURLESS Ø FOUND IN THE SAS, VENTRICULAR SYS & CENTRAL CANAL OF S. CORD Ø FXNS ? l BUOYANCY, PROTECTION, METBOLIC EXCHANGE

FORMATION Ø 70% BY CHOROID PLEXUS l THRO’ SECRETN, (TUFT OF CAPILLARIES IN CT

FORMATION Ø 70% BY CHOROID PLEXUS l THRO’ SECRETN, (TUFT OF CAPILLARIES IN CT STROMA COVERED BY CUBOIDAL EOENDYMA IN THE VENTRICLES) 12% THRO’ METABOLISM Ø 18% BY CAPILLARIES Ø ABT 140 MLS Ø 25 MLS IN VENTRICLES Ø 400 -500 PRODUCED /DAY Ø CONTAINS Ø l H 2 O, A. AS, GLUCOSE, INORGANIC IONS

ANTERIOR HORN OF LAT. VENTRICLE n ANTERIOR TO CENTRAL PART START at level of

ANTERIOR HORN OF LAT. VENTRICLE n ANTERIOR TO CENTRAL PART START at level of interventricular foramen n n EXTENDS TO F. LOBE HAS-ROOF, FLOOR & MEDIAL WALL IT IS CLOSED ANT. BY THE GENU OF C. CALLOSUM FLOOR-ROSTRUM OF C. CALLOSUM & C. NUCLEUS

VENRICULAR SYSTEM CAVITIES INSIDE THE BRAIN CONTAINING CSF n LATERAL VENTRCLES n n 3

VENRICULAR SYSTEM CAVITIES INSIDE THE BRAIN CONTAINING CSF n LATERAL VENTRCLES n n 3 RD VENTRICLE n n CEREBRAL HEMISPHERES DIENCEPHALON 4 TH VENTRICLE n RHOBENCEPHALON

LATERAL VENTRICLE n n n 1 IN EACH C. HEMISPHERE LNKED BY INTERVENTRICULAR FORAMEN

LATERAL VENTRICLE n n n 1 IN EACH C. HEMISPHERE LNKED BY INTERVENTRICULAR FORAMEN ESSENTIALLY A CENTRAL PART AND 3 EXTENSIONS -HORNS n n n ANTERIOR HORN POSTERIOR HORN INFERIOR HORM

CENTAL PART n TRIAGULAR IN CROSS SECTION – WITH n ROOF – TRUNK OF

CENTAL PART n TRIAGULAR IN CROSS SECTION – WITH n ROOF – TRUNK OF C. CALLOSUM n MEDIAL WALL – S. PELLUCIDUM, BODY OF FORNIX n FLOOR – SUP. SURFACE THALAMUS, C. NUCLEUS, STRIAE TERMINALIS, THALAMOSTR IATE VEIN. OF LATERAL VENTRCLE

POSTERIOR HORNOF LAT. VENTRICLE n n EXTENDS BACKWARD OF TO OCC. LOBE. HAS A

POSTERIOR HORNOF LAT. VENTRICLE n n EXTENDS BACKWARD OF TO OCC. LOBE. HAS A ROOF, LAT. WALL & MEDIAL WALL ROOF & LAT. WALL MEDIAL WALL SHOWS 2 ELEVATIONS – UPPER-BULB OF POST. WALL(PDCED BY FIBERS OF FORCEPS MAJOR) – LOWER- CALCAR AVIS (WHITE MATTER PUSHED IN BY CALCRINE SULCUS)

INFERIOR HORNOF LAT. VENTRICLE n n RUNS FORWARDS & DOWNWARDS INTO TEMPORAL LOBE HAS

INFERIOR HORNOF LAT. VENTRICLE n n RUNS FORWARDS & DOWNWARDS INTO TEMPORAL LOBE HAS A ROOF & FLOOR

3 RD VENTRICLE CAVITY OF DIENCEPHALON n COMMUNICTES WT THE LAT VENTRICLE THRO’ THE

3 RD VENTRICLE CAVITY OF DIENCEPHALON n COMMUNICTES WT THE LAT VENTRICLE THRO’ THE INTERVENRICULAR FORAMEN n CONTINUES POST. AS THE C. AQUEDUCT WHICH CONNECTS WT THE 4 TH VENTRICLE n SITUATED IN THE MEDIAN PLANEHAS 2 LAT. WALLS, ANT & POST. WALLS A ROOF AND A FLOOR O. CHIASMA, T. CINERIUM, INFUNDIBULUM, POST. PERFORATED SUBS. & TEGMENTUM n Ependyma

4 TH VENTRICLE n n CAVITY OF RHOBENCEPHALON HAS A CAVITY WITH MULTIPLE RECESSES

4 TH VENTRICLE n n CAVITY OF RHOBENCEPHALON HAS A CAVITY WITH MULTIPLE RECESSES LIES BEHIND PONS AND MEDULLA FLOOR IS CALLED RHOMBOID FOSSA

RHOMBOID FOSSA (FLOOR OF THE 4 TH VENTRICLE n n DIVISIBLE INTO 2 TRIANGULAR

RHOMBOID FOSSA (FLOOR OF THE 4 TH VENTRICLE n n DIVISIBLE INTO 2 TRIANGULAR PARTS INTERMEDIATE PORTION MARKED BY TRANSVERSELY RUNNING FIBERSSTRIAE MEDULLARES n /DED INTO RT & LT BY THE MEDIAN SULCUS

CIRCULATION OF CSF § LAT. VENTRICLES THRO’ I-V FORAMEN 3 RD VENT § 3

CIRCULATION OF CSF § LAT. VENTRICLES THRO’ I-V FORAMEN 3 RD VENT § 3 RD VENT THRO’ AQUEDUCT – 4 TH VENT. § INTO SAS THRO’ FORAINA OF MENGEDIE & LUSCHA