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Ventricles and Choroid Plexus

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TERMINOLOGY

Definitions

• Tela choroidea: Double layer of pia, formed during folding of brain where hemispheres overgrow diencephalon & cerebellum apposes dorsal brainstem
• Choroidal fissure: Narrow, pial-lined channel between subarachnoid space (SAS) & ventricles; site of attachment of choroid plexus in lateral ventricles

GROSS ANATOMY

Overview

• Cerebral ventricles

4 CSF-filled, ependymal-lined cavities deep within brain

Paired lateral, midline 3rd & 4th ventricles

Communicate with each other as well as central canal of spinal cord, SAS
• Choroid plexus

Secretory epithelium that produces CSF

Choroid plexus forms where tela choroidea contacts ependymal lining of ventricles: Roof of 3rd ventricle, body & temporal horn of lateral ventricle via choroidal fissure, inferior roof of 4th ventricle

CSF flows from lateral ventricles through foramen of Monro into 3rd ventricle, through cerebral aqueduct into 4th ventricle; exits through foramina of Luschka & Magendie to SAS

Bulk of CSF resorption through arachnoid granulations in region of superior sagittal sinus

Anatomy Relationships

• Lateral ventricles

Each has body, atrium, 3 horns

Frontal horn formed by

– Roof: Corpus callosum

– Lateral wall, floor: Caudate nucleus

– Medial wall: Septum pellucidum (thin midline structure that separates right, left frontal horns)

Body formed by

– Roof: Corpus callosum

– Floor: Dorsal surface of thalamus

– Medial wall, floor: Fornix

– Lateral wall, floor: Body, tail of caudate nucleus

Temporal horn formed by

– Roof: Tail of caudate nucleus

– Medial wall, floor: Hippocampus

– Lateral wall: Geniculocalcarine tract, arcuate fasciculus

Occipital horn : Surrounded by white matter (forceps major of corpus callosum, geniculocalcarine tract)

Atrium : Confluence of horns; contains glomi of choroid plexus

Lateral ventricles communicate with each other, 3rd ventricle via Y-shaped foramen of Monro
• 3rd ventricle

Midline, slit-like vertical cavity between right, left diencephalon that contains interthalamic adhesion (not true commissure)

Borders

– Anterior: Lamina terminalis, anterior commissure

– Lateral: Thalami

– Roof: Tela choroidea, choroid plexus

– Floor: Optic chiasm, infundibulum & tuber cinereum, mammillary bodies, posterior perforated substance, tegmentum of midbrain

– Posterior: Pineal gland, habenular & posterior commissures

Recesses

– Inferior: Optic, infundibular

– Posterior: Suprapineal, pineal

Communicates with 4th ventricle via cerebral aqueduct
• 4th ventricle

Diamond-shaped cavity (rhomboid fossa) along dorsal pons & upper medulla

Borders

– Roof: Tent-shaped, covered by anterior (superior) medullary velum above & inferior medullary velum below

– Walls: Dorsal surface of pons & medulla, cerebral peduncles (superior/middle/inferior)

5 recesses

– Paired posterior superior: Thin, flat pouch capping tonsils

– Paired lateral: Curve anteriorly under brachium pontis, contain choroid plexus, communicate with SAS via foramina of Luschka

– Fastigium: Blind-ending, dorsally pointed midline outpouching from body of 4th ventricle

Communicates with SAS via foramina of Magendie & Luschka, with central canal of cord via obex

IMAGING ANATOMY

Overview

• Lateral ventricles: Paired, C-shaped, curve posteriorly from temporal horns, arch around/above thalami
• 3rd ventricle: Thin, usually slit-like; 80% have central adhesion between thalami (massa intermedia)

Recesses: Optic is rounded, superior to optic chiasm; infundibular is pointed, extends inferiorly into infundibular stalk; suprapineal is thin, extends over pineal; pineal is pointed projecting into pineal stalk

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Mar 13, 2021 | Posted by admin in NUCLEAR MEDICINE | Comments Off

Main Text

TERMINOLOGY

Definitions

GROSS ANATOMY

Overview

IMAGING ANATOMY

Overview

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Ventricles and Choroid Plexus

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Ventricles and Choroid Plexus

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