Neurosonography Part Three Harry H. Holdorf

Slides:



Advertisements
Similar presentations
MRI of the Thoracic Spine: Axial T1 wtd.images.
Advertisements

Anatomy of the Cerebral Ventricles
Chapter 7 Structural Overview of Major Brain Regions
Meninges and CSF Dr. K. Sivapalan.
The Nervous System - Lab Exercise 5
BRAIN STEM EXTERNAL FEATURES Dr. Ahmed Fathalla Ibrahim.
BIO 210 Lab Instructor: Dr. Rebecca Clarke
Ventricles and Meninges
Meninges ,ventricles & CSF
Chapter 7 : The Nervous System Central Nervous System, Anatomy.
NEUROANATOMY Lecture : 6 The Ventricles and Meninges of the Brain,
Meninges ventricles & CSF
CSF and Ventricular System
The Central Nervous System
Dr. Yaser Abdulghani AlQasimi, MBBS Radiology Demonstrator, KAU
By Prof. Saeed Abuel Makarem 1Prof. Makarem. BRAIN VENTRICLES The brain is bathed by the cerebrospinal fluid (CSF) Inside the brain, there are spaces.
Gross Brain Overview: Part II Basic Neuroscience James H. Baños, Ph.D.
Ventricles & CSF cisterns
BRAIN. Meninges Cerebrospinal Fluid Function Location Choroid plexus – Circulation.
Gross Brain Overview: Part II Basic Neuroscience James H. Baños, Ph.D.
The Brain and Cranial Nerves Handout #7 Functions of Gray Matter and Handout #8 Cranial Nerves (just location for 3rd test) A. Brain 1. Principal parts.
Meninges, CSF & Ventricular system. Objectives Describe the arrangement of the meninges and their relationship to brain and spinal cord. Explain the occurrence.
The Brain & The Spinal Cord I- The brain: 1- The Meninges: Dura Matter Dura Matter Arachinoid Matter Arachinoid Matter Pia Matter Pia Matter 2- The forebrain.
POSITION & SHAPE It is stalk like in shape. It connects the narrow spinal cord with the expanded fore brain. It is stalk like in shape. It connects the.
Figure 12.1 Embryonic development of the human brain.
Week 10 Central Nervous System The Brain Sheep HumanHuman BrainBrain Brain.
Meninges D.Nimer D.Rania Gabr D.Safaa D.Elsherbiny.
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings.
The Brain Dr Ayman G. Mustafa. CNS = Brain + Spinal cord Brain is divided into 1.Forebrain 2. Midbrain 3. Hindbrain.
Head MR The MedPixMan James G. Smirniotopoulos, M.D.
الاحد 17/11/2013 أ.د.عبد الجبار الحبيطي
Neurosonography Part ONE Harry H
Occlusion of the artery of Adamkiewicz (large medullary artery) could result in infarction of lower thoracic and upper lumbar areas of the.
Meninges ventricles & CSF
Meninges & CSF and Ventricular system
Imaging Anatomy of the CNS
Meninges ,ventricles & CSF
Functions of Major Brain Regions
Meninges, CSF & Ventricular system
Meninges Dr. Nimir Dr. Safaa. Meninges Dr. Nimir Dr. Safaa.
Anatomy of the Brain.
An Introduction to the Brain and Cranial Nerves
The Blood Supply of the Brain and Spinal Cord
Development of the Nervous system
Central Nervous System
Sectional Anatomy of the Brain
GROSS ANATOMY OF THE BRAIN
The Nervous System DR JAMILA EL MEDANY.
Overview of the Brain, Cranial Nerves, Blood Supply and Meninges
a Cerebrum b Cerebellum Left cerebral hemisphere Gyri Sulci
Central Nervous System
The Ventricular System
CENTRAL NERVOUS SYSTEM
Forebrain Domina Petric, MD.
DEVELOPMENT of CEREBRUM & CEREBELLUM.
CENTRAL NERVOUS SYSTEM
Figure 17-1 Embryonic development of the human brain.
Sectional Anatomy Lesson 2 Topic 2 Brain
Central Nervous System
Brain Meninges, Ventricles and CSF
DEVELOPMENT of CEREBRUM & CEREBELLUM
Blood Supply of CNS Prof. K. Sivapalan.
Physiology of spinal cord
Brain.
ANATOMY OF THE MENINGES, CNS CAVITIES & CSF CIRCULATION
DEVELOPMENT of CEREBRUM & CEREBELLUM
Brain stem and Cerebellar Imaging
8 The Nervous System.
Presentation transcript:

Neurosonography Part Three Harry H. Holdorf

Midbrain Smallest portion Between Diencephalon and pons Surrounds Cerebral aqueduct Ventral aspect of midbrain- Cerebral peduncles Dorsal aspect cont. four rounded protuberances; called Corpora quadrigemina or quadrigeminal plate: Upper pair- Superior Colliculi( vis. Pathway) Lower part-Inferior Colliculi ( Auditory pathway)

Pons Band of fibers between midbrain and medulla oblongata. Most of these fibers connect the two halves of the cerebellum to the brain stem by middle cerebral peduncles.

Medulla Oblongata Extends from pons to the foramen magnum Continuous with the spinal cord

Brain Stem

Cerebellum Consist of two Cerebellar hemispheres which are connected by the cerebellar Vermis. Occupy the posterior fossa Located posterior to the pons and medulla oblongata. Attached to the brain by the superior, middle and inferior cerebellar peduncles. The cerebellum is responsible for coordination of the muscular activity and equilibrium.

Cerebellum

Ventericular System, Color pages 80, 82 The Hollow portion of Neural tube becomes ventericular system, which includes: Lateral ventericles Third Ventricle Aquaduct of Sylvius Fourth ventricle

Lateral Ventericules Paired Largest CSF-filled cavities Located in the cerebral hemispheres Each LV consist of: Frontal horn Body Temporal horn Occipital horn Foramen of Monro- connects LV to the 3rd ventricle and divides the FH from the body.

Lateral Ventericules’ Frontal horn In x-sec. is triangular+ concave lat. Wall Roof: Corpus Collasum Medial wall: Cavum Septum Pellucidum Lateral wall: Head of caudate nucleus

Lateral Ventericules’ body Extended from Foramen of Monro back to the trigone In x-sec. view: Crescent with two concavities in the outer margin Roof: Corpus Collasum Medial wall:Cavum Septum Pellucidum Inferior concavity of Lat. Wall: Thalamus Sup. concavity of Lat. Wall: Body of Caudate Nucleus The notch between these stuctures is occupied by: Choroid plexus-posteriorly Thalamostriate vein anteriorly

Lateral Ventericules’ Temporal horn Extend anteriorly from the trigone thru the TL as an arcuate structure It’s concavity is directed medially and inferiorly. Roof: Temporal lobe’s white matter Medial wall: Hippocampus

Lateral Ventericules’ Occiptal horn Extends posteriorly from the trigone Pyramid shaped Medial wall: Occipital cortex+ white matter Proximal roof + Lat. Wall: Corpus collasum Note- Trigone is formed by the junction of the Temporal and Occipital horns.

Third Ventricle Slit-like structure, located at midline Massa Intermedia is a bridge of soft tissue in the 3rd ventricle Lat. Wall: superiorly-Thalami, Inferiorly-hypothalami Floor: Hypothalamus & Optic Chiasma Anterior margin: Lamina terminalis & Ant. Commissure 2 recesses are extending from its anteroinferior aspect: Supraoptic recess & Infundibular recess Extending from its posterosuperior margin: pineal recess Connected to the LVs via foramen of Monro Connected to the fourth ventricle by: Foramen of Magendi or Median Aperature 2 Foramen of Lushchka or Lateral Aperature

Ventericular System cont. Aquaduct of Sylvius: Connects the third and the fourth ventricles Only imaged if there is a massive ventricular enlargement Fourth ventricle: A thin but broad structure Roof: Cerebellar vermis Floor: Medula oblongata

Schematic representation of the cerebral ventricular system Schematic representation of the cerebral ventricular system. Note that lateral ventricles encompass the frontal horns (F.H.), body, posterior horns ( P.H .), and temporal horns (T.H.). The cerebrospinal fluid flows (1) from the lateral ventricles to the third ventricle (closed arrow) via the short foramen of Mono; (2) from the third ventricle through the relatively long aqueduct of Sylvius to the fourth ventricle (open arrow); and (3) from the fourth ventricle through the small foramina Luschka and Magendie to the cisterna magna located posterior to the cerebellum.

sagittal midline MRI image of a normal third-trimester fetal brain sagittal midline MRI image of a normal third-trimester fetal brain. Structures that can be identified include: 4th ventricle (white arrowhead), corpus callosum (small black arrowhead), tectal plate (large black arrowhead), aqueduct of Sylvius (black arrow), and nasopharynx (white arrowhead).

Ventricular system

The blue parts are the ventricular system, while the green part lining the lateral parts of the ventricular system is the caudate nucleus.

Cavum Septum Pellucidum Rumack p. 1637 CSF containing structure Positioned between the frontal horns and bodies of the two LVs This Midline cystic cavity consist of: Anterior portion= Cavum Septum Pellucidum Posterior portion= Cavum Septum Vergae Forms medial walls of LVs From 6th month of gestation CSV begins to close from posterior to anterior as term approaches Prominent landmark in premature and neonates CSP is present in 100% of fetuses, but over 85% of them fuse by 3–6 months of age. These structures normally do not connect with Subarachnoid of ventricular space

Cavum Septum Pellucidum in fetus:

Transverse view of the fetal head which shows the cavum septum pellucidum anterior to the thalamus in fetus:

Cavum Septum Pellucidum in fetus

Sonography of fetal “Agenesis of the corpus callosum”: In the axial plane the interhemispheric fissure (IHF) appears wider than usual without evidence of the cavum septi pellucidum.

Coronal and sagital US images of the CSP in a neonate:

Difference between cavum septum pellucidum (CSP), cavum vergae (CV), and cavum velum interpositi (CVI). 3=third ventricle, 4=fourth ventricle.

Choroid plexus, Rumack p. 1637 Formed by the ependymal lining of ventricles and pia mater Majority found in the Lat. vents, passes thru the foramen of Monro and attaches to the roofs of 3rd and 4th ventricles It’s thin in the temporal horn and body of the Lat. Vents It attaches to the floor of the body of LVs and it’s point of attachment is called Telea Choroidea. In Trigone ; it thickens and forms Glomus. Note- At no time the CP passes into frontal or occipital horns.

Choroid plexus

CSF Circulation Choroid Plexus Produces most of CSF CSF flows through the Foramen of Monro  to the third ventricle through the Aqueduct of Sylvius  to the fourth Vent. It then exit the 4th vent. thought the lateral and median aperatures where it freely communicates with the subarachnoid cisterns and a small portion enters the spinal canal. The main site of passage of CSF into the venous blood is through the arachnoid villi or granulations that project into the dural venous sinuses.

CSF Circulation

CSF Circulation

Cerebral Cisterns Cisterna Magna- Cerebellomedullary cistern Cisterna Pontis or Prepontine cistern Interpeduncular cistern Cistern of the lateral sulcus Cistern of the great cerebral vein or Superior cistern Cisterna Ambiens Quadrigeminal Cistern

Cerebral Cisterns

Germinal Matrix, Rumack p. 1637 Consist of loosely organized sheet of primitive neural cells, richly supplied with poorly supported capillary bed and thin- walled veins which give rise to the neurons and glia of the cerebral cortex and basal ganglia. GM can not be imaged in by either the US or CT.

Germinal Matrix cont. Early in gestation GM forms the entire wall of the ventricular sys. Usually becomes avascular by the 36 weeks of gestation Last area to develop is located in the subependymal region of the caudothalamic notch; above the head of Caudate nucleus Germinal matrix is the site of the vast majority of the SHE (Subependymal hemorrhage)