Dr. Rima Pathak. Gross Anatomy Main Sulci & Gyri.
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Transcript of Dr. Rima Pathak. Gross Anatomy Main Sulci & Gyri.
Dr. Rima Pathak
Gross Anatomy
Main Sulci & Gyri
Cingulate
Central
Parieto Occipital
Postcentral gyrus
Cingulate
Thalamus
Caudate
Mid brain
4th ventricle
Pons
Inf Cerebellum
medulla
Spinal cord
Sella
Infundibular stalk
Precentral gyrus
Premotor area 6
Superior frontal gyrus
Pineal gland
Cingulate
Sylvian
Sup & middle Temporal
Median longitudinal fissure
Sup. Frontal
Inf. Frontal
Cingulate gyrus
Corpus callosum
Septum pellucidum
3rd Ventricle
Sup temporal gyrus
hippocampus
Internal Carotid A
Middle Frontal Gyrus
Inf Frontal Gyrus
Insular cortex
Inf Temporal Gyrus
Transverse Sinus
Formation of Basilar artery
Inf. Temporal gyrus
Internal carotid artery
Nasopharynx
Ethmoid air cells
lens
Eye ball
Optic nerve
Temporal horn of lat ventricle
Inf pons
Vermis
Parieto occipital sulcus
# Frontal LobeFalx cerebri
Caudate
Putamen
Choroid plexus
Splenium of corpus callosum
4th Ventricle
Thalamus & 3rd Ventricle
The Cerebral HemispheresCentral sulcus (of Rolando)Lateral sulcus (of Sylvius); Parietooccipital sulcus; Calcarine sulcus. Preoccipital notch
divide each
cerebral hemisphere
Frontal Lobe Anterior tip of the
brain (the frontal pole) to the central sulcus.
Inferiorly lateral sulcus/ Sylvian Fissure.
Medially extends anterior to an imaginary line from the top of the central sulcus to the corpus callosum.
AttentionBehavior, Abstract thinking,Problem solving, Creative thought, Emotion, Intellect, Initiative, Judgment, Coordinated movements, Muscle movements, smell, Physical reactions, and Personality.
Broca's Area opercular and triangular sections of the inferior frontal gyrus. Expressive language, speech. Damage .Sparse Relevant Speech/Low word output.
Parietal Lobe Anteriorly Central sulcus to an imaginary line
connecting the top of the parietooccipital sulcus and the preoccipital notch.
Inferiorly it is bounded by the lateral sulcus and the imaginary continuation of this sulcus to the posterior boundary of the parietal lobe.
Medially surface, it is bounded posteriorly by the corpus callosum and calcarine sulcus, anteriorly by the frontal lobe
Posterior by the parietooccipital sulcus.
four anatomical boundaries:the central sulcusthe parieto-occipital sulcusthe lateral sulcus (sylvian fissure)the medial longitudinal fissure the two hemispheres.
Sensory cortex is located in the front part of the parietal lobe. Receives information from the spinal cord about the sense of touch, pressure, pain, and the perception of the position of body parts and their movements.
Fissure of Rolando (central sulcus) to the parieto-occipital fissure behind. Below, it is limited anteriorly by the fissure of Sylvius, while its posterior portion merges into the temporosphenoidal lobe.
Temporal lobeSuperiorly: to the lateral sulcus and the line
forming the inferior boundary of the parietal lobePosteriorly: it extends to the line connecting the top
of the parietooccipital sulcus and the preoccipital notch.
Medial surface: its posterior boundary is an imaginary line from the preoccipital notch to the splenium of the corpus callosum.
Functions include comprehension, naming, verbal memory and other language functions. Sound processing is controlled by the temporal lobes- in the Broca’s area and Wernicke’s area.
The underside (ventral) part high-level visual processing of complex stimuli such as faces (fusiform gyrus) and scenes (parahippocampal gyrus) object perception and recognition.
The medial temporal lobes (near the Sagittal plane that divides left and right cerebral hemispheres) are thought to be involved in episodic/declarative memory.
The hippocampi seem to be particularly important for memory function - particularly transference from short to long term memory and control of spatial memory and behavior.
Auditory & Visual memories, language, hearing & speech, language, behavior
Wernicke's Area surrounds auditory cortex:understanding & formulating speech. Damage
Verbegeration/ Word salad.
Occipital lobeControls visionhomonomous vision loss
from similarly positioned "field cuts" in each eye.
visual hallucinations. parietal-temporal-occipital
lesions color agnosia, movement agnosia, and agraphia.
BrainstemCerebrum Spinal cord Motor and Sensory pathwaysCardiac and RespiratoryReflexesOriginating in the brainstem 10 of the 12 cranial nerves
Midbriancenter for ocular motionThe tectum (L. roof) of the midbrain consists of
paired lumps, the superior and inferior colliculi (L. small hills).
This is dorsal to the cerebral aqueduct
Ponscoordinating eye and facial movements, facial
sensation, hearing and balance.This consists of: A protruding basal portion, which is oval in the
sagittal section; And the overlying pontine tegmentum, which forms
part of the floor of the 4th ventricle.
Medullabreathing, blood pressure, heart rhythms and
swallowingreticular activating system is found in the midbrain,
pons, medulla and part of the thalamus. It controls levels of wakefulness, enables people to pay attention to their environments, and is involved in sleep patterns
The point of attachment of most cranial nerves
Optic PathwayOptic Chiasm is
located beneath the hypothalamus and is where the optic nerve crosses over to the opposite side of the brain
Cingulate GyrusThis is immediately superior to the corpus callosum. it continues as the parahippocampal gyrus of the
temporal lobe. These 2 gyri give the appearance of encircling the
diencephalon. They, together with the olfactory bulb and tract, and
certain other small cortical areas, are often referred to separately as the limbic lobe (L. limbus, border).
Pituitary Hypothalamus ComplexHypothalamus is a region of the brain in partnership with
the pituitary gland that controls the hormonal processes of the body as well as temperature, mood, hunger, and thirst.
This is inferior to the thalamus. It is separated from it by the hypothalamic sulcus in the wall of the 3rd
ventricle. It also forms the floor of the ventricle. Its inferior surface includes the infundibular stalk and the mammillary
bodies. The hypothalamus is the major visceral control centre of the brain. It is involved in the limbic system as well.
Basal Ganglia
CaudateThe round body bulging into the lateral ventricle and
forming its floor is the caudate nucleus
Thalamuslocated near the center
of the brain and controls input and output to and from the brain
sensation of pain and attention.
borders on the 3rd ventricle. major importance in both sensory and motor systems. The line of attachment of the roof of this ventricle is marked
by a horizontally oriented ridge, the stria medullaris thalami. medial surface of the 2 thalami fuse in many brains called
the interthalamic adhesion or massa intermedia. Posteriorly, the thalamus protrudes over the most rostral
part of the brainstem. Anteriorly, it abuts the interventricular foramen. No sensory information (except olfactory information)
reaches the cerebral cortex without prior processing in the thalami.
anatomical loops characteristic of motor systems, typically involve the thalami .
Putamen & Globus Pallidus
Insular cortexburied in the depths of the lateral
sulcus. It is concealed from view by
portions of the frontal, parietal, and temporal lobes.
The portion of a given lobe overlying the insula is called an operculum (L. lid).
There are frontal, parietal, and temporal opercula.
Pineal Regionon top of the midbrain behind the thalamusPineal Gland controls the response to light and
dark. Its principal hormone melatonin, a derivative of
amino acid tryptophan. stimulated by darkness and inhibited by light.
Follows circadian cycle with peak levels morning.
Hippocampus & Amygdala
Short term memory to long term memory.
The Papez Circuit.Amygdala controls
emotions, social inhibitions, aggression
Cerebellumlower back of the head and is connected to the brain
stem. It is the second largest structure of the brain and is
made up of two hemispheres. The cerebellum controls complex motor functions
such as walking, balance, posture, and general motor coordination
Ventricular SystemFour Ventricles of
the brain are connected cavities within the brain, where cerebrospinal fluid is produced
cavity shown in the septum pellucidum is the so-called fifth ve.ntricle
Lateral VentriclesTwo ventricles enclosed in the cerebral hemispheres
are called the lateral ventricles (first and second). They each communicate with the third ventricle through a separate opening called the Foramen of Munro
Third VentricleThe third ventricle is in the center of the brain, and
its walls are made up of the thalamus and hypothalamus.
The third ventricle connects with the fourth ventricle through a long tube called the Aqueduct of Sylvius.
Fourth VentricleCSF flowing through the
fourth ventricle flows around the brain and spinal cord by passing through another series of openings
Medial Mono MagendieBilateral Lushka
Lateral film
Anterior Film
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Hippocampal atrophy is a highly sensitive indicator of incipient AD. It's evaluation by MRI volumetry provides entirely additional data to support the diagnosis. In contrast, simpler measurements or T2 relaxometry provided only little diagnostic aid. The volume of the hippocampus correlated significantly with clinical severity assessed by MMSE, and with tests assessing delayed recall, which is considered to be affected early in dementia and may reflect hippocampal dysfunction.
2. The volume of the hippocampus is not significantly affected by normal aging.
AAMI can be differentiated from dementia by hippocampal volumetry
Three-Dimensional Fast Spoiled Gradient-Recalled (3D-SPGR) magnetic resonance imaging (MRI)
Standard 1.5 Tesla MRIModified T1 Post ContrastContiguous Sections2mm – 1mm thickness256 x 256 grid