Romeo: Surface Anatomy Flashcards
2 parts of forebrain
telencephalon
Diencephalon
midbrain
Mesencephalon
2 parts of Metencephalon
Pons
Cerebellum
parts of hindbrain
metencephalon (pons and cerebellum)
myelencephalon (medulla)
thin gray matter that covers outside surface
where the neurons are
cortical sheet
deep brain structures in center
thalamus and hypothalamus
central core
all the wiring (myelinated axons)
white matter tracts
3 main parts of cerebrum
cortical sheet
central core
white matter tracts
_____ sulcus separates frontal and parietal from temporal lobe
lateral sulcus
sulcus that divides frontal from parietal lobe
central sulcus
primary motor cortex is located in this gyrus
Precentral Gyrus
this gyrus is responsible for mapping the sense of touch from the human body (primary sensory cortex)
Postcentral Gyrus
sulcus that separates parietal from occipital lobe
Parietooccipital sulcus
contains the vision processing center of brain
occipital lobe
2/3rds of cortex is hidden in what
sulci
not a random process and happens in third trimester
Gyrification
_____gyrus deals with object recognition and reading
Fusiform Gyrus
4 main gyri of frontal lobe
superior frontal
middle frontal
inferior frontal
precentral gyrus
3 gyri of parietal lobe
postcentral gyrus
supramarginal gyrus
angular gyrus
3 parts of inferior frontal gyrus
Pars opercularis (1)
Pars triangularis (2)
Pars orbitalis (3)
3 gyri of temporal lobe
superior temporal
middle temporal
inferior temporal
5 main lobes of left lateral surface
frontal
temporal
parietal
occipital
insula
big white matter tract that connects the two hemispheres= forms the roof of lateral ventricle
lateral ventricle sits on top of thalamus
corpus callosum
above corpus callosum that is part of limbic system that is part of processing emotions and behavior regulation
Cingulate
located at the most medial margin of inferior surface of frontal lobe (might be involved in personality); in between olfactory bulbs/nerves
Rectus gyrus
inside sylvian fissure and is triangle shaped
insula
where parts of frontal, parietal, and temporal lobes fold over the insula
Operculum
1st transverse temporal gyri=_________ (primary auditory cortex)
Heschl’s Gyri
Emotional processing
New memory formation
Memory retrieval
Default Mode Network
Limbic system
commonly involved in seizure networks
Limbic system
70% of seizures are ______ lobe seizures
temporal lobe
5 F’s of the limbic system:
Feeding, Fleeing, Fighting, Feeling and… Fornicating, the last one being, really, just a fancy word for Sex
components of limbic system
primarily function to control voluntary movements, initiate motor actions, facilitate motor learning, and contribute to cognitive processes like decision-making, reward processing, and habit formation, with examples including: starting to walk, reaching for an object, learning a new skill like playing piano, evaluating potential risks in a decision, and forming automatic routines like brushing your teeth every morning
basal ganglia
______ DBS is primary target for epilepsy
Anterior nucleus of thalamus (ANT)
Hippocampus —> Fornix —-> Mammillary body—–> MMT —–> Anterior nucleus of thalamus——> Cingulate—–>Hippocampus
Papez’s Circuit
white matter band that runs on top of thalamus and ends in hippocampus (e)
Fornix
Long range cortical connections (connect lobes of brain)
Association Fibers
Short range cortico-cortico connections (same lobe)
U-fibers
Cortical-thalamic/BG connections (cortex to deep brain)
Projection Fibers
Connects hemispheres
Commissural Fibers
Superior Longitudinal Fasciculus (SLF) connects what lobes
frontal-parietal-occipital
Arcuate Fasciculus (AF) connects what lobes
frontal-parietal-temporal
lesion on arcuate fasciculus (broca’s to Wernicke’s)
conduction aphasia
lesion at brocas area
expressive aphasia
lesion at wernickes area
receptive aphasia
Inferior Frontal Occipital Fasciculus (IFOF) connects what lobes
inferior frontal-parietal-occipital
Uncinate Fasciculus (UF) connects what lobes
frontal-temporal
Inferior Longitudinal Fasciculus (ILF) connects what lobes
temporal-occipital
____billions neurons in cortex
20
____ billion neurons in cerebellum
80
cortical sheet made up of how many neurons
20 billion
how many layers in neocortex
6
_____cortex contains limbic structures
Allocortex
___ regions of neocortex (neocortical differences)
52
this area of cortex is found at the Pars triangularis/opercularis (IFG)
Broca’s area
this area of cortex is found at supramarginal/angular gyri
Wernicke’s area
primary visual cortex found here
Calcarine sulcus
posterior temporal cortex (object recognition and reading) found where
Fusiform Gyrus
Largest neurons in brain
Betz cells
R hemisphere receives input from ____ side of body
L
L hemisphere receives input from ___ side of body
R
motor speech area
Involved in speech production
Broca’s area
language development
Speech comprehension
Wernicke’s area
speech functions _______% L hemisphere dominant
90%
L hemispheric stroke= speech _______
not normal
R hemispheric stroke= speech ____
normal
extensive bilateral prefrontal lesions can cause _____ (a lack of inhibition or impulsiveness that can lead to inappropriate actions)
disinhibition
lesions in frontal lobe affect what functions
motor
close eyes and touch both hands at same time, ask which side you touched
if they have neglect, they will only be able to tell you one side (hemibody neglect)
Parietal lesion
finger agnosia, left-right disorientation, acalculia, and agraphia (angular gyrus of parietal lobe lesion)
Gerstmann’s syndrome
lesion in temporal lobe (amygdala) affects what
memory
specific brain region primarily associated with visual recognition, particularly of faces, objects
posterior fusiform gyrus (of temporal bone)
HSV-1 encephalitis (affects amygdala)
hypersexuality
hyperphagia
Kluver-Bucy Syndrome
central core (deep brain)
#5
foramen of monro
connects lateral ventricle to third ventricle
Foramen of monro (#5)
6, 7, 8
- Putamen
- Genu of internal capsule
- Thalamus
9
Insula
Striatum (Caudate nucleus + Putamen) and Globus Pallidus
Basal Ganglia
Main output of striatum (basal ganglia)
cortex to basal ganglia to thalamus and back to cortex
Globus Pallidus
8
Thalamus
primary auditory cortex of temporal lobe gets input from what of thalamus
medial geniculate body
primary visual cortex of occipital lobe receives input from ____ of thalamus
lateral geniculate body
All sensory information, except for olfaction, comes up in some way to sensory part of _______ and is relayed to primary sensory cortices of cortex
Thalamus
Ventral lateral nucleus of thalamus receives input from ____ and relays signal to primary motor cortex
cerebellum
ventral anterior nucleus of thalamus receives input from_______ and relays info to primary motor cortex
basal ganglia
this nucleus of thalamus is involved in tremor network
ventral intermediate nucleus
4 main arteries that supply the brain
2 internal carotid arteries (anterior)
2 vertebral arteries (posterior)
branches of internal carotids
anterior cerebral
middle cerebral
stroke sx’s involved with anterior cerebral a
lower extremity (leg weakness)
stroke sx’s involved with middle cerebral a
upper extremity and face
vertebral artery branches
posterior cerebrals
superior cerebellars
anterior inferior cerebellars
posterior inferior cerebellars
Communication between the anterior and posterior circulation
Circle of Willis
main arterial supply that runs in the front of pons/brainstem that is a combination of vertebral arteries
Basilar artery
posterior cerebrals supply what
occipital lobe
cerebellar arteries supply what
cerebellum
major blood supply to lateral brain; these syndromes can be very life threatening
Middle Cerebral artery
major blood supply to medial brain
anterior cerebral artery
Vertebral arteries come in around C5/C6 penetrate dura around C1 and combine and form ______runs around the front side of brainstem
basilar artery
supplies medial part of temporal lobe and supplies occipital lobe
posterior cerebral artery
Temporary drop in bp, these are the areas most affected
Watershed Zones
where two arteries share perfusion in the brain
Watershed Zones
Poorly formed arteries and veins connected without an interposed capillary system; treacherous lesions to operate on
Arteriovenous Malformations
Come into ER with seizures; Associated with facial port-wine birthmark, glaucoma and abnormal brain surface blood vessels
Sturge-Weber Syndrome