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Brain Stem
Gross Anatomy
nerve
shallow
groove
*
*
** **
“notch”
subtle
bumps
slight
ridges
figure 11-3A
* location of
** location of
* location of
*
*
Brain Stem
Gross Anatomy
nerve
nerve
nerve
nerve
nerve
ridge
nerve(s)
bulge
nerve
nerve
figure 11-3B
cranial nerves
medulla structures
A
A
figure 3-17
Blood Flow to Brain
two sources
#1 via Internal Carotid Arteries (ICAs)
extends up into the skull via the carotid canal
projects up to the cavernous sinus
gives rise to opthalmic artery (OA)
located at the origin of the optic nerve at the base of the brain
gives rise to anterior choroidal artery (AChrA) and
posterior communicating artery (PCommA)
bifurcates to form anterior cerbral artery (ACA) and
middle cerebral artery (MCA)
anterior cerebral arteries are connected by
anterior communicating artery (ACommA)
Blood Flow to Brain
#2 via Vertebral Arteries (VAs)
branch off subclavian arteries
run through the transverse processes of cervical vertebrae to base of skull
give rise to anterior (ASpA) and posterior (PSpA) spinal arteries
for cervical spinal cord
pass through foramen magnum
run along anterior surface of brain stem
give off posterior inferior cerebellar arteries (PICAs)
unite to form basilar artery (BA)
give rise to anterior inferior cerebellar arteries (AICAs) and
superior cerebellar arteries (SCAs)
ICA
ICA
Blood Flow to Brain
Circle of Willis
“normal pattern”
anterior communicating a
anterior cerebral a
middle cerebral a
internal carotid a
posterior communicating a
posterior cerebral a
collateral blood supply
variability
figure 6-10, 5th edition
basilar a
M555 Medical Neuroscience
Gross Anatomy Viewing Conventions Imaging
lobes
figure 3-5
figure 3-5
lateral surface
sulcus
figure 3-2
sulcus
frontal lobe
notch
gyrus
frontal
gyri
figure 3-9
gyrus
parietal lobe
lobule
gyrus
gyrus
lobule
figure 3-10
gyrus
temporal lobe
figure 3-11
middle
inferior
temporal gyri
gyrus
ventral surface
bulb
tract
gyri
figure 3-16
(a bulge)
peduncle
(on surface of medulla)
insula
opercula
figure 3-6
gyri of insula
figure 3-8
occipital lobe
sulcus
figures 3-12
sulcus
medial surface
of corpus callosum
figure 3-2, B
of corpus callosum
medial surface
(space)
(space)
(opening)
(space)
figure 3-15
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