ATSU SOMA Anatomy Blood Supply of
the Brain
After how many seconds of brain ischemia do we lose consciousness? - correct answer ✔✔10 seconds
After how many seconds of brain ischemia do we lose electrical activity? - correct answer ✔✔20 seconds
After how long of brain ischemia does irreversible damage begin? - correct answer ✔✔A few minutes
Which arteries provide about 80% of the blood to the brain, suppling most of the telencephalon and
much of the diencephalon? - correct answer ✔✔Internal carotid arteries
Which arteries provides about 20% of the blood to the brain, supplying the brainstem and cerebellum, as
well as parts of the diencephalon, spinal cord, occipital and temporal lobes? - correct answer
✔✔Vertebral arteries
Which sinus does the internal carotid artery pass through before it gives rise to the ophthalmic artery? -
correct answer ✔✔Cavernous sinus
Which artery does the internal carotid artery give rise to after passing through the cavernous sinus? -
correct answer ✔✔Ophthalmic artery
The ophthalmic artery is vulnerable to atherosclerotic plaques which can cause what? - correct answer
✔✔Transient ischemia attach (TIA)
After the internal carotid artery passes through the cavernous sinus and gives rise to the Ophthalmic
artery, it proceeds superiorly along the optic chiasm and bifurcates into which arteries? - correct answer
✔✔Middle cerebral artery
Anterior cerebral artery
, Before the internal carotid artery bifurcates into middle and anterior cerebral arteries, it gives rise to two
smaller branches, which are? - correct answer ✔✔Anterior choroidal artery
Posterior communicating artery
The posterior communicating artery passes posterior, inferior to the optic tract toward the cerebral
peduncle and joins which artery? - correct answer ✔✔Posterior cerebral artery
Small perforating branches from the posterior communicating artery supply which parts of the brain? -
correct answer ✔✔Thalamus
Hypothalamus
The two anterior cerebral arteries, which run medially, superior to the optic nerve, near their entrance
into the longitudinal fissure are connected by which artery? - correct answer ✔✔Anterior
communicating artery
Small perforating arteries branch off from the anterior communicating artery and supply anterior
portions of which brain structure? - correct answer ✔✔Hypothalamus
The anterior cerebral arteries follow the corpus callosum posteriorly to supply medial parts of which
lobes of the brain? - correct answer ✔✔Frontal
Parietal
Distal to the anterior communicating artery, the anterior cerebral artery continues as an artery that stays
immediately adjacent to the corpus callosum. What is this artery? - correct answer ✔✔Pericallosal
artery
Which artery branches off from the pericallosal artery near the genu of the corpus callosum and follows
the cingulate sulcus? - correct answer ✔✔Callosomarginal artery
Occlusion of the anterior cerebral artery can cause restricted (ipsilateral/contralateral) motor and
somatosensory deficits (this affects which limb more than others?) - correct answer ✔✔Contralateral
the Brain
After how many seconds of brain ischemia do we lose consciousness? - correct answer ✔✔10 seconds
After how many seconds of brain ischemia do we lose electrical activity? - correct answer ✔✔20 seconds
After how long of brain ischemia does irreversible damage begin? - correct answer ✔✔A few minutes
Which arteries provide about 80% of the blood to the brain, suppling most of the telencephalon and
much of the diencephalon? - correct answer ✔✔Internal carotid arteries
Which arteries provides about 20% of the blood to the brain, supplying the brainstem and cerebellum, as
well as parts of the diencephalon, spinal cord, occipital and temporal lobes? - correct answer
✔✔Vertebral arteries
Which sinus does the internal carotid artery pass through before it gives rise to the ophthalmic artery? -
correct answer ✔✔Cavernous sinus
Which artery does the internal carotid artery give rise to after passing through the cavernous sinus? -
correct answer ✔✔Ophthalmic artery
The ophthalmic artery is vulnerable to atherosclerotic plaques which can cause what? - correct answer
✔✔Transient ischemia attach (TIA)
After the internal carotid artery passes through the cavernous sinus and gives rise to the Ophthalmic
artery, it proceeds superiorly along the optic chiasm and bifurcates into which arteries? - correct answer
✔✔Middle cerebral artery
Anterior cerebral artery
, Before the internal carotid artery bifurcates into middle and anterior cerebral arteries, it gives rise to two
smaller branches, which are? - correct answer ✔✔Anterior choroidal artery
Posterior communicating artery
The posterior communicating artery passes posterior, inferior to the optic tract toward the cerebral
peduncle and joins which artery? - correct answer ✔✔Posterior cerebral artery
Small perforating branches from the posterior communicating artery supply which parts of the brain? -
correct answer ✔✔Thalamus
Hypothalamus
The two anterior cerebral arteries, which run medially, superior to the optic nerve, near their entrance
into the longitudinal fissure are connected by which artery? - correct answer ✔✔Anterior
communicating artery
Small perforating arteries branch off from the anterior communicating artery and supply anterior
portions of which brain structure? - correct answer ✔✔Hypothalamus
The anterior cerebral arteries follow the corpus callosum posteriorly to supply medial parts of which
lobes of the brain? - correct answer ✔✔Frontal
Parietal
Distal to the anterior communicating artery, the anterior cerebral artery continues as an artery that stays
immediately adjacent to the corpus callosum. What is this artery? - correct answer ✔✔Pericallosal
artery
Which artery branches off from the pericallosal artery near the genu of the corpus callosum and follows
the cingulate sulcus? - correct answer ✔✔Callosomarginal artery
Occlusion of the anterior cerebral artery can cause restricted (ipsilateral/contralateral) motor and
somatosensory deficits (this affects which limb more than others?) - correct answer ✔✔Contralateral
