Basilar artery - Study guides, Class notes & Summaries

SCRN EXAM 2024/2025 WITH 100% ACCURATE SOLUTIONS A 67yo man with a hx of HTN, DM, HLD, and smoking presents to the ED. CC of persistent dizziness q1week that has become so severe he now has double vision, N/V. His wife tells you she noticed a L facial droop and slurring. Pt reports weakness in L arm and leg. He denies HA or SZ. Head CT was negative for acute bleed. Upon returning to the room he has become increasingly obtunded and difficult to arouse. You notice he now has a nystagmus and s...

Why Does the Brain Need Blood? Consumes 15-20% of the body’s total energy needs, (and receives 15% of Cardiac Output), despite being only 2% of total body mass. Neurons require high ATP to:  Maintain Ion Gradients across Plasma Membrane  Regulate Neurotransmitter synthesis/re-uptake. Neurons have NO ANAEROBIC CAPACITY → Therefore the brain absolutely depends on Oxygenated Blood.  Hence, any deficit in blood supply is detrimental (≈30+sec lack of blood/O2 to brain → u...

Posterior Cerebral Artery (PCA) - ACCURATE ANSWERS Arises from basilar. Supplies Occipital Lobe , Midbrain, Thalamus, Pineal Gland, Choroid Plexus, and Corpus Callosum Symptoms of PCA Stroke - ACCURATE ANSWERS -Contralateral Visual Field Homonymous hemianopia -Visual Agnosia (unable to interpret/recognize visual information) - Weber's Syndrome (3rd nerve palsy + contralateral hemiplegia) -Parinaud's Syndrome (Impaired upwards gaze, convergence-retraction nystagmus, primary conjugate ...

What happens when blood supply is cut off from the brain? Ans: unconsciousness with in 5-8sec Neuronal activity stops in less than 1 minute Irreversible brain damage within 4-6 minutes What makes up the circle of willis Ans: Veterbral arteries combine to form the basilar artery gives rise to the posterior cerebral artery, the posterior comunicating artery connects that to the internal carotid artery which branches into the middle and anterior cerebral arteries and the anterior communica...

SCRN EXAM REVIEW QUESTIONS AND ANSWERS Posterior Cerebral Artery (PCA) - ANS Arises from basilar. Supplies Occipital Lobe , Midbrain, Thalamus, Pineal Gland, Choroid Plexus, and Corpus Callosum Symptoms of PCA Stroke - ANS -Contralateral Visual Field Homonymous hemianopia -Visual Agnosia (unable to interpret/recognize visual information) - Weber's Syndrome (3rd nerve palsy + contralateral hemiplegia) -Parinaud's Syndrome (Impaired upwards gaze, convergence-retraction nystagmus, ...

Carotid artery system Ans: Comprised of the common carotid, external carotid, and internal carotid. Common carotid Ans: Ascends on each side of the neck. Divides into external and internal branches. External Carotid Artery Ans: Supplies blood the facial muscles, forehead, and oral/nasal/ orbital structures. Internal Carotid Artery Ans: Side branches supply the eyeballs and ocular muscles. main branch feeds the circle of Wilis Vertebral Aterial Systems Ans: • Arises from subclavian a...

Dysarthria Ans: Difficulty with speech caused by impairment of the tongue or muscles essential to speech Common Carotid Artery (CCA) Ans: Arises from the aortic arch on the left side and from the innominate artery on the right side Bruit Ans: Noise caused by tissue vibration produced by turbulence that cause flow disturbance Dysphagia Ans: Inability to swallow or difficulty in swallowing Ataxia Ans: Impaired ability to coordinate movement, especially disturbances in gait GRADE A+ ...

Posterior Cerebral Artery (PCA) - answer-Arises from basilar. Supplies Occipital Lobe , Midbrain, Thalamus, Pineal Gland, Choroid Plexus, and Corpus Callosum Symptoms of PCA Stroke - answer--Contralateral Visual Field Homonymous hemianopia -Visual Agnosia (unable to interpret/recognize visual information) - Weber's Syndrome (3rd nerve palsy + contralateral hemiplegia) -Parinaud's Syndrome (Impaired upwards gaze, convergence-retraction nystagmus, primary conjugate downward gaze) Anterio...

Which of the following drug is a proper choice for absence seizure? A. Valporate B. Gabapentin C. Carbamazepine D. Phenytoin correct answers A The most common causes of subarachnoid hemorrhage is A. Arterio-venous malformation B. Aneurysm C. Hypertension D. cavernous angioma correct answers B. The periumbilical area is innervated by which sensory deematones? A.C6 B.T2 C.T5 D.T10 E.S3 correct answers D Occlusion of which of the following arteries typically produces Walle...

SCRN EXAM REVIEW QUESTIONS AND ANSWERS ALL CORRECT Posterior Cerebral Artery (PCA) - ANS Arises from basilar. Supplies Occipital Lobe , Midbrain, Thalamus, Pineal Gland, Choroid Plexus, and Corpus Callosum Symptoms of PCA Stroke - ANS -Contralateral Visual Field Homonymous hemianopia -Visual Agnosia (unable to interpret/recognize visual information) - Weber's Syndrome (3rd nerve palsy + contralateral hemiplegia) -Parinaud's Syndrome (Impaired upwards gaze, convergence-retracti...