The great cerebral vein of Galen indicated by arrow 4 in following figure is formed by the union of two internal cerebral veins and drains into which of the following?
Answer(s): D
The great cerebral vein of Galen (arrow 4) drains posteriorly into the straight sinus (arrow 5). The union of the superior sagittal sinus (choice E; arrow 3) and the straight sinus forms the confluence of sinuses (choice A). The straight sinus and superior sagittal sinus are dural venous sinuses: they contain venous blood draining form the brain, skull, and scalp. The frontal sinus (choice B) and the sphenoid sinus (choice C) are bony sinuses: they are hollow, airfilled structures and do not drain venous blood.
A 42-year-old female patient has to undergo emergency cholecystectomy due to intense biliary colic. The structure to be removed during the surgery is indicated in following figure by which of the following arrows?
Answer(s): B
Arrow 2 points to the gallbladder, which will be removed during the cholecystectomy (surgical removal of the gallbladder). Biliary colic may be due to impaction of a gallstone in the cystic duct, resulting in cholecystitis (inflammation of the gallbladder). Arrow 1 (choice A) points to the liver. Arrow 3 (choice C) points to the transverse colon. Arrow 4 (choice D) points to the spleen and arrow 5 (choice E) indicates the stomach, recognizable by its internal rugae.
Apatient with a developing astroglioma in the primary auditory cortex (Brodmann's area 41) complains of hearing unusual noises. What is the main source of subcortical input to the primary auditory cortex?
Answer(s): C
The main subcortical afferents to the primary auditory cortex (Brodmann's area 41) arise from the medial geniculate nucleus of the thalamus. The inferior colliculus (choice A) is a midbrain auditory relay nucleus, which sends projections to the medial geniculate nucleus. The lateral geniculate nucleus (choice B) is a visual relay nucleus in the thalamus and it projects to the primary visual cortex (Brodmann's area 17). The superior colliculus (choice D) is a midbrain visual relay nucleus, which provides fibers to the tectospinal tract. The superior olivary nucleus (choice E) is a medullary auditory relay nucleus, which sends projections to the cochlea.
A 65-year-old male patient develops neurological symptoms due to an embolus in the left common carotid artery. In the CT scan in following figure, the involved vessel is indicated by which of the following arrows?
Arrow 4 points to the left common carotid artery. The three arteries arising from the arch of the aorta are lined anteriorly to posteriorly on a slanted line: arrow 3 (choice C) shows the brachiocephalic artery, arrow 4 (choice D) points to the left common carotid artery, and arrow 5 (choice E) indicates the left subclavian artery. Arrow 2 (choice B) points to the right brachiocephalic vein, which is joined here by the left brachiocephalic vein. Arrow 1 (choice A) points to the trachea, which is filled with air and thus is not radiopaque.
A 53-year-old male patient has developed an abnormal hypersensitivity in the face area. He complains that he feels pain when he drives with the window down and from the wind blowing on his face. The pain is exacerbated by direct touch to the left side of his lower jaw. The patient is diagnosed with trigeminal neuralgia (tic douloureux). Where do pain fibers from the left side of his mandible project to?
Fibers from pain and temperature receptors in the face area all project to the spinal (descending) trigeminal nucleus. The mesencephalic trigeminal nucleus (choice A) contains the perikarya of the proprioceptive fibers of the muscles of mastication. The motor trigeminal nucleus (choice B) receives innervations from the mesencephalic trigeminal nucleus. The principal sensory trigeminal nucleus (choice C) receives somatosensory fibers from the face, gums, teeth, and anterior two-thirds of the tongue. The trigeminal (gasserian) ganglion (choice E) contains the sensory perikarya of all three subdivisions of the trigeminal nerve.
Share your comments for USMLE STEP1 exam with other users:
great job whoever put this together, for the greater good! thanks!
just started to view all questions for the exam
helpful material
hope for the best
will post exam has finished
really correct and good analyze!
excellent thanks a lot
will post once pass the cka exam
good content
q:32 answer has to be option c
nice questions
i really like the support team in this website. they are fast in communication and very helpful.
a good contemporary exam review
q23, its an array, isnt it? starts with [ and end with ]. its an array of objects, not object.
cool very helpfull
i just passed. this exam dumps is the same one from prepaway and examcollection. it has all the real test questions.
is this a valid prince2 practitioner dumps?
all are relatable questions
might help me to prepare for the exam
just paid and downlaod the 2 exams using the 50% sale discount. so far i was able to download the pdf and the test engine. all looks good.
i think it should be a,c. option d goes against the principle of building anything custom unless there are no work arounds available
very legible
is this exam accurate or helpful?
please upload dump, i have exam in 2 days
this is useful
question 232 answer should be perimeter not netowrk layer. wrong answer selected
hi team, could you please provide this dump ?
very helpful to clear the exam and understand the concept.
i think it is great that you are helping people when they need it. thanks.
cannot evaluate yet
a laptops wireless antenna is most likely located in the bezel of the lid
good examplae to learn basic
this is useful information