Which label in following figure indicates the typical plane of separation at which retinal detachment occurs?
Answer(s): D
Retinal separation typically occurs at the interface between the retinal pigment epithelium and the outer limit of the sensory (neural) retina. The weakness of this plane is attributed to the manner in which the retina develops, a process that involves obliteration of the space between two of the layers of the optic cup--an inner layer from which the sensory retina arises and an outer layer from which the retinal pigment epithelium arises. Other retinal layers are bridged by neuronal processes, and Müller cells (the retina's glial cells) span the entire thickness of the neural retina. Plane A(choice A) marks the boundary between the nerve fiber layer above and the ganglion cell layer below. The nerve fiber layer is composed of axons of the retinal ganglion cells. Plane B (choice B) is within the inner plexiform layer, the site of synaptic contacts between bipolar neurons, retinal ganglion cells, and amacrine cells. Plane C (choice C) is within the outer plexiform layer, the site of synapses among bipolar cells, rods and cones, and horizontal cells. The boundary between the choroid (of the middle vascular tunic or uvea) and the sclera (of the external, fibrous tunic) is marked by plane E (choice E).
A 28-year-old male patient suffering from head trauma resulting from a car accident is brought unconscious to the emergency room. In performing the pupillary light reflex, you notice that even though the left pupil constricts when you shine a light directly into the left eye, it does not do so when you shine a light into the right eye. This is best explained by a disconnection between which of the following bilateral structures?
Answer(s): A
The central visual pathway for the papillary light reflex is organized as follows: fibers from the ganglionic layer of the retina project posteriorly to the pretectum, which in turn innervates the Edinger- Westphal nucleus. Preganglionic parasympathetic neurons in the Edinger- Westphal nucleus project to the ciliary ganglion, which sends postganglionic parasympathetic innervation back to the constrictor pupillae of the eye. The Edinger-Westphal nuclei from each side of the midbrain are also connected to each other by projections running through the posterior commissure. Disconnection of these fibers will result in loss of the consensual papillary light reflex on the contralateral side, as happens in this case. The habenula (choice B) is a nucleus of the thalamus, which does not participate in the central visual pathways. The lateral geniculate nucleus (choice D) receives fibers from the ganglionic layer of the retina. However, fibers participating in the papillary light reflex run through this structure without synapsing and terminate in the pretectum. Thus, the lateral geniculate nucleus does not participate in the pupillary light reflex. The inferior colliculus (choice C) and the medial geniculate nucleus (choice E) are components of the auditory system.
A 45-year-old female patient presents to the emergency room with a headache and complains of abnormal sensations on the left side of her body. She claims that the sensory changes came on rapidly in the last few hours. Her laboratory reports come back normal, a spinal tap reveals normal cerebrospinal fluid (CSF), and her mental ability seems good. You perform a neurological examination and find she has greatly reduced sensation on the entire left side of her body, including her face. The sensory loss includes all modalities. The motor examination is normal, as is her visual examination and hearing examination. Based on the neurological findings, which of the following thalamic nuclei would be involved?
Answer(s): E
The ventral posterior lateral (VPL) and ventral posterior medial (VPM) nuclei are sensory relay thalamic nuclei. The lateral and medial geniculate nuclei (choice A) are respectively concerned with visual and auditory sensory information. The lateral dorsal (LD) and lateral posterior (LP) nuclei (choice B), and the pulvinar (choice C) are association or multimodal relay nuclei. The ventral anterior (VA) and ventral lateral (VL) are motor relay nuclei.
A patient has been admitted for hematemesis (vomiting of blood). Endoscopic examination reveals bleeding esophageal varices resulting from portal obstruction. These varices represent anastomoses between branches of which of the following?
Answer(s): B
Obstruction of the portal vein results in an increase in the collateral circulation between veins that normally drain to the portal vein and those that drain to the systemic veins. Choices A, B, D, and E all represent possible collateral venous circulation in case of portal obstruction. Choice A is rare because the ductus venosus closes after birth. Choice B is correct because varicose veins in this region give rise to esophageal varices. Choice D results in varicose veins in the rectal region. Choice C is incorrect because there is no connection between the right gastric vein and the inferior vena cava. In choice E, enlargement of the epigastric veins results in varicose veins radiating from the umbilicus, the caput medusae.
A 15-year-old high school football player is brought to the emergency room. On examination, his right lower limb is deformed and swollen around the knee. At full extension, there is valgus instability, suggestive of knee dislocation. The patient is in great pain and there is a concern for concomitant vascular and nervous injuries. Palpation of the dorsalis pedis artery reveals a normal pulse. However, neurological examination reveals impaired dorsiflexion of the foot with decreased sensation in the space between digits 1 and 2.Which of the following nerves is affected?
The deep peroneal (fibular) nerve innervates the muscles responsible for dorsiflexion in the anterior compartment of the leg. It also provides for the cutaneous innervation of the space between digits 1 and 2. The femoral nerve (choice B) innervates muscles in the anterior compartment of the thigh and the skin of the medial aspect of the leg by a continuing branch, the saphenous nerve (choice C). The superficial peroneal (fibular) nerve (choice D) innervates the lateral compartment of the leg and muscles responsible for foot eversion. The tibial nerve (choice E) innervates the posterior compartment of the leg and the muscles responsible for plantar flexion.
Share your comments for USMLE STEP1 exam with other users:
understand sql col.
i would give 5 stars to this website as i studied for az-800 exam from here. it has all the relevant material available for preparation. i got 890/1000 on the test.
this is nice.
q55- the ridac workflow can be modified using flow designer, correct answer is d not a
by far this is the most accurate exam dumps i have ever purchased. all questions are in the exam. i saw almost 90% of the questions word by word.
i cleared the az-104 exam by scoring 930/1000 on the exam. it was all possible due to this platform as it provides premium quality service. thank you!
question # 232: accessibility, privacy, and innovation are not data quality dimensions.
looks wrong answer for 443 question, please check and update
great question
question: a user wants to start a recruiting posting job posting. what must occur before the posting process can begin? 3 ans: comment- option e is incorrect reason: as part of enablement steps, sap recommends that to be able to post jobs to a job board, a user need to have the correct permission and secondly, be associated with one posting profile at minimum
answer to question 72 is d [sys_user_role]
please provide the pdf
hey guys, just to let you all know that i cleared my 312-38 today within 1 hr with 100 questions and passed. thank you so much brain-dumps.net all the questions that ive studied in this dump came out exactly the same word for word "verbatim". you rock brain-dumps.net!!! section name total score gained score network perimeter protection 16 11 incident response 10 8 enterprise virtual, cloud, and wireless network protection 12 8 application and data protection 13 10 network défense management 10 9 endpoint protection 15 12 incident d
very helpful
useful questions
page :20 https://exam-dumps.com/snowflake/free-cof-c02-braindumps.html?p=20#collapse_453 q 74: true or false: pipes can be suspended and resumed. true. desc.: pausing or resuming pipes in addition to the pipe owner, a role that has the following minimum permissions can pause or resume the pipe https://docs.snowflake.com/en/user-guide/data-load-snowpipe-intro
i want hcia exam dumps
good training
very useful
yes need this exam dumps
these questions are a great eye opener
thank you for providing these questions and answers. they helped me pass my exam. you guys are great.
good knowledge
answer 10 should be a because only a new project will be created & the organization is the same.
can you please upload the dump again
is it legit questions from sap certifications ?
question 16 should be b (changing the connector settings on the monitor) pc and monitor were powered on. the lights on the pc are on indicating power. the monitor is showing an error text indicating that it is receiving power too. this is a clear sign of having the wrong input selected on the monitor. thus, the "connector setting" needs to be switched from hdmi to display port on the monitor so it receives the signal from the pc, or the other way around (display port to hdmi).
q 10. ans is d (in the target org: open deployment settings, click edit next to the source org. select allow inbound changes and save
i purchased this exam dumps from another website with way more questions but they were all invalid and outdate. this exam dumps was right to the point and all from recent exam. it was a hard pass.
it was a good experience and i got 90% in the 200-901 exam.
hi please upload this
please upload it
really need this dump. can you please help.