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Affection of the cerebellar may produce any of the following EXCEPT:
- A. positive Romberg's test
- B. positive finger to nose test
- C. positive heel to knee test
- D. positive Rinner & Weber test
Correct Answer: D
Rationale: Positive Rinner & Weber test is the correct answer because these tests are used to assess hearing and are not related to cerebellar function. The cerebellum is involved in coordination and balance, so tests like Romberg's, finger-to-nose, and heel-to-knee are used to evaluate cerebellar integrity, while Rinner and Weber tests are auditory assessments.
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The tiny space between neurons or a neuron and its target muscle is the:
- A. dendrite
- B. axon
- C. neuron cell body
- D. synapse
Correct Answer: D
Rationale: The synapse is the tiny gap between neurons or between a neuron and its target cell, such as a muscle. It is the site where neurotransmitters are released to transmit signals from one cell to another. When an action potential reaches the axon terminal, neurotransmitters are released into the synapse and bind to receptors on the postsynaptic cell, triggering a response. The synapse is crucial for communication within the nervous system.
A patient exhibits sudden, severe headache and neck stiffness. What should the nurse do first?
- A. Perform a neurologic assessment and evaluate for signs of meningeal irritation.
- B. Measure the patient's blood pressure.
- C. Check the patient's blood glucose levels.
- D. Inspect the patient's throat.
Correct Answer: A
Rationale: Sudden, severe headache and neck stiffness may indicate meningitis. A neurologic assessment and evaluation for meningeal irritation are critical. Blood pressure, glucose levels, and throat inspection are secondary.
The Schwann cells form a myelin sheath around the:
- A. dendrites
- B. cell body
- C. nucleus
- D. axon
Correct Answer: D
Rationale: Schwann cells are responsible for forming the myelin sheath around axons in the peripheral nervous system (PNS). Dendrites, cell bodies, nuclei, and nodes of Ranvier are not directly myelinated by Schwann cells. Therefore, D is the correct answer.
The elevated ridges of tissue on the surface of the cerebral hemispheres are known as ______ while the shallow grooves are termed ______.
- A. sulci; gyri
- B. gyri; sulci
- C. ganglia; gyri
- D. tracts; ganglia
Correct Answer: B
Rationale: The elevated ridges on the cerebral hemispheres are called gyri, and the shallow grooves are called sulci. Ganglia, tracts, receptors, and effectors are unrelated to these structures. Thus, B is the correct answer.
The following muscles are supplied by posterior rami of spinal nerves EXCEPT
- A. Erector spinae
- B. Levator costae
- C. Splenius
- D. Scalene posterior
Correct Answer: D
Rationale: The scalene muscles are innervated by the anterior rami of cervical spinal nerves, not the posterior rami. The posterior rami supply intrinsic back muscles like the erector spinae.