Damage to which cranial nerve will the patient have an asymmetric grin?
XI
I
VII
VIII
The Correct Answer is C
The facial nerve (CN VII) provides motor innervation to the muscles of facial expression, including the zygomaticus major and orbicularis oris. Lesions to this nerve, such as in Bell's palsy or cerebrovascular accidents, result in unilateral weakness or paralysis. This manifests clinically as nasolabial fold flattening and an inability to smile symmetrically.
A. XI: The accessory nerve is a purely motor nerve that innervates the sternocleidomastoid and trapezius muscles. Damage to this nerve results in weakness when shrugging the shoulders or turning the head against resistance. It has no role in the motor control of facial smiling or grinning.
B. I: The olfactory nerve is a special sensory nerve dedicated solely to the sense of smell. It does not possess any motor fibers and therefore cannot influence the movement of facial muscles. Damage to this nerve causes anosmia rather than any visible physical asymmetry of the face.
C. VII: Cranial nerve VII is responsible for the symmetrical movement of the mouth during a smile or grin. If damaged, the muscles on the affected side fail to contract, causing the mouth to droop or appear crooked. This is the standard diagnostic nerve associated with an asymmetric grin.
D. VIII: The vestibulocochlear nerve is responsible for hearing and balance. It carries sensory information from the inner ear to the brain and has no motor components. Damage results in deafness or vertigo, but it does not alter the physical appearance or motor function of the facial muscles.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
An adult with a complete set of permanent teeth possesses 32 structures, including the third molars (wisdom teeth). These are categorized into incisors, canines, premolars, and molars, each designed for specific mechanical digestive functions. This set replaces the deciduous teeth, which total 20 in the pediatric population.
A. 20: This is the normal number of primary or "baby" teeth found in children. Deciduous teeth serve as placeholders for the permanent set but are eventually shed. An adult with only 20 teeth would have significant dental loss or developmental anomalies.
B. 32: A full adult dentition consists of 8 incisors, 4 canines, 8 premolars, and 12 molars (including 4 wisdom teeth). This is the standard anatomical count used in clinical dental and physical assessments. It reflects the completion of dental development by early adulthood.
C. 16: This number represents exactly half of a full adult set of teeth, typically the count for either the maxillary or mandibular arch alone. Documenting 16 teeth in an entire adult mouth would indicate severe dental decay or extraction.
D. 28: While many adults have 28 teeth if their third molars (wisdom teeth) have been surgically removed or never erupted, the "normal" biological count for the full permanent set is 32. Dental assessments use 32 as the baseline for a complete human adult mouth.
Correct Answer is B
Explanation
Body Mass Index (BMI) is a standardized screening tool that correlates body weight with height to estimate adiposity and nutritional risk. A value below the healthy threshold suggests protein-energy malnutrition or underlying wasting diseases. This category is associated with increased risks of impaired wound healing, sarcopenia, and compromised immune function.
A. 25.0 to 29.9 kg/m2: This range is classified as the "Overweight" category for adults. While it may carry risks for metabolic syndrome or cardiovascular disease, it does not indicate malnutrition in terms of caloric or protein deficiency. It represents a surplus of body mass relative to height.
B. <18.5 kg/m2: A BMI of less than 18.5 is the internationally recognized threshold for "Underweight." In a clinical nutritional assessment, this finding is a primary indicator of potential malnutrition. It necessitates further evaluation of dietary intake and screening for malabsorption or systemic illness.
C. 18.5 to 24.9 kg/m2: This is the "Normal" or "Healthy Weight" range for the majority of the adult population. It indicates that the individual's weight is appropriate for their height, posing the lowest risk for weight-related health problems. It is the target range for optimal nutritional status.
D. 30.0 to 39.9 kg/m2: This range identifies "Obesity" (Classes I and II). While an individual in this category can suffer from micronutrient deficiencies, the BMI itself indicates an excess of body mass rather than the depletion associated with clinical malnutrition.
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