Nokea
What do we call the layer of fatty tissue surrounding the axon of some neurons?
- A. cutaneous coating
- B. myelin sheath
- C. dendritic barrier
- D. synaptic sleeve
Correct Answer: B
Rationale: The myelin sheath is a layer of fatty tissue that surrounds the axons of some neurons, providing insulation and increasing the speed of electrical signal transmission. Myelin is produced by glial cells, such as oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system. Damage to the myelin sheath, as seen in conditions like multiple sclerosis, can impair neural communication and lead to neurological symptoms.
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Cell bodies for the motor supply of the trigeminal nerve lie
- A. Hypothalamus
- B. Midbrain
- C. Posterior to cerebral aqueduct
- D. Cerebral cortex
Correct Answer: B
Rationale: The motor nucleus of the trigeminal nerve is located in the midbrain. It supplies muscles of mastication, such as the masseter and temporalis.
In obtaining the history for the patient with carpal tunnel syndrome, you would expect to note a history of
- A. Pain and numbness or tingling sensation in the hand (over the palmar surface of the thumb, index finger, middle finger, and lateral aspect of the ring finger) that is worse at night.
- B. Crepitus (grating feeling on palpation over joint during range of motion) due to loss of articular cartilage and bony overgrowth in joint.
- C. Excessive forward curvature of the thoracic spine (kyphosis) owing to pathologic vertebral fractures, and collapsing of the anterior portion of the vertebral bodies in the thoracic area.
- D. Acute onset of excruciating pain in joint because of accumulation of uric acid within the joint.
Correct Answer: A
Rationale: Carpal tunnel syndrome symptoms include nocturnal pain and paresthesia in the median nerve distribution.
Application of RICE (rest, ice, compression, and elevation) is indicated for initial management of which type of injury?
- A. Muscle spasms
- B. Sprains and strains
- C. Repetitive strain injury
- D. Dislocations and subluxations
Correct Answer: B
Rationale: RICE is effective for managing acute soft tissue injuries like sprains and strains.
Which kind of hip fracture is usually repaired with a hip prosthesis?
- A. Intracapsular
- B. Extracapsular
- C. Subtrochanteric
- D. Intertrochanteric
Correct Answer: A
Rationale: Intracapsular fractures often require prosthetic repair.
The cerebellum, ________ portion of the brain, is located below the occipital lobes of the cerebrum.
- A. the largest
- B. the second largest
- C. the third largest
- D. the smallest
Correct Answer: B
Rationale: The cerebellum is the second largest portion of the brain, located below the occipital lobes of the cerebrum. It plays a crucial role in coordinating voluntary movements, balance, and posture. While the cerebrum is the largest part of the brain, the cerebellum is smaller but still significant in size and function. Therefore, the second largest is the correct answer.