A. Impulse through myelinated fibers is slower than non- myelinated fibers
B. Membrane currents are generated at nodes of Ranvier
C. Saltatory conduction of impulses is seen
D. Local anesthesia is effective only when the nerve is not covered by myelin sheath
Related Mcqs:
- Unmyelinated fibres differ from myelinated fibers in that they ______________?
A. Have increased excitability
B. Have to nodes of Ranvier
C. Have no power of regeneration
D. Have no association of Schwann cells - The hypoglossal nerve is the motor nerve to all of the muscles of the tongue except, the____________?
A. Genioglossus
B. Palatoglossus
C. Superior longitudinal muscle
D. Inferior longitudinal muscle - Which of the following is not true regarding trigeminal nerve ?
A. Roots of trigeminal nerve are attached to pons
B. It has three main divisions
C. Trigeminal nerve supplies the dura mater of middle cranial fossa
D. The trigeminal ganglion contributes to the sensory root only - All of the following is true of facial nerve except_______________?
A. Supplies motor branches to the muscles of facial expression
B. It has no sensory component
C. The muscles of the eyelid will be spared in upper motor neuron lesions
D. It is a nerve of 2nd arch - The following statements concerning chorda tympani nerve are true except that it_____________?
A. Carries secretomotor fibrers to submandibular gland
B. Joints lingual nerve in infratemporal fossa
C. Is a branch of facial nerve
D. Contains postganglionic parasympathetic fibers - All are true of mandibular nerve except________________?
A. Sensory branch arises from anterior trunk
B. Muscles of mastication are innervated by branches of main trunk
C. Nerve to medial pterygoid arises from main trunk
D. Buccal nerve innervated buccinator muscle - True about occulomotor nerve are all except____________?
A. Carries parasympathertic fibres
B. Causes constriction of pupils
C. Supplies inferior oblique muscle
D. Passes through inferior orbital fissure - Gag reflex is mediated by _______ cranial nerve ?
A. VII
B. IX
C. X
D. XII - Resting membrane potential of nerve fiber is_______________?
A. -70 mv
B. -90 mv
C. -55 mv
D. + 35 mv - First change to occur after nerve cut is_______________?
A. Schwan cell mitosis
B. Axonal sprouting
C. Myelin sheath degeneration
D. Nuclear disintegration
