CNS, MSK and Special Senses MCQs Part 2

11. Lesions within the basal ganglia produce the following signs except:
Hypotonia
Tremor
Hemiballisumus
Athetosis

12. Centre of activity of autonomic nervous ?

Midbrain
Cerebrum
Hypothalamus
Pons


13. Which of the following is not true for myelinated nerve fibers?
Impulse from myelinated nerve fibers is slower than that of non myelinated fibers
Membrane currents are generated at nodes of Ranvier
Saltatory conduction of impulses is seen
Local anesthesia is possible only when the nerve is not covered by myelin sheath

14. Receptors for olfactory sensation are present in?

Lateral walls
Nasal septum
Lateral wall and nasal septum above superior concha
None of the above

15. Tremors are seen in disorders of:
Basal ganglia
Pain pathway
Pyramidal tract
Parathyroid gland

16.Voluntary movement of eyeball is controlled by:

Superior colliculus
Frontal eye field
Cerebellum
Visual cortex area

17.Unmyelinated fibers differ from myelinated nerve fibers in that they:
have increased excitability
have no nodes of Ranvier
have no power of regeneration
have no association of schwann cells

18.Breathing ceases upon destruction of the:

Cerebrum
Medulla oblongata
Hypothalamus
Cerebellum

19. The sensory receptors serving the stretch reflex are:
propriocepters
nociceptors
exteroceptors
chemoreceptors
20. In CNS myelination is carried out by:

Schwann cells
Astrocytes
Microglia
Oligodendrocytes

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MCQs on Oral Histology - Enamel Part 3

# The type of fibrous element in enamel is :
A. Tonofilament
B. Keratin like fiber
C. Collagen fiber
D. Vimentin filament

# Calcification in enamel starts at :
A. Enamel Matrix
B. Root
C. CEJ
D. DEJ

# Specific gravity of enamel is :
A. 2.8
B. 3.8
C. 4.8
D. 2.3

# Inorganic content of enamel is about :
A. 35 %
B. 50 %
C. 4 %
D. 96 %

# Length of enamel rods is :
A. Greater than the thickness of the enamel
B. Less then the thickness of the enamel
C. Equal to the thickness of the enamel
D. None of the above


# The diameter of the rod is:
A. 4 micrometer
B. 9 micrometer
C. 7 micrometer
D. 2 micrometer

# Which of the following statement is correct ?
A. In cross sections enamel rods appear hexagonal and resemble fish scales
B. The bodies of rods are near occlusal and incisal surfaces , whereas the tails point cervically
C. The apatite crystals are parallel to bodies and deviate 65 degrees from the tails
D. All of the above

# Which of the following is true about direction of enamel rods?
A. They originate at right angle to dentin surface
B. They are almost vertical near the incisal edge or cusp tip areas
C. In the cervical third of deciduous crowns they are almost horizontal in direction
D. In cervical region of permanent teeth , they deviate in apical direction
E. All of the above

# Thin leaf like structures that extend from enamel surface into the DEJ are :
A. Enamel spindles
B. Enamel lamella
C. Enamel Tufts
D. Perikymata

# Dentinoenamel junction is :
A. Non scalloped
B. Straight
C. Scalloped and the convexities are directed towards dentin
D. Scalloped and the convexities are directed towards enamel

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MCQs on Oral Histology - Enamel

# Perikymata are the external surface manifestations of :
A. Enamel rods
B. Incremental lines of Retzius
C. Nasmyth's membrane
D. Pellicle

# The percentage of inorganic matter in fully developed enamel is about:
A. 66 %
B. 76 %
C. 86 %
D. 96 %

MCQs on Oral Histology - Cementum

# Cementum :

A. Is derived from the sheath of Hertwig
B. Is acellular in the apical third of the tooth
C. Often overlaps the enamel
D. Does not contain collagen fibers

# Cellular cementum and compact bone contain :
A. Sharpey's fibers and elastic fibers
B. Collagen fibers and blood vessels
C. Canaliculi and incremental lines
D. Lacunae and elastic fibers