MCQs on Oral Histology - Enamel Part 4

# Hertwig's root sheath is formed from:
A. Stratum intermedium
B. Stellate reticulum
C. Outer enamel epithelium
D. Cervical loop

# Chronological hypoplasia is :
A. Hypoplasia of local origin
B. Hypoplasia of systemic origin
C. Hypoplasia of hereditary origin
D. None of the above

# Moth eaten appearance of enamel is seen in :
A. Odontodysplasia
B. Amelogenesis Imperfecta
C. Dentin dysplasia
D. Mottled enamel

# Formation of dentin by odontoblasts begin in :
A. Morphogenic stage
B. Organizing stage
C. Desmolytic stage
D. Formative stage

# Which of the following is correct ?
A. Each rod is formed by four ameloblasts
B. Each ameloblast contributes to four different rods
C. Head of the rod is formed by one ameloblast, and tail is formed by three other ameloblasts
D. All of the above
# The striking difference between enamel and other mineralised tissue is :
A. Presence of high percentage of organic matrix
B. Presence of incremental lines
C. Enamel has high reparative capacity
D. Most of the organic component is lost during mineralisation

# Shape of enamel rod is :
A. Key hole or paddle shaped
B. Square
C. Round
D. None of the above

# Enamel is laid down :
A. Mainly by odontoblasts
B. Mainly by ameloblasts
C. Only by odontoblasts
D. Only by ameloblasts

# Ameloblast is :
A. A cell from which tooth enamel is formed
B. A tissue from which tooth erupts
C. A tumour of the jaw
D. responsible to form dentin

# Synthesis of enamel matrix proteins occurs in the :
A. Outer enamel epithelium
B. Ameloblast
C. Stratum intermedium
D. Stratum granulosum

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CNS, MSK and Special Senses MCQs part 5

41. Anterior limit of the infratemporal fossa is:
Lateral pterygoid plate
Maxillary posterior wall
Pterygomaxillary fissure
Mastoid process

42. Muscle which pulls the disk of TMJ downward is:
Lateral pterygoid
Medial pterygoid
Digastric
Mylohyoid

43. The orbital opening is somewhat:
Quadrangular
oblong
circular
oval

44. The suture between the two halves of the
 frontal bone is:
Mendosal suture
symphysis
Coronal suture
Metopic suture

45. Deepest layer of deep cervical fascia is:
Prevertebral
Carotid sheath
Pretracheal
Temporal

46. Submandibular gland is situated in:
Digastric triangle
Carotid triangle
Muscular triangle
Deep to hyoglossus muscle

47. Duct of parotid gland crosses over the masseter muscle and pierces the :
Superior constrictor
Lateral Petrygoid
Buccinator
Zygomaticus major

48. Surgical excision of parotid gland endangers which of the following structures:
Hyoglossal nerve
Motor nerve of the muscles of mastication
External Carotid artery, auriculotemporal nerve, facial nerve
Lesser occipital nerve and the spinal accessory nerve

49. Duct of Rivinus is associated with :
Parotid gland
Submandibular gland
Sublingual gland
Minor salvary gland

50. Cricothyroid is supplied by:
Vagus
Recurrent laryngeal nerve
Superior laryngeal nerve
Hypoglossal nerve

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CNS, MSK and Special Senses MCQs Part 4

31. Wallenberg degeneration is seen in:
Proximal cut end of nerve with cell body
Distal cut end of nerve without cell body
Both the free ends of the cut nerve
All are true

32. In cerebellar disease, all the statements are correct except:
The Romberg's sign is positive
there is adiadochokinesia
there is pendular knee jerk
there is involuntary tremor

33. Swallowing center is situated in:
Midbrain
Pons
Medulla
Cerebellum

34. Hyperkinetic syndromes such as chorea and athetosis are usually associated with pathological changes in:
Motor areas of cerebral cortex
Anterior hypothalamus
Pathways for recurrent collateral inhibition in the spinal cord
Basal ganglia complex

35. Gag reflex is mediated by the cranial nerve:
VII
IX
X
XII

36. In the embryo, spinal cord extends upto the level of:
First lumbar vertebra
Fifth lumbar vertebra
Third sacral vertebra
Last coccygeal vertebra

37. Lateral part of middle cranial fossa and posterior cranial fossa are divided by:
Petrous temporal bone
Crista galli
Transverse groove
Sphenoid bone

38. Which of the following is not present on the internal surface of mandible?
Genial tubercle
Mylohyoid ridge
Lingula
Mental foramen

39. Among these foramina present in the base of skull, the one most posteriorly present is:
Foramen spinosum
Foramen rotundum
Foramen lacerum
FOramen ovale

40. The palatine bone furnishes the link between:
Maxilla and the sphenoid bone
Sphenoid and the ethmoid bone
Sphenoid and the vomer
None of the above

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CNS, MSK and Special Senses MCQs Part 3

21. Abdominal visceral pain is transmitted by:
A fibers
C fibers
Parasympathetic fibers
sympathetic fibers

22. Chromatolysis is :

Disintegration of nucleus
Disintegration of Golgi apparatus
Disintegration of Nissl granules
Decrease in cell size

23. Aphasia is most likely to be associated with a lesion in:
Broca's area
Sensory area
primary motor area
Visual area

24. Body temperature is maintained by:

Postural position
Covering of the body
Peripheral vasoconstriction
All of the above

25. The term "myopia" refers to :
Constriction of the pupil
Dilation of the pupil
Near sightedness
Far sightedness

26.Which receptor is responsible for monitoring the rate
 of muscle stretch?
Nuclear bag intrafusal fibers
Nuclear chain
Golgi tendon organ
Pacinian corpuscles

27. Neurotransmitter in nigrostrial pathway is:
Dopamine
GABA
Acetylcholine
Norepinephrine

28. First change to occur after nerve cut is:
Schwann cell mitosis
Axonal sprouting
Myelin sheath degeneration
Nuclear degeneration

29. First change to occur in the distal segment of cut :
Myelin degeneration
Axonal degeneration
Mitosis of schwann cell
Sprouting

30. Which sensation is not lost on the side of lesion in 
Brown Sequard syndrome?:
Touch
Vibration sense
Muscle sense
Temperature


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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 %