75.Which cusp of the maxillary molar is NOT part of the trigon (primitive cusp triangle)?

A. Mesiolingual    B. Mesiobuccal

C. Distolingual     D. Distobuccal

ANS> C. In evolution, three cusps of the maxillary molar are considered to be the 

primary cusp triangle, and the original three cusps of the evolving molar. They form the trigon, and are 

the MB, ML, and DB cusps. The fourth cusp, the DL, is the smallest, is considered to be a minor cusp, 

and is known evolutionarily as the talon, or talon cusp. This cusp is less conspicuous as you go from 

first to second to third maxillary molar. 

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74. At which of the following ages does fetal movement first occur?

A. 1 month B. 2 months

C. 4 months D. 6 months E. 7 months


The correct answer is B. Neuromuscular development is sufficient to allow fetal movement in the

eighth week of life. Other features of Week 8 include the first appearance of a thin skin, a head as

large as the rest of the body, forward-looking eyes, appearance of digits on the hands and feet,

appearance of testes and ovaries (but not distinguishable external genitalia), and a crown-rump length

of approximately 30 mm. By the end of the eighth week, nearly all adult structures have at least begun to 

develop, and the fetus "looks like a baby." 

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73. Mosquito borne transmission appears to be the method of spread in:

a. St. Louis encephalitis   b. Histoplasmosis

c. Typhus  d. Toxoplasmosis

ANS.  A



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