Out of ‘X’ serially arranged units of vertebrae in humans only ‘Y’ and ‘Z’ are fused units. Select the option that correctly represents the value of X and provides Y and Z explanation.
X Y Z
1) 26 sternum coccyx Three bones are fused to form sternum and four caudal vertebrae are fused to form coccyx
2) 26 sacrum coccyx Five sacral vertebrae and four coccygeal vertebrae are fused to form sacrum and coccyx.
3) 33 coccyx sacrum Five caudal vertebrae and four sacral vertebrae are fused to form coccyx and sacrum
4) 33 cervicum sacrum Seven cervical vertebrae and four sacral vertebrae are fused to form cervicum and sacrum.

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answer is B.

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Detailed Solution

X = 26, Y = Sacrum, formed by the fusion of five sacral vertebrae. Z = Coccyx, formed by the fusion of four coccygeal vertebrae.

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	X	Y	Z
1)	26	sternum	coccyx	Three bones are fused to form sternum and four caudal vertebrae are fused to form coccyx
2)	26	sacrum	coccyx	Five sacral vertebrae and four coccygeal vertebrae are fused to form sacrum and coccyx.
3)	33	coccyx	sacrum	Five caudal vertebrae and four sacral vertebrae are fused to form coccyx and sacrum
4)	33	cervicum	sacrum	Seven cervical vertebrae and four sacral vertebrae are fused to form cervicum and sacrum.