SCIENCE
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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cervical
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axis
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atlas
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axon
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Detailed explanation-1: -The second cervical vertebra, the axis (C2), is the largest and heaviest cervical segment. The C2 vertebra arises from five or six separate ossification centers, depending on whether the centrum has one or two centers. The vertebral body is ossified at birth, and the posterior arch is partially ossified.
Detailed explanation-2: -Axis: The axis is the second cervical vertebra (symbol: C2). It is called the “axis” because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of C2. The joint between the axis and atlas is a pivot type of joint. It allows the head turn.
Detailed explanation-3: -The axis (C2) is unique with an odontoid process (the dens) projecting from its superior surface. The vertebra prominens (C7) has the longest spinous process of all cervical vertebrae. It is also non-bifid. These features give rise to its name.
Detailed explanation-4: -Axis (C2) The Axis is the second cervical vertebra or C2. It is a blunt tooth–like process that projects upward. It is also referred to as the ‘dens’ (Latin for ‘tooth’) or odontoid process.