Question1.7 Which ONE of the following is a unique feature of the Axis (C2)? Posterior tubercle Facet for the dens (fovea dentis) Large transverse processes Lateral Mass Odontoid process ResetMaximum marks: 1 Flag question undefined单项选择题
A
Posterior tubercle
B
Facet for the dens (fovea dentis)
C
Large transverse processes
D
Lateral Mass
E
Odontoid process

Question

Question1.7 Which ONE of the following is a unique feature of the Axis (C2)? Posterior tubercle Facet for the dens (fovea dentis) Large transverse processes Lateral Mass Odontoid process ResetMaximum marks: 1 Flag question undefined单项选择题

A

Posterior tubercle

B

Facet for the dens (fovea dentis)

C

Large transverse processes

D

Lateral Mass

E

Odontoid process

BlackTom AI · Accepted Answer

Question1.7 asks for a unique feature of the Axis (C2). Each option is evaluated to see whether it is characteristic of C2, and whether it is unique to this vertebra.
Option 1: Posterior tubercle. The posterior tubercle is a feature commonly associated with the posterior arch of many cervical vertebrae or the atlas region, but it is not a distinctive or unique feature of the axis (C2). Therefore, this option does not correctly identify a unique attribute of C2.
Option 2: Facet for the dens (fovea dentis). The facet for the dens is a joint surface involved in the articulation between the atlas (C1) and the dens/odontoid process of C2. While it is anatomically related to C2, this facet is not a feature of C2 itself; rather, it lies on C1 to accommodate the dens of C2. Thus, this option is not a unique feature of the axis.
Option 3: Large transverse processes. The transverse processes of the axis exist, but the size description here is not recognized as a defining or unique hallmark of C2. Other cervical vertebrae can have transverse processes, and this trait is not distinctive enough to identify C2 specifically.
Option 4: Lateral Mass. Lateral masses are characteristic of the atlas (C1), not the axis (C2). Since this feature is not associated with C2, it is not correct as a unique feature of the axis.
Option 5: Odontoid process. The odontoid process, also known as the dens, is the defining and unique feature of the axis (C2). It projects upward from the body of C2 and forms a pivotal articulation with the atlas, enabling the rotation of the head. This dens/odontoid process is the hallmark that distinguishes C2 from other cervical vertebrae, making it the correct feature described by the question.

Question1.7 Which ONE of the following is a unique feature of the Axis (C2)? Posterior tubercle Facet for the dens (fovea dentis) Large transverse processes Lateral Mass Odontoid process ResetMaximum marks: 1 Flag question undefined单项选择题

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