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The atlas is also known as the

vertebrae.
Answer and Explanation

The Correct Answer is {"dropdown-group-1":"C"}

Rationale:
A. C2 refers to the axis, the second cervical vertebra, which allows rotation of the head.
B. T1 is the first thoracic vertebra, located in the upper back, not the cervical region.
C. The atlas is the first cervical vertebra and supports the skull, allowing nodding movements of the head (as in “yes”). It articulates with the occipital condyles of the skull and works in conjunction with the axis (C2) to facilitate head rotation.
D. L5 refers to the fifth lumbar vertebra, located in the lower back, not the cervical region.


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Related Questions

Correct Answer is C

Explanation

Rationale:
A. Canaliculi are tiny channels that connect osteocytes in lacunae, allowing nutrient and waste exchange, but they do not provide structural strength.
B. Lamellae are concentric layers of bone matrix in compact bone that contribute to bone strength but are not the primary feature of spongy bone.
C. Trabeculae; Spongy bone consists of a network of trabeculae—interconnected, lattice-like structures—that provide strength while minimizing weight. This arrangement allows the bone to withstand stress from multiple directions without being excessively heavy.
D. Lacunae are small spaces housing osteocytes; while essential for bone cell survival, they do not contribute directly to the structural strength of spongy bone.

Correct Answer is A

Explanation

Rationale:
A. The shoulder joint (glenohumeral joint) is the most mobile joint in the body, allowing a wide range of motion. Its shallow socket and relatively weak ligament support make it more susceptible to dislocation.
B. Knee is a strong hinge joint stabilized by ligaments and muscles, making dislocations less common than in the shoulder.
C. Hip is a deep ball-and-socket joint with strong ligaments and surrounding muscles, making dislocation rare except in severe trauma.
D. Elbow is a hinge joint with strong ligamentous support, so dislocations are less frequent compared to the shoulder.

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