The muscle colored blue in the illustration above (from Visible Body) is the right Splenius capitis muscle. This muscle does the action of lateral flexion to the right (when concentrically contracting).

(note this muscle is a neck muscle that attaches on the base of the skull)

Question

The muscle colored blue in the illustration above (from Visible Body) is the right Splenius capitis muscle. This muscle does the action of lateral flexion to the right (when concentrically contracting).

(note this muscle is a neck muscle that attaches on the base of the skull)

BlackTom AI · Accepted Answer

The question describes the blue-colored muscle as the right Splenius capitis and states its action as lateral flexion to the right when concentrically contracting, noting its attachment at the base of the skull.

Option 1: Splenius capitis. This is correct because the muscle being identified is indeed the right Splenius capitis, a deep neck muscle that extends from the upper thoracic and lower cervical vertebrae to the occipital bone and mastoid process. Its primary actions include head and neck extension, as well as ipsilateral lateral flexion and rotation when contracting unilaterally. The description aligns with the label provided in the prompt.

Option 2: lateral flexion to the right. This is also correct as the unilateral contraction of the Splenius capitis produces lateral flexion of the head and neck toward the same side (the right side in this case). The prompt explicitly states this action, so selecting this option matches the described movement.

Why there aren’t alternative explanations here: the prompt focuses on a single muscle and its specific action on the right side. Since only two options are given as the expected selections, both align with the described anatomy and biomechanics: the muscle identity (Splenius capitis) and the motion (lateral flexion to the right).

In summary, the correct pair corresponds to the muscle name and its named functional action as described: Splenius capitis, and lateral flexion to the right. If you were to test understanding further, you could consider how the right unilateral contraction would combine with neck rotation and how antagonists like the sternocleidomastoid would influence overall neck movement.

2025FA-HES-207-001 B. ONQ#9AJ/Trunk

The muscle colored blue in the illustration above (from Visible Body) is the right Splenius capitis muscle. This muscle does the action of lateral flexion to the right (when concentrically contracting). (note this muscle is a neck muscle that attaches on the base of the skull)

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