Question

multiple choice question

the largest muscle of the neck extensor group is what?

trapezius
splenius cervicis
splenius capitis

Explanation:

Identify the neck extensor muscles

The question asks for the largest muscle of the neck extensor group. The options provided are:

• Trapezius
• Splenius cervicis
• Splenius capitis

Analyze the role of each muscle

Using the Trapezius Muscle Anatomy knowledge point

• The trapezius is a large, superficial muscle extending longitudinally from the occipital bone to the lower thoracic vertebrae and laterally to the spine of the scapula. While its upper fibers can assist in extending the neck when the scapula is fixed, it is primarily classified as a muscle of the shoulder girdle and back.
• The splenius capitis and splenius cervicis are intrinsic muscles of the neck specifically grouped as neck extensors. Among the intrinsic neck extensors (which include splenius capitis, splenius cervicis, semispinalis capitis, and longissimus capitis), the splenius capitis is a broad, strap-like muscle located on the back of the neck.
• However, when considering the muscles that act to extend the neck, the trapezius is by far the largest muscle in terms of overall mass and surface area that participates in this action. In standard anatomical and kinesiological classifications, the trapezius is identified as the largest muscle of the neck extensor group.

Confirm the correct option

The trapezius is the largest muscle that extends the neck.

Answer:

• Trapezius (Correct answer)
• Splenius cervicis
• Splenius capitis