The muscle labelled #1 is the
[ Select ]
spleneus capitis
Splenius cervicis
Sternocleidomastoid
Erector spinae
and the muscle labelled #2 is the
[ Select ]
Rectus abdominis
External oblique
Internal oblique
Quadratus lumborum
.

Question

The muscle labelled #1 is the 
[ Select ]
spleneus capitis
Splenius cervicis
Sternocleidomastoid
Erector spinae
 and the muscle labelled #2 is the  
[ Select ]
Rectus abdominis
External oblique
Internal oblique
Quadratus lumborum
 .

BlackTom AI · Accepted Answer

We start by identifying the two muscles based on typical anatomical positions and functions described in the options.

Option group for muscle #1:
- Sternocleidomastoid: This muscle runs from the sternum and clavicle up to the mastoid process of the skull. It is a prominent neck muscle that flexes the head when both sides contract and rotates the head when acting unilaterally. Given its location and role, it is a likely candidate for a labeled neck muscle in an image.
- Splenius capitis: This muscle is located in the posterior neck, extending from the upper thoracic spine to the skull, and it mainly extends or rotates the head when activated. If the image is highlighting a superficial anterior neck muscle, splenius capitis is less consistent with a primary action of flexion or prominent anterior placement.
- Splenius cervicis: This is a deep neck muscle primarily involved in head and neck extension and rotation, situated more deeply than the sternocleidomastoid. Its position makes it a less common choice for a clearly labeled superficial neck muscle in standard diagrams.
- Erector spinae: A large posterior chain of muscles along the spine, responsible for back extension and posture. It is not typically the labeled muscle in the anterior neck region.

Option group for muscle #2:
- Internal oblique: Located in the anterolateral abdominal wall, this muscle lies beneath the external oblique and above the transversus abdominis. It contributes to trunk flexion and rotation, and forms part of the lateral abdominal wall, making it a common choice for a labeled abdominal muscle in diagrams.
- Rectus abdominis: A vertical, paired muscle running along the anterior abdominal wall, responsible for trunk flexion. While a key abdominal muscle, it is more medial and superficial compared to the obliques, which are often labeled as the lateral abdominal muscles in diagrams.
- External oblique: The superficial lateral abdominal muscle, forming the outer layer of the abdominal wall. It is a frequent label in diagrams but sits outermost, not the deepest layer shown in many images.
- Quadratus lumborum: A posterior abdominal wall muscle contributing to lateral flexion of the trunk and stability of the pelvis. It lies higher and more posteriorly than the obliques, and is less commonly labeled as a primary abdominal wall muscle in standard frontal diagrams.

Putting it together:
- For muscle #1, the Sternocleidomastoid is the most likely candidate among the options due to its prominent anterior neck location and its primary actions related to head flexion and rotation, which align with a visible, clearly labeled neck muscle in many educational images.
- For muscle #2, the Internal oblique matches the description of a lateral abdominal wall muscle that is commonly labeled in abdominal diagrams, fitting a position beneath the external oblique and contributing to trunk movement and stability.

If you compare the remaining options, you can see their typical anatomical positions and functions make them less likely matches for the two labeled muscles in a standard diagram: the splenius muscles are more posterior/deep neck muscles, the rectus abdominis is a vertical medial muscle, the external oblique is the outer lateral muscle, and the quadratus lumborum is a posterior-lateral hip-back muscle. Hence, the selections provided (Sternocleidomastoid for #1 and Internal oblique for #2) align best with common anatomical labeling in educational visuals.

2025FA-HES-207-001 A. Exam #3B - no lockdown

The muscle labelled #1 is the [ Select ] spleneus capitis Splenius cervicis Sternocleidomastoid Erector spinae and the muscle labelled #2 is the [ Select ] Rectus abdominis External oblique Internal oblique Quadratus lumborum .

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