Left pectoralis major · abdominal part

One portion of a larger muscle

The abdominal portion is the lower indexed component of pectoralis major, not an abdominal-wall muscle replacing rectus abdominis.

The three components use separate original source objects. No division has been inferred from color or created by cutting a whole-muscle mesh.

Sources: BodyParts3D

Attachment orientation

The abdominal contribution is associated with the upper rectus sheath; that sheath is not separately modeled.

Pectoralis major spans from the medial clavicle, sternum, upper costal cartilages and sometimes upper abdominal sheath to the crest of the greater tubercle of the humerus.

These are broad anatomical landmarks, not exact footprints on this mesh. Open the whole-body view to compare the clavicle and humerus; those upper-limb bones are not duplicated in this chest subset.

Sources: Texas Tech University Health Sciences Center El Paso · BodyParts3D

Function of the whole muscle

The muscle contributes to arm flexion, adduction and medial rotation. These functions describe anatomy; this static viewer does not simulate contraction or the independent force of each portion.

Sources: Texas Tech University Health Sciences Center El Paso

Study the chest framework

Use Show context and Fade others to compare this part with the ribs, sternum and loaded costal cartilages. Search for pectoralis major to compare its six source objects.

Pectoralis minor and serratus anterior are also available on both sides. Select them through the structure search and use Fade others to inspect their relationship to the larger chest muscle.

Sources: BodyParts3D

Read the model

Explore left pectoralis major · abdominal part in 3D

1. Inspect this portion. Rotate it in isolation, then restore context.
2. Compare the same side. Open another pectoralis portion below and compare source boundaries.
3. Study the upper-limb relationship. Use the whole-body view for clavicle and humerus context. Human body →

Sources and editorial status

This guide uses independently written explanations with links to the evidence behind them. Source checking and specialist anatomical review are separate steps; the latter is still pending.

1. Anatomy tables · Pectoral region

   Broad pectoralis major attachments and actions. Independent factual summary, not a part-specific attachment reconstruction.

2. BodyParts3D / DBCLS · IS-A source index

   FMA45875 / FJ1446M: indexed left abdominal portion; no mirroring.

3D geometry and its separate license are credited beneath the viewer. References do not imply endorsement of this site.