Anatomio

Left side · Muscle · 3D study

Left trapezius · ascending part

Inspect the ascending component of the left trapezius. Three separately selectable source objects on each side represent portions of one muscle, not three independent muscles.

Atlas noteOriginal-source surface geometry; colors are illustrative. This partial study has not yet received specialist anatomical review.
LEFT SIDE · STRUCTURE STUDYBodyParts3D / 4.0
SELECTED · LEFT SIDE

Left trapezius · ascending part

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Anatomioanatomio.org ↗3D: BodyParts3D / DBCLS · CC BY 4.0

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* Partial trunk model: thoracic and lumbar spine, sacrum, ribs, sternum parts, hip bones, selected muscles and 14 indexed costal cartilages. Discs, cervical spine, coccyx and organs are not included.

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Interactive study: Anatomio. Original geometry: BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International. Sources & changes · Model provenance

Educational draft · anatomical review pendingSources checked . Prepared with AI assistance; not yet reviewed by a qualified anatomist. Not for diagnosis or treatment.
Region
Back
Side
Left
Portion
Ascending
Source
FMA33583 / FJ1520M

Identify this source portion

Compare the lower, ascending component with the transverse component above it.

Use Back to follow this source surface toward the scapular region. The word ascending identifies a portion, not an animated motion.

The portion names and sides follow the BodyParts3D index. Their boundaries are original source boundaries; Anatomio has not cut a whole-muscle mesh or generated an opposite-side mirror.

Sources: BodyParts3D / DBCLS

Landmarks of the whole trapezius

Trapezius connects the posterior skull, nuchal ligament and C7–T12 spinous processes with the lateral clavicle, acromion and scapular spine.

These landmarks describe the muscle as a whole. They do not assign every attachment to this selected portion or mark exact footprints on its surface. Open the human overview for the loaded clavicles and scapulae; skull, cervical spine and nuchal ligament are not yet modeled here.

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

Scapular action and innervation

Different parts contribute to scapular elevation, depression and retraction; together they also participate in upward rotation. Motor supply is through the spinal accessory nerve; cervical contributions convey proprioceptive information.

The static model illustrates position and shape, not contraction. Selecting one portion does not simulate its isolated force, fiber direction or nerve distribution.

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

Compare the three portions

Search for trapezius in the model to find all six source objects. Start with the three on one side, then compare the corresponding portion on the opposite side. Isolate shows only the selection; Show context restores the available assembly.

The back study now includes these six portions and four rhomboids with the thoracic and lumbar spine and sacrum. Other back muscles and soft tissues are not loaded; gaps in this partial assembly should not be interpreted as normal anatomical openings.

Sources: BodyParts3D / DBCLS

Read the model

Explore left trapezius · ascending part in 3D

  1. Inspect the portion. Use Back to follow this source surface toward the scapular region. The word ascending identifies a portion, not an animated motion.
  2. Compare the same side. Use the related links for the other two source portions and compare their boundaries.
  3. Restore the shoulder girdle. Use the human overview for scapula and clavicle 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 · Superficial back

    Whole trapezius: attachment landmarks, scapular actions and innervation. Independent factual summary, not a reconstruction of individual-portion footprints.

  2. BodyParts3D 4.0 · IS-A source index

    FMA33583 / FJ1520M: independently indexed left ascending portion; complete original geometry retained.

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

Source identification

About this model

BodyParts3D identifies this surface as left trapezius · ascending part: FMA33583 / FJ1520M. Its original coordinates and topology are preserved. Anatomical sides refer to the body, not the screen.

The trunk assembly includes thoracic and lumbar vertebrae, sacrum, ribs, sternum parts, hip bones, selected muscles and 14 indexed costal cartilages. Discs, cervical vertebrae, coccyx, organs and other trunk muscles are not loaded.

Back to Trunk →