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Physical Therapy Tool

Brachial Plexus Muscle Visualizer

Select a muscle to view its origin, insertion, action, innervation, nerve roots, and a highlighted brachial plexus pathway.

Selected muscle

Deltoid

C5 / C6

Abducts, flexes, extends, internally rotates, and externally rotates the shoulder depending on fiber region.

Nerve
Axillary nerve
Branch type
Terminal branch
Region
Shoulder
Roots
C5, C6
Active nerve route
Yellow = selected root contribution and pathway to the selected muscle.
C5C6C7C8T1
RootsTrunksCordsBranchMuscleC5C6C7C8T1UpperC5–C6MiddleC7LowerC8–T1LateralcordPosteriorcordMedialcord
Axillary nerve
Terminal branch
Muscle
Deltoid
Shoulder
Origin
Lateral third of clavicle, acromion, and spine of scapula
Insertion
Deltoid tuberosity of humerus
Action
Abducts, flexes, extends, internally rotates, and externally rotates the shoulder depending on fiber region.
Innervation
Axillary nerve
C5C6C7C8T1
Clinical anatomy note

This is designed as a high-yield study visualizer, not a surgical atlas. Root levels and minor branch patterns can vary by source and by person. The list includes the major skeletal muscles supplied by motor branches of the brachial plexus, including shoulder girdle, arm, forearm, and intrinsic hand muscles.