I.D.1 Shoulder & Arm: Skeletal Structures: Shoulder, Axilla, Arm, & Elbow

I.D.1 Shoulder & Arm: Skeletal Structures: Shoulder, Axilla, Arm, & Elbow: Page 4 of 5

As you add the following muscles, study how they coordinate to allow the upper extremity to move:

	Step 12: Add the rhomboid major.
	Step 13: Add the rhomboid minor.
	Step 14: Add the levator scapulae.
	Step 15: Add the superior part of trapezius.
	Step 16: Add the middle part of trapezius.
	Step 17: Add the inferior part of trapezius.
	Step 18: Add the spinal part of deltoid.

All of these muscles elevate the scapula and the glenohumeral joint.

	What would elevating the medial and superior portions of the scapula accomplish?
The humerus can then abduct beyond the 15 degrees that was initially accomplished by the suprapinatus muscle.