Back muscles

[JM7]

Are rhomboids & levator scapulae "superficial extrinsic back muscles" or "intermediate extrinsic back muscles"???? Is there a difference between "intermediate extrinsic back muscles" and "deep extrinsic back muscles"????

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[JM7]

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[Jo23]

Are rhomboids & levator scapulae "superficial extrinsic back muscles" or "intermediate extrinsic back muscles"???? Is there a difference between "intermediate extrinsic back muscles" and "deep extrinsic back muscles"????

The 3 groups of back muscles are organized in layers: superficial, intermediate, and deep.
Muscles of the superficial and intermediate groups are called extrinsic back muscles because they are involved in respiration and movements of the upper extremity. Muscles of the deep group are called intrinsic back muscles because they are involved in movement and stabilization of the vertebral column.
Superficial layer:
-trapezius
-latissimus dorsi
-levator scapulae
-rhomboid major+minor

Intermediate layer:
-serratus

Deep:
-errector spinae
-transversospinalis
-splenius
-suboccipital muscles

Hope this helps.

 

[JM7]

The 3 groups of back muscles are organized in layers: superficial, intermediate, and deep.
Muscles of the superficial and intermediate groups are called extrinsic back muscles because they are involved in respiration and movements of the upper extremity. Muscles of the deep group are called intrinsic back muscles because they are involved in movement and stabilization of the vertebral column.
Superficial layer:
-trapezius
-latissimus dorsi
-levator scapulae
-rhomboid major+minor

Intermediate layer:
-serratus

Deep:
-errector spinae
-transversospinalis
-splenius
-suboccipital muscles

Hope this helps.

thanks for the reply. rhomboids major+minor are underneath trapezius. Aren't they part of the intermediate layer? I still think "deep extrinsic" is the same as "intermediate extrinsic." What does everyone else think?

 

[JM7]