Lesson 4 - Muscles of the Back

Extrinsic back muscles move

Upper limbs

Intrinsic back muscles (deep back muscles) are attached to

Vertebral column

Examples of Extrinsic Back Muscles

Trapezius, Latissimus Dorsi, Levator Scapulae, Rhombid Minor/Major, Serratus Posterior Superior/Inferior

Extrinsic vs. Intrinsic Depth

Superficial vs. Deep

Extrinsic vs. Intrinsic Function

Move upper limb vs. move vertebral column

Extrinsic vs. Intrinsic Innervation

Anterior rami vs. posterior rami

Most superficial Extrinsic Back Muscles

Trapezius and Latisimus Dorsi

Next layer of Extrinsic Back Muscles after Trapezius and Latissimus Dorsi

Levator Scapulae, Rhomboid Minor, Rhomboid Major

Intermediate level of Extrinsic Back Muscles

Serratus Posterior Superior, Serratus Posterior Inferior

What are the Intrinsic Back Muscles

Erector Spinae, Tranversospinales Group, Segmental Group

Trapezius and Latissimus Dorsi

Levator Scapulae, Rhomboid Minor, Rhomboid Major

Serratus Posterior Superior and Serratus Posterior Inferior

Location of Serratus Posterior Superior

Spinous Processes → Ribs, High Cs to Low Ts (C7-T2)

Location of Serratus Posterior Inferior

Spinous Processes → Ribs, High Ts to Low Ls (T11-L2)