Superficial Back Muscles (Division, Origin, Insertion, Function)

Content
0:00 Introduction
0:09 Division of the Superficial Muscles
0:43 Trapezius
2:04 Latissimus Dorsi
2:55 Rhomboid Major
3:13 Rhomboid Minor
3:33 Levator Scapulae
3:58 Serratus Posterior Superior
4:20 Serratus Posterior Inferior

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Superficial Muscles of the Back
- Muscles of the 1st Layer
○ Trapezius
○ Latissimus dorsi
- Muscles of the 2nd Layer
○ Rhomboid Major
○ Rhomboid Minor
○ Levator Scapulae
- Muscles of the 3rd Layer
○ Serratus Posterior Superior
○ Serratus Posterior Inferior

Trapezius
musculus trapezius
- Superior Part
Origin:
- Superior Nuchal Line
- External Occipital Protuberance
- Nuchal Ligament
Insertion:
- Acromial end of clavicle
- Acromium of Scapula
- Middle Part
○ Origin: Spinous Process of C7-T3/T4
○ Insertion: Spine and Acromium of Scapula
- Inferior Part
○ Origin: Spinous Process of T4-T12
○ Insertion: Spine of Scapula

Latissimus dorsi
Musculus latissimus dorsi
- Origin:
Spinous Process of T7-T12
Thoracolumbar Fascia
Iliac Crest
Inferior surface of ribs 9-12
Inferior angle of Scapula
- Insertion: Crest of Lesser Tubercle (Humerus)
Crista tuberculi minoris humeri

Rhomboid Major
musculus rhomboideus major
- Origin: Spinous Process of T1-T4
- Insertion: Lower 2/3 of Medial Border of Scapula
margo medialis scapulae
- Function:
Elevates and retracts the scapula
Internal rotation of the scapula
-

Rhomboid Minor
musculus rhomboideus minor
- Origin: Spinous Process of C6-C7
- Insertion: Upper 1/3 of Medial Border of Scapula
margo medialis scapulae
- Function:
Elevates and retracts the scapula
Internal rotation of the scapula

Levator Scapulae
musculus levator scapulae
- Origin: Spinous Process of C1-C4
- Insertion: Superior Angle of Scapula
angulus superior scapulae
- Function:
Elevates the Scapula
-

Serratus Posterior Superior
Musculus serratus posterior superior
- Origin: Spinous Process of C6-T2
- Insertion: External Surface of 2nd-5th Ribs
- Function:
Elevates the Ribs (Inspiration)

Serratus Posterior Inferior
Musculus serratus posterior inferior
- Origin: Spinous Process of T11-L2
- Insertion: External Surface of 9th-12th Ribs
- Function:
Pulls the ribs downward (expiration)