Muscles Of The Superficial Back

Front 1

Trapezius

Back 1

O: Med 1/3 of Sup nuchal line, ext occipital protuberance, ligamentum nuchae, S-process of C7, S-process of T1-T12
I: U- Post Lat 1/3 of clavicle; M- acromion and spine of scapula; L- Med end of spine of scapula
A: U- elevate scapula; M- adduct scapula; L- depress scapula; assist SA in upward rotation of scapula
N: Accessory n. (CN XI); Roots of C3 and C4

Front 2

Latissimus Dorsi

Back 2

O: S-processes of T7-T12, lumbar fascia, Post 1/3 of iliac crest, ribs 9-12
I: Floor of intertubercular groove
A: Extends, Adducts, IR humerus
N: Thoracodorsal n.

Front 3

Levator Scapulae

Back 3

O: T-processes of C1-C3
I: Med border of scapula (Sup to spine)
A: Elevates scapula; draws scapula Med and rotates it down; Extends and Lat Flexes neck when scapula fixed
N: Dorsal Scapular n.; Roots of C3 and C4

Front 4

Rhomboid Minor

Back 4

O: Ligamentum nuchae; S-processes of C7 and T1; supraspinous ligament
I: Med border of scapula (at root of the spine)
A: Elevates Med border and Adducts scapula
N: Dorsal Scapular n.

Front 5

Rhomboid Major

Back 5

O: S-processes of T2-T5; supraspinous ligament
I: Med border of scapula (Inf to spine)
A: Elevates Med border and Adducts scapula
N: Dorsal Scapular n.