Muscles of the Back

Question 1

Trapezius

Answer 1

O: Cervical and thoracic vertebrae

I: Distal clavicle, multiple sites on scapula

A: Moves scapula

N: Accessory (XI)

Question 2

Latissimus Dorsi

Answer 2

O: Thoracic, lumbar, and sacral vertebrae; iliac crest

I: Humerus

A: Rotates arm, adducts, extends

N: Thoracodorsal (C6-C8), from posterior portion of brachial plexus

Question 3

Levator Scapulae

Answer 3

O: Cervical Vertebrae

I: Scapula - superior, medial border

A: Elevates and adducts scapula

N: Dorsal scapular (C5-C6), from brachial plexus

Question 4

Rhomboid Minor

Answer 4

O: Thoracic Vertebrae

I: Scapula - medial border

A: Elevates and adducts scapula

N: Dorsal scapular (C5-C6), from brachial plexus

Question 5

Rhomboid Major

Answer 5

O: Thoracic Vertebrae

I: Scapula - medial border

A: Elevates and adducts scapula

N: Dorsal scapular (C5-C6), from brachial plexus

Question 6

Subscapularis

Answer 6

O: Subscapular fossa

I: Lesser tubercle of humerus

A: Rotates medially (IR)

N: C5, C6

Question 7

Infraspinatus

Answer 7

O: Infraspinatus fossa

I: Greater tubercle of humerus

A: Lateral rotation (ER)

N: C5, C6

Question 8

Teres Minor

Answer 8

O: Posterior scapula

I: Greater tubercle of humerus

A: Lateral rotation (ER)

N: C5, C6

Question 9

Supraspinatus

Answer 9

O: Supraspinatus fossa

I: Greater tubercle of humerus

A: Abduction

N: C5, C6

Question 10

Levatores Costarum, Serratus posterior superior, Serratus posterior inferior

Answer 10

O: Vertebrae

I: Ribs

A: Respiration

N: Doral rami of thoracic spinal nerves (Levatores costarum)
    Intercostal nerves (serratus muscles)

Question 11

Splenius

Answer 11

O: Vertebrae

I: Occipital and temporal bones; transverse processes

A: Extend neck and head

N: Dorsal rami of thoracic spinal nerves