Superficial Back Muscles

Question 1

Latissimus Dorsi (attachments)

Answer 1

From lower thoracic spinous processes, thoracolumbar fascia & iliac crest to the floor of the intertubercular sulcus of the humerus

Question 2

Latissimus Dorsi (action)

Answer 2

Adduction, extension & IR of humerus

Question 3

Latissimus Dorsi (innervation)

Answer 3

Thoracodorsal n. (C6-8)

Question 4

Levator Scapulae (attachments)

Answer 4

From transverse processes of C1-4 to the superior angle & superomedial border of scapula

Question 5

Levator Scapulae (actions)

Answer 5

Elevation & downward rotation of scapula

Question 6

Levator Scapulae (innervation)

Answer 6

Dorsal scapular n. (C4-5)

Sensory: direct branches of C3-4

Question 7

Pectoralis Major (attachments)

Answer 7

From clavicle, costal cartilages, sternum & aponeurosis of the external oblique to lateral lip of intertubercular sulcus of humerus

Question 8

Pectoralis Major (actions)

Answer 8

Humeral adduction, flexion, IR

Sternocostal portion assists w/ extension of flexed arm

Question 9

Pectoralis Major (innervation)

Answer 9

Medial & lateral pectoral n.
(Clavicular head: C5-6
Sternocostal head: C7-T1)

Question 10

Pectoralis Minor (attachments)

Answer 10

From outer surfaces of ribs 3-5 to the coracoid process

Question 11

Pectoralis Minor (actions)

Answer 11

Anterior tilt of scapula, assists w/ depression of shoulder & forced inspiration

Question 12

Pectoralis Minor (innervation)

Answer 12

Medial & lateral pectoral nerves (C5-T1)

Question 13

Rhomboids (attachments)

Answer 13

Major: from spinous processes T2-5
Minor: from ligamentum nuclear & spinous processes C7-T1

to medial border of scapula

Question 14

Rhomboids (actions)

Answer 14

Scapular retraction, elevation (upper) & downward rotation

Question 15

Rhomboids (innervation)

Answer 15

Dorsal scapular n. (C4-5)

Sensory: direct branches of C3-4

Question 16

Serratus Anterior (attachments)

Answer 16

From the outer surfaces & superior borders of upper 8-10 ribs to the costal surface of medial border of scapula

Question 17

Serratus Anterior (actions)

Answer 17

Scapular protraction & upward rotation

Question 18

Serratus Anterior (innervation)

Answer 18

Long thoracic n. (C5-7)

Question 19

Subclavius (attachments)

Answer 19

From 1st rib & cartilage to undersurface of the clavicle

Question 20

Subclavius (actions)

Answer 20

Depresses & stabilizes clavicle

Question 21

Subclavius (innervation)

Answer 21

Subclavian n. (C5-6)

Question 22

Trapezius (attachments)

Answer 22

From the superior nuchal line, external occipital protuberance, ligamentum nuchae, cervical & thoracic spinous processes to the clavicle, acromion & scapular spine

Question 23

Trapezius (actions)

Answer 23

Upper: scapular elevation, upward rotation
Lower: depression, upward rotation
Middle: retraction

Question 24

Trapezius (innervation)

Answer 24

Accessory n. (CN XI; motor) & C3-4 (sensory)

Question 25

Latissimus Dorsi (attachments)

Answer 25

From lower thoracic spinous processes, thoracolumbar fascia & iliac crest to the floor of the intertubercular sulcus of the humerus

Question 26

Latissimus Dorsi (action)

Answer 26

Adduction, extension & IR of humerus