Superficial Back Musculature

Question 1

What muscles are associated with the five muscle layers of the true back?

Answer 1

• layer one: trapezius and latissimus dorsi
• layer two: rhomboid major and minor, levator scapulae
• layer three: serratus posterior superior and inferior
• layer four: erector spinae
• layer five: transversospinalis

Question 2

Which of the muscles attaching to the spinous processes represent layer one?

Answer 2

• trapezius

- latissimus dorsi

Question 3

Which of the muscles attaching to the spinous processes represent layer two?

Answer 3

• rhomboid major

- rhomboid minor

Question 4

Which of the muscles attaching to the transverse processes represent layer two?

Answer 4

levator scapulae

Question 5

Which of the muscles attaching to the scapula represent layer two?

Answer 5

• levator scapulae
• rhomboid major
• rhomboid minor

Question 6

Which of the muscles attaching to the humerus represent layer one?

Answer 6

latissimus dorsi

Question 7

Which of the muscles attaching to the lateral mass of C1 represent layer two?

Answer 7

levator scapulae

Question 8

Which of the muscles in layer one acts to extend and laterally flex the head and neck and bilaterally acts to extend the head and neck?

Answer 8

trapezius

Question 9

Which of the muscles in layer two acts to laterally flex and rotate the neck and bilaterally acts to extend the neck?

Answer 9

levator scapulae

Question 10

Which of the muscles in layer one acts solely on the humerus?

Answer 10

latissimus dorsi

Question 11

Which of the muscles in layer two acts solely on the scapula?

Answer 11

• rhomboid major

- rhomboid minor

Question 12

Which of the muscles of the true back is innervated by the spinal accessory nerve?

Answer 12

trapezius

Question 13

What forms the spinal accessory nerve?

Answer 13

C1-C5 cord levels contribute to the spinal root

Question 14

Which of the muscles of the true back is innervated by the thoracodorsal nerve?

Answer 14

latissimus dorsi

Question 15

What forms the thoracodorsal nerve?

Answer 15

ventral rami from C6-C8

Question 16

Which of the muscles of the true back are innervated by the dorsal scapular nerve?

Answer 16

• levator scapulae
• rhomboid major
• rhomboid minor

Question 17

What forms the dorsal scapular nerve?

Answer 17

the ventral ramus of C5

Question 18

The levator scapula is innervated by what nerves?

Answer 18

• dorsal scapular nerve (ventral ramus of C5)

- branches from C3, C4 ventral rami

Question 19

The rhomboid major is innervated by what nerves?

Answer 19

• dorsal scapular nerve (ventral ramus of C5)

- branches from C4 ventral ramus

Question 20

The rhomboid minor is innervated by what nerves?

Answer 20

• dorsal scapular nerve (ventral ramus of C5)

- branches from C4 ventral ramus