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Flashcards in Back muscles attachments Deck (48)
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1

What are the muscles of the back divided into? (2)

1. superficial (extrinsic)
2. deep (intrinsic)

2

What are the extrinsic muscles of the back innervated by?

ventral rami of spinal nerves

accessory nerve

3

What are the extrinsic muscles divided into?

superficial and intermediate groups

4

What are the muscles in the superficial group of extrinsic back muscles?

1. rhomboid major and minor
2. levator scapulae
3. trapezius
4. latissimus dorsi

5

What is the origin of rhomboid major?

spinous process of TIII to TV

6

What is the insertion of rhomboid major?

medial border of scapula between spine and inferior angle

7

What is the innervation of rhomboid major?

dorsal scapular nerve

8

What is the function of rhomboid major?

1. retracts (adducts)

2. elevates scapula

9

What is the origin of rhomboid minor?

1. the lower portion of ligamentum nuchae
2. spinous processes of CVII and TI

10

What is the insertion of rhomboid minor?

medial border of scapula at spine of scapula

11

What is the innervation of rhomboid minor?

dorsal scapular nerve (C4,C5)

12

What is the function of rhomboid minor?

1. retracts (adducts)
2. elevates scapula

13

What is the origin of levator scapulae?

transverse processes of CI to CIV

14

What is the insertion of levator scapulae?

upper portion of medial border of scapula

15

What is the innervation of levator scapulae?

1. C3 to C4

2. dorsal scapular nerve

16

What is the function of levator scapulae?

elevates scapula

17

What is the origin of trapezius?

1. superior nuchal line
2. external occipital protuberance
3. ligamentum nuchae
4. spinous processes of CVII to TXII

18

What is the innervation to trapezius?

motor

1. accessory nerve

proprioception

1. C3 and C4

19

What is the function of trapezius?

1. assists in rotating the scapula during abduction of the humerus above horizontal
2. upper fibres - elevate
3. middle fibres - adducts
4. lower fibres - depress scapula

20

What is the origin of latissimus dorsi?

1. spinous processes of TVII to LV
2.spinous processes of sacrum
3. iliac crest
4. ribs X to XII

21

What is the insertion of latissimus dorsi?

floor of inter tubercular sulcus of humerus

22

What is the innervation to latissimus dorsi?

thoracodorsal nerve (C6 to C8)

23

What is the function of latissimus dorsi?

1. extends the humerus
2. adducts the humerus
3. medially rotates the humerus

24

What muscles are in the intermediate group of the extrinsic back muscles and what do these muscles act as?

1. serratus posterior superior
2. serratus posterior inferior

weak accessory muscles for respiration

25

What is the origin of serratus posterior superior?

1. lower portion of ligamentum nuchae

2. spinous processes of CVII to TIII

3. supraspinous ligaments

26

What is the insertion of serratus posterior superior?

1. upper border of ribs II to V

- just lateral to their angles

27

What is the innervation to serratus posterior superior?

anterior rami of upper thoracic nerves (T2 and T5)

28

What is the function of serratus posterior superior?

elevates ribs II to V

29

What is the origin of serratus posterior inferior?

1. spinous processes of TXI to LIII
2. supraspinous ligaments

30

What is the insertion of superior posterior inferior?

1. lower border of ribs IX to XII

- just lateral to their angles