Back Muscles

Question 0

Main action of trapezius?

Answer 0

Elevation, retraction and rotation of scapula

Question 1

What are the extrinsic muscles of the back?

Answer 1

• Trapezius
• Latissimus dorsi
• Levator scapulae
• Rhomboid minor
• Rhomboid major

Question 2

Main action of latissimus dorsi?

Answer 2

Extends, abducts and medially rotates humerus

Question 3

Main action of levator scapulae?

Answer 3

• Elevates scapula

- Tilts glenoid cavity by rotating scapula

Question 4

Main action of the rhomboid minor?

Answer 4

• Retracts scapula
• Rotates scapula to depress glenoid cavity
• Fix scapula to thoracic wall

Question 5

Main action of rhomboid major?

Answer 5

• Retracts scapula
• Rotates scapula to depress glenoid cavity
• Fix scapula to thoracic wall

Question 6

Innervation of trapezius?

Answer 6

• Spinal root of accessory nerve (CN XI)

- C3 & C4 cervical nerves

Question 7

Innervation of latissimus dorsi?

Answer 7

Thoracodorsal nerves (C6, C7, C8)

Question 8

Innervation of levator scapulae?

Answer 8

• Dorsal scapular (C5)

- Cervical nerves (C3 & C4)

Question 9

Innervation of rhomboid minor?

Answer 9

Dorsal scapular nerve (C4 & C5)

Question 10

Innervation of rhomboid major?

Answer 10

Dorsal scapular nerve (C4 & C5)

Question 11

Proximal attachment of trapezius?

Answer 11

“MENS”

• Medial 1/3 of sup. nuchal line
• Ext. occipital protuberance
• Nuchal ligament
• Spinous processes of C7-T12

Question 12

Distal attachments of trapezius?

Answer 12

“LAS”

• Lateral 1/3 of clavicle
• Acromion
• Spine of scapula

Question 13

Proximal attachment of latissimus dorsi?

Answer 13

“I SIT”

• Inf. 3/4 ribs
• Spinous processes of T6-T12
• Iliac crest
• Thoracolumbar fascia

Question 14

Distal attachments of latissimus dorsi?

Answer 14

Floor of intertubercular groove of humerus

Question 15

Proximal attachment of levator scapulae?

Answer 15

Post. tubercles of transverse processes of C1-C4

Question 16

Distal attachments of levator scapula?

Answer 16

Sup. part of medial border of scapula

Question 17

Proximal attachment of rhomboid minor?

Answer 17

• Nuchal ligament

- Spinous processes of C7 & T1

Question 18

Distal attachments of rhomboid minor?

Answer 18

Medial border of scapula from level of spine to inf. angle

Question 19

Proximal attachment of rhomboid major?

Answer 19

Spinous processes of T2-T5

Question 20

Distal attachment of rhomboid major?

Answer 20

Medial border of scapula from level of spine to inf. angle

Question 21

What are the intermediate muscles of the back?

Answer 21

• Serratus posterior sup.

- Serratus posterior inf.

Question 22

What are the superficial intrinsic muscles of the back?

Answer 22

Splenius muscles:

• Splenius capitus
• Splenius cervicis

Question 23

What are the intermediate intrinsic muscles of the back?

Answer 23

Erector spinae muscles (I Love Sex):

• Iliocostalis
• Longissimus
• Spinalis

Question 24

What are the transversospinalis intrinsic muscles of the back?

Answer 24

- Semispinalis muscles: capitus, cervicis and thoracis - Multifidus (deep to semispinalis) - Rotatores (deep to multifidus)

Question 25

What are the minor deep intrinsic muscles of the back?

Answer 25

- Interspinales - Intertranversarii - Levator costarum

Question 26

Main action of the splenius muscles?

Answer 26

- Extension of head and neck | - Lateral rotation of head

Question 27

Main action of erector spinae muscles?

Answer 27

- Extension of vertebral column & head | - Lateral bending of vertebral column

Question 28

Main action of transversospinalis muscles?

Answer 28

- Extension of head - Extension of thoracic and cervical vertebrae - Contralateral rotation of vertebral column - Stabilization of vertebral column during movement

Question 29

Main action of minor deep muscle layer?

Answer 29

Aids in: - extension, rotation and lateral bending of vertebral column - elevates ribs for inspiration (levator costarum only)

Question 30

Innervation of splenius muscles?

Answer 30

Dorsal rami of spinal nerves

Question 31

Innervation of erector spinae muscles?

Answer 31

Dorsal rami of spinal nerves

Question 32

Innervation of transversospinalis muscles?

Answer 32

Dorsal rami of spinal nerves

Question 33

Innervation of minor deep muscles layers?

Answer 33

Dorsal and ventral rami of spinal nerves

Question 34

Proximal attachment of splenius muscles?

Answer 34

- Nuchal ligament | - Spinous processes (C7-T3)

Question 35

Distal attachment of splenius muscles?

Answer 35

1. S. Capitus: - mastoid process - sup. nuchal line 2. S. Cervicis: - post. tubercle of transverse processes of C1-C3

Question 36

Proximal attachment of erector spinae muscles?

Answer 36

- Post. part of iliac crest - Post. surface of sacrum - Sacral & inf. lumbar spinous process - Supraspinous ligament

Question 37

Distal attachment of erector spinae muscles?

Answer 37

1. Iliocostalis: - angle of lower ribs - cervical transverse processes 2. Longissimus - ribs between tubercle and angles - transverse processes of thoracic and cervical regions - mastoid process of temporal bone 3. Spinalis - Spinous processes in upper thoracic region - skull

Question 38

Proximal attachment of transversospinalis muscles?

Answer 38

- Transverse processes | - Sacrum and ilium (multifidus only)

Question 39

Distal attachment of transversospinalis muscles?

Answer 39

1. Semispinalis: - occipital bone - spinous processes in cervical and thoracic regions 2. Multifidus - spinous processes of vertebrae above it 3. Rotatores: - spinous processes of vertebrae above it - skull

Question 40

Proximal attachment of minor deep muscle layer?

Answer 40

1. Interspinales: spinous processes 2. Intertransversarii: transverse processes 3. Levator costarum: tips of transverse processes

Question 41

Distal attachment of minor deep muscle layers?

Answer 41

1. Interspinales: sup. spinous processes 2. Intertranversarii: adjacent transverse processes 3. Levator costarum: rib (between tubercle and angle)