Back Muscles

Question 1

Extrinsic Muscles of the Back
1. Superficial Group -move the upper limbs
-innervated by various superficial nerves
2. Intermediate Group -move the ribs.
-Innervated by the anterior rami of the spinal nerves

Answer 1

Epaxial Muscles of the Back

Question 2

Psoas Major and Quadratus Lumborum)
-are innervated by the anterior rami

Answer 2

Hypaxial Muscles

Question 3

Superficial Group

Answer 3

Trapezius
Latissimus Dorsi
Levator Scapuli
Rhomboid major
Rhomboid minor

Question 4

Trapezius Origin

Answer 4

Superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of CVII to TXII

Question 5

Trapezius Insertion

Answer 5

Lateral one-third of clavicle, acromion, spine of scapula

Question 6

Trapezius Innervation

Answer 6

Motor—accessory nerve [XI]; proprioception—C3 and C4

Question 7

Trapezius Function

Answer 7

Assists in rotating the scapula during abduction of humerus above horizontal; upper fibers elevate, middle fibers adduct, and lower fibers depress scapula

Question 8

Latissimus dorsi
Origin

Answer 8

Spinous processes of TVII to LV and sacrum, iliac crest, ribs X to XII

Question 9

Latissimus dorsi Insertion

Answer 9

Floor of intertubercular sulcus of humerus

Question 10

Latissimus dorsi Innervation

Answer 10

Thoracodorsal nerve (C6 to C8)

Question 11

Latissimus dorsi Function

Answer 11

Extends, adducts, and medially rotates humerus

Question 12

Levator scapulae Origin

Answer 12

Transverse processes of CI to CIV

Question 13

Levator scapulae Insertion

Answer 13

Upper portion medial border of scapula

Question 14

Levator scapulae Innervation

Answer 14

C3 to C4 and dorsal scapular nerve (C4, C5)

Question 15

Levator scapulae Function

Answer 15

Elevates scapula

Question 16

Rhomboid major Origin

Answer 16

Spinous processes of TII to TV

Question 17

Rhomboid major Insertion

Answer 17

Medial border of scapula between spine and inferior angle

Question 18

Rhomboid major Innervation

Answer 18

Dorsal scapular nerve (C4, C5)

Question 19

Rhomboid major Function

Answer 19

Retracts (adducts) and elevates scapula

Question 20

Rhomboid minor Origin

Answer 20

Lower portion of ligamentum nuchae, spinous processes of CVII and TI

Question 21

Rhomboid minor Insertion

Answer 21

Medial border of scapula at the spine of scapula

Question 22

Rhomboid minor Innervation

Answer 22

Dorsal scapular nerve (C4, C5)

Question 23

Rhomboid minor Function

Answer 23

Retracts (adducts) and elevates scapula

Question 24

Serratus posterior superior Origin

Answer 24

Lower portion of ligamentum nuchae, spinous processes of CVII to TIII and supraspinous ligaments

Question 25

Serratus posterior superior Insertion

Answer 25

Upper border of ribs II to V just lateral to their angles

Question 26

Serratus posterior superior Innervation

Answer 26

Anterior rami of upper thoracic nerves (T2 to T5)

Question 27

Serratus posterior superior Function

Answer 27

Elevates ribs II to V

Question 28

Serratus posterior inferior Origin

Answer 28

Spinous processes of TXI to LIII and supraspinous ligaments

Question 29

Serratus posterior inferior Insertion

Answer 29

Lower border of ribs IX to XII just lateral to their angles

Question 30

Serratus posterior inferior Innervation

Answer 30

Anterior rami of lower thoracic nerves (T9 to T12)

Question 31

Serratus posterior inferior Function

Answer 31

Depresses ribs IX to XII and may prevent lower ribs from being elevated when the diaphragm contracts

Question 32

Intermediate Group

Answer 32

Serratus posterior superior Serratus posterior inferior

Question 33

1. Splenius capitis 2. Splenius cervicis

Answer 33

Spinotransversesalis Muscle Group

Question 34

1. Iliocostalis lumborum 2. Iliocostalis thoracis 3. Ilicostalis cervicis 4. Longissimus thoracis 5. Longissimus cervicis 6. Longissimus capitis 7. Spinalis thoracis 8. Spinalis cervicis 9. Spinalis capitis

Answer 34

Errector spinae Muscle Group

Question 35

1. Semispinalis thoracis 2. Semispinalis cervicis 3. Semispinalis capitis 4. Multifidus 5. Rotatores lumborum 6. Rotatores thoracis 7. Rotatores cervicis

Answer 35

Transversopinales Muscle Group

Question 36

1. Levatores costarum (Elevates Ribs) 2. Interspinales 3. Intertransversari

Answer 36

Segemental Muscle Group

Question 37

1. Rectus capitis posterior major 2. Rectus capitis posterior minor 3. Obliqus capitis inferior 4. Obliqus capitis superior

Answer 37

Suboccipital Muscle Group