Extrinsic Back Muscle POINA's

Question 1

Purposeful Activity of Latissimus Dorsi

Answer 1

-Propelling a manual wheelchair forward
-Using arms to help stand up from sitting

Question 2

Origin of Latissimus Dorsi

Answer 2

Spinal Processes T 7-12
Thoracolumbar fascia
Iliac Crest
Ribs 9-12 or 10-12
7% of people have attachment to inferior angle of scapula

Question 3

Insertion of Latissimus Dorsi

Answer 3

Floor of intertubercular sulcus of humerus

Question 4

Action of Latissimus Dorsi

Answer 4

-Shoulder extension
-Shoulder internal rotation
-Shoulder adduction

Question 4

Nerve innervation of Latissimus Dorsi

Answer 4

Thoracodorsal nerve
C6, C7, and C8

Question 5

Purposeful Activity of Upper Trapezius

Answer 5

-Reaching for something overhead

Question 6

Origin of Upper Trapezius

Answer 6

-Spinous processes of C7-T12
-External occipital protuberance
-Occiput’s Superior Nuchal Line
-Ligamentum nuchae

Question 7

Insertion of Upper Trapezius

Answer 7

-Lateral 1/3 of clavicle
-Acromion of scapula
-Distal spine of scapula

Question 8

Nerve Innervation of Upper Trapezius

Answer 8

-Spinal Accessory Nerve for motor (CN XI)
-Ventral rami for pain and proprioception (C3 and C4)

Question 9

Action of Upper Trapezius

Answer 9

Bilaterally
-Head/neck extension

Unilaterally:
-Head/neck Ipsilateral lateral flexion
-Head/neck contralateral rotation
-Scapular Elevation
-Scapular Upward Rotation

Question 10

Purposeful Activity of Middle Trapezius

Answer 10

Rowing a kayak

Question 11

Origin of Middle Trapezius

Answer 11

-Spinous processes of C7-T12
-External occipital protuberance
-Occiput’s Superior Nuchal Line
-ligamentum nuchae

Question 12

Insertion of Middle Trapezius

Answer 12

-Lateral 1/3 of clavicle
-Acromion of scapula
-Middle spine of scapula

Question 13

Nerve Innervation of Middle Trapezius

Answer 13

-Spinal Accessory Nerve for motor (CN XI)
-Ventral rami for pain and proprioception (C3 and C4)

Question 14

Action of Middle Trapezius

Answer 14

-Scapular Adduction/Retraction
-Scapular stabilization

Question 15

Purposeful Activity of Lower Trapezius

Answer 15

Reaching Overhead

Question 16

Origin of Lower Trapezius

Answer 16

-Spinous processes of C7-T12
-External occipital protuberance
-Occiput’s Superior Nuchal Line
-ligamentum nuchae

Question 17

Insertion of Lower Trapezius

Answer 17

-Lateral 1/3 of clavicle
-Acromion of scapula
-Medial spine of scapula

Question 18

Nerve Innervation of Lower Trapezius

Answer 18

-Spinal Accessory Nerve for motor (CN XI)
-Ventral rami for pain and proprioception (C3 and C4)

Question 19

Action of Lower Trapezius

Answer 19

-Scapular Depression
-Scapular Upward Rotation

Question 20

Purposeful Activity of Levator Scapulae

Answer 20

-Carrying a briefcase/Farmers Carry
-Shrugging shoulders for communication

Question 21

Origin of Levator Scapulae

Answer 21

Posterior tubercles of transverse processes of C1-C4

Question 22

Insertion of Levator Scapulae

Answer 22

-Medial border of scapula between superior angle and inferior angle (root) of scapular spine (basically top medial of scapula)

Question 23

Nerve Innervation of Levator Scapulae

Answer 23

-Cervical Nerves C3 and C4
-Dorsal Scapular Nerve C4 and C5

Question 24

Action of Levator Scapulae

Answer 24

-Scapular Elevation -Scapular Downward Rotation

Question 25

Purposeful Activity of Rhomboid Major and Minor

Answer 25

Reaching into a back pocket

Question 26

Origin of Rhomboid Major

Answer 26

Spinal Processes T2-T5

Question 27

Insertion of Rhomboid Major

Answer 27

Medial border of scapula between scapular spine and inferior angle

Question 28

Nerve Innervation of Rhomboid Major

Answer 28

Dorsal Scapular Nerve C4 and C5

Question 29

Action of Rhomboid Major

Answer 29

-Scapular Adduction/Retraction -Scapular Downward Rotation -Fixes scapula to thoracic wall

Question 30

Origin of Rhomboid Minor

Answer 30

-Ligamentum Nuchae -Spinal Processes C7-T1

Question 31

Insertion of Rhomboid Minor

Answer 31

Medial border of scapular spine

Question 32

Nerve Innervation of Rhomboid Minor

Answer 32

Dorsal Scapular Nerve C4 and C5

Question 33

Action of Rhomboid Minor

Answer 33

-Scapular adduction/retraction -Scapular downward rotation -Fixes scapula to thoracic wall

Question 34

Origin of Serratus Posterior Superior

Answer 34

SP C7-T3 Just know where it is!

Question 35

Nerve Innervation of Serratus Posterior Superior

Answer 35

Ventral rami

Question 36

Action of Serratus Posterior Superior

Answer 36

Forced breathing. Rib ELEVATION with inhalation

Question 37

Origin of Serratus Posterior Inferior

Answer 37

SP T12-L3 Just know where it is!

Question 38

Nerve Innervation of Serratus Posterior Inferior

Answer 38

Ventral Rami

Question 39

Action of Serratus Posterior Inferior

Answer 39

Forced breathing, rib DEPRESSION with exhalation