Superficial Back

Question 1

What are the attachments of latissimus dorsi

Answer 1

from lower thoracic spinous processes, thoracolumbar fascia, illiac crest to the floor of the intertubercular sulcus of the humerus

Question 2

Latissimus dorsi actions

Answer 2

adduction, extension, and internally rotate humerus

Question 3

Latissimus dorsi innervation

Answer 3

thoracodorsal nerve (C6-C8)

Question 4

Levator scapulae attachments

Answer 4

from transverse processes of C1-C4 to the superior angle and superomedial border of scapula

Question 5

Levator scapulae actions

Answer 5

elevate and downwardly rotate scapula

Question 6

Levator scapulae innervation

Answer 6

motor: dorsal scapular nerve (C4-C5)
sensory: C3-C4

Question 7

Pectoralis Major attachments

Answer 7

from clavicle, costal cartilages, sternum to lateral lip of the intertubercular sulcus of humerus

Clavicular head and sternocostal head

Question 8

Pectoralis Major actions

Answer 8

humeral adduction, flexion, and internal rotation
sternocostal head= flexed arm extension

Question 9

Pectoralis Major innervation

Answer 9

medial and lateral pectoral nerve

medial= sternocostal head (C8-T1)
lateral= clavicular head (C5-C7)

Question 10

Pectoralis Minor attachments

Answer 10

from outer surfaces of ribs 3-5 to coracoid process

Question 11

Pectoralis Minor actions

Answer 11

anterior tilt of scapula, assists with depression of the shoulder, forced inhalation

Question 12

Pectoralis Minor innervation

Answer 12

medial and lateral pectoral nerves (C5-T1)

Question 13

Rhomboids attachments

Answer 13

from ligamentun nuchae and spinous process of C7-T5 to medial border of scapula

Question 14

Rhomboids actions

Answer 14

elevate and retract scapula, downward rotation of scapula

Question 15

Rhomboids innervation

Answer 15

motor: dorsal scapular nerve (C4-C4) sensory: anterior rami of C3-C4

Question 16

Serratus anterior attachment

Answer 16

from outer surfaces and upper borders of the first 8-10 ribs to the costal surface of the medial border of the scapula

Question 17

Serratus anterior actions

Answer 17

scap protraction and upward rotation of scapula

Question 18

Serratus anterior innervation

Answer 18

long thoracic nerve (C5-C7)

Question 19

Subclavius attachments

Answer 19

from first rib cartilage to undersurface of the clavicle

Question 20

Subclavius actions

Answer 20

depresses and stabilizes the clavicle

Question 21

Subclavius innervation

Answer 21

Subclavian nerve (C5-C6)

Question 22

Trapezius attachments

Answer 22

from nuchal line, external occipital protuberance, and ligamentum nuchae to cervical and thoracic spinous processes to the spine of scapula, acromion, and clavicle

Question 23

Trapezius actions

Answer 23

scapular elevation (upper), retraction (middle), depression (lower), upward rotation (upper and lower)

Question 24

Trapezius innervation

Answer 24

motor: cranial nerve XI aka accessory nerve
sensory: C3-C4

Question 24

What is the difference between extrinsic back muscles and intrinsic

Answer 24

extrinsic are axioappendicular and aid in limb movement, respiration, and proprioception while the intrinsic muscles aid in vertebral column movement and stabilization

Question 25

What are the extrinsic superficial back muscles

Answer 25

Trapezius, levator scapulae, rhomboids, latissimus dorsi

Question 26

What are the extrinsic intermediate back muscles

Answer 26

serratus posterior superior and inferior

Question 27

What are the intrinsic superficial muscles

Answer 27

splenius muscles: capitis and cervicus

Question 28

What are the intrinsic intermediate muscles

Answer 28

erector spinae: spinalis, longissimus, and illiocostalis

Question 29

What are the intrinsic deep muscles

Answer 29

transversospinales: semispinalis, multifidus, and rotatores