Extrinsic Back Muscles

Question 0

Trapezius

Insertion

Answer 0

Lateral third of clavicle
acromion
spine of scapula

Question 1

Trapezius

Origin

Answer 1

EOP
Nuchal ligament
Medial third of nuchal line
Spinous processes of C7-C12

Question 2

Trapezius

Innervation

Answer 2

Cranial Motor Nerve XI-Accessory Nerve

Sensory Nerves C3,C4

Question 3

Trapezius

Actions

Answer 3

Descending-elevates
Ascending-depresses
Middle-retracts scapula
descending and ascending act to rotate glenoid cavity

Question 4

Latissimus Dorsi

Origin

Answer 4

Thoracolumbar fascia
Spinous processes of inferior six thoracic vertebra
inferior three or four ribs
iliac crest

Question 5

Latissimus Dorsi

Insertion

Answer 5

Floor of Intertubercular sulcus of the humerus

Question 6

Latissimus Dorsi

Innervation

Answer 6

Thoracodorsal

Spinal: C6, C7, C8

Question 7

Latissimus Dorsi

Actions

Answer 7

Extends
Adducts
Medially rotates shoulder

Question 8

Levator Scapulae

Origin

Answer 8

Posterior tubercles of transverse processes of C1-C4 vertebrae

Question 9

Levator Scapulae

Insertion

Answer 9

Medial border of scapula superior to root of spine

Question 10

Levator Scapulae

Innervation

Answer 10

Dorsalscapular: C5

Cervical spinal nerves : C3, C4 spinal nerves

Question 11

Levator Scapulae

Actions

Answer 11

Elevates scapula

Tilts its glenoid cavity inferiorly by rotating scapula

Question 12

Rhomboids

Origins

Answer 12

Minor: Nuchal ligament, spinous processes of C7 and T1
Major: Spinous processes of T2-T5

Question 13

Rhomboids

Insertion

Answer 13

Maj: Medial border of scapula superior to root of spine
Min: Medial border of scapula from level of spine to inferior angle

Question 14

Rhomboids

Innervation

Answer 14

Dorsoscapular Nerve

C4, C5

Question 15

Rhomboids

Actions

Answer 15

Retracts scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall