Extrinsic Back Muscles

Question 1

Origin of Vertebral part of Latissimus Dorsi?

Answer 1

Spinous process of T7-T12 vertebrae, thoracolumbar fascia

Question 2

Origin of Scapular part of Latissimus Dorsi?

Answer 2

Scapula (inferior angle)

Question 3

Origin of Costal part of Latissimus Dorsi?

Answer 3

9th to 12th ribs

Question 4

Origin of Iliac part of Latissimus Dorsi?

Answer 4

Iliac crest (posterior one-third)

Question 5

Insertion of Latissimus Dorsi?

Answer 5

Floor of the intertubucular groove of the humerus

Question 6

Innervation of the Latissimus Dorsi?

Answer 6

Thoracodorsal n. (C6-C8)

Question 7

Action of the Latissimus Dorsi? (4 things)

Answer 7

Internal rotation, adduction, extension, respiration

cough muscle

Question 8

Origin of the Descending part of the Trapezius?

Answer 8

Occipital bone; spinous process of C1-C7

Question 9

Origin of the transverse part of the Trapezius muscle?

Answer 9

Aponeurosis at T1-T4 spinous processes

Question 10

Origin of the ascending part of the trapezius?

Answer 10

Spinous process of T5-T12

Question 11

Insertion of the Descending part of Trapezius?

Answer 11

Clavicle (lateral one third)

Question 12

Insertion of the Transverse part of the Trapezius?

Answer 12

Acromion

Question 13

Insertion of Ascending part of Trapezius?

Answer 13

Scapular spine

Question 14

Innervation of the Trapezius?

Answer 14

Accessory n. (CN XI)

C3-C4 of cervical plexus

Question 15

Action of the descending Trapezius muscle?

Answer 15

Draws scapula obliquely upward (elevates scapula)
Rotates glenoid cavity superiorly
Tilts head to same side and rotates it to opposite (ipsilateral lateral flexion, contralateral rotation)

Question 16

Action for transverse trapezius?

Answer 16

Draws scapula medially

Question 17

Action for ascending part of trapezius?

Answer 17

Draws scapula medially downward

Question 18

Action for the ENTIRE trapezius muscle? (stabilization)

Answer 18

Steadies the scapula on the thorax

Question 19

Origin of Levatator scapulae?

Answer 19

Transverse process of C1-C4

Question 20

Insertion of Levator Scapulae?

Answer 20

Scapula (superior angle)

Question 21

Innervation of levator scapulae?

Answer 21

Dorsal Scapular n. (C4-C5)

Question 22

Action of the Levator Scapulae?

Answer 22

Draws scapula medially upward (retracts scapula) while moving inferior angle medially; inclines neck to same side (ipsilateral lateral flexion)

Question 23

Origin of Rhomboid Minor?

Answer 23

Spinous process of C7-T1

Question 24

Insertion of Rhomboid Minor?

Answer 24

Medial border of scapula above (minor) and below (major) scapular spine (medial border of scapula at root of spine)

Question 25

Innervation of Rhomboid Minor?

Answer 25

Dorsal scapular n. (C4-C5)

Question 26

Action of Rhomboid Minor?

Answer 26

Steadies scapula; draws scapula medially upward (elevates scapula)

Question 27

Origin of Rhomboid Major?

Answer 27

Spinous process of T2-T5 vertebrae

Question 28

Insertion of Rhomboid major?

Answer 28

Medial border of scapula above (minor) and below (major) scapular spine

Question 29

Innervation of Rhomboid Major?

Answer 29

Dorsal scapular n. (C4-C5)

Question 30

Action of Rhomboid Major?

Answer 30

Steadies scapula, draws scapula medially upward (elevates scapula)

Question 31

Origin of Vertebral part of Latissimus Dorsi?

Answer 31

Spinous Process of T7-T12 vertebrae;

Thoracolumbar fascia