Lecture 6: Muscles Of The Shoulder Girlde And Arm

Question 1

Innervation of the Trapezius Muscle

Answer 1

Accessory Nerve (CN XI) and Cervical Nerves C3 and C4

Question 2

Actions of Superior Fibers of the Trapezius

Answer 2

Elevates, rotates scapula superiorly
Extends head and neck
Contra lateral rotation of head and neck
IpsiLateral flexion of head and neck

Question 3

Action of middle fibers of trapezius

Answer 3

Retracts scapula

Question 4

Action of inferior fibers of trapezius

Answer 4

Depresses scapula
Superior rotation of scapula

Question 5

Origin of Trapezius

Answer 5

Medial 1/3 of superior nuchal line
EOP (inion)
Ligamentum nuchae
Spinous Processes C7-T12

Question 6

Insertion of Trapezius

Answer 6

Lateral 1/3 of clavicle
Acromion process
Spine of scapula

Question 7

Origin of Superior Fibers of Trapezius

Answer 7

External Occipital Protruberance
Superior Nuchal Line
Nuchal ligament

Question 8

Insertion of Superior Fibers of Trapezius

Answer 8

Post aspect of lateral 1/3 of clavicle
Acromion

Question 9

Other name for superior fibers of Trapezius Muscle

Answer 9

Descending part of Trapezius

Question 10

Origin of Middle Fibers of Trapezius

Answer 10

SP C7-T5

Question 11

Insertion of Middle Fibers of Trapezius

Answer 11

Acromion
Lateral end of spine of scapula

Question 12

Other name for Middle Fibers of trapezius

Answer 12

Transverse Part of Trapezius Muscle

Question 13

Other name for Inferior Fibers of Trapezius

Answer 13

Ascending part of Trapezius

Question 14

Origin for Inferior Part of Trapezius

Answer 14

SP T6–T12

Question 15

Insertion for Inferior Fibers of Trapezius

Answer 15

Medial End of Spine of Scapula

Question 16

Origin of Latissimus Dorsi

Answer 16

1. SP T7-S5 via thoracolumbar fascia
2. Post Iliac Crest
3. Ribs 10-12
4. Inferior angle of the scapula

Question 17

Insertion of Latissimus Dorsi

Answer 17

1. Medial lip of intertubecular groove
2. Floor of bicipital groove of the humerus

Question 18

Innervation of Latissimus Dorsi

Answer 18

Thoracodorsal nerve
(C6, 7, 8)

Question 19

Action of Latissimus Dorsi

Answer 19

Extends, adducts and internally rotates humerus
Assists with forced inspiration

Question 20

Origin of Levator Scapulae

Answer 20

Post tubercles of TVP’s C1-C4

Question 21

Insertion of Levator Scapulae

Answer 21

Medial border of scapula superior to spine - including superior angle

Question 22

Innervation of Levator Scapulae

Answer 22

Dorsal Scapular Nerve C5
Cervical Nerve C3-C4

Question 23

Action of Levator Scapulae

Answer 23

Elevates and inferiorly rotates scapula
Extension and lateral flexion of C spine (if scapula is fixed)

Question 24

Origin of Rhomboideus Minor

Answer 24

Medial border of scapula including root and above

Question 25

Origin of Rhomboideus Major

Answer 25

SP T2-T5

Question 26

Insertion of Rhomboideus Major

Answer 26

Medial border of scapula below spine

Question 27

Origin of Rhonboideus Minor

Answer 27

SP of C7-T1

Question 28

Innervation of Rhomboid Major and Minor

Answer 28

Dorsal Scapular nerve C5

Question 29

Actions of Rhomboids Major and Minor

Answer 29

1. Retraction,
2. elevation and
3. inferior rotation of scapulae

Question 30

Deltoid origin

Answer 30

Lateral 1/3 of clavicle
Acromion process
Inferior border of spine of scapula

Question 31

Insertion of Deltoid

Answer 31

Deltoid tuberosity of humerus

Question 32

Innervation of Deltoid

Answer 32

Axillary Nerve (C5,6)

Question 33

Common movement of Deltoid Fibres

Answer 33

Abduction of GH joint

Question 34

Action of anterior fibres of Deltoid muscle

Answer 34

Flexion and medial rotation of humerus

Question 35

Action of posterior fibres of Deltoid muscle

Answer 35

Extends and laterally rotates humerus

Question 36

Origin of Teres Major

Answer 36

Lower 1/3 of lateral border of scapula going across inferior angle to medial border (tip not included).

Question 37

Insertion of Teres Major

Answer 37

Medial lip of intertubercular sulcus of humerus
(Crest of lesser tubercle)

Question 38

Innervation of Teres Major

Answer 38

Lower subscapular nerve (C5,6)

Question 39

Action of Teres Major

Answer 39

Adducts and medically rotates humerus