shoulder

Question 1

What is the origin of the Serratus Anterior?

Answer 1

External surfaces of lateral parts of 1st-8th ribs

The Serratus Anterior plays a crucial role in protracting the scapula.

Question 2

What is the action of the Serratus Anterior?

Answer 2

Protracts scapula and holds it against thoracic wall; rotates scapula

This muscle is essential for movements like pushing and lifting.

Question 3

Which nerve supplies the Serratus Anterior?

Answer 3

Long thoracic nerve

Question 4

What is the insertion point of the Subclavius muscle?

Answer 4

Inferior surface of middle third of clavicle

Question 5

What is the action of the Subclavius muscle?

Answer 5

Anchors and depresses clavicle

Question 6

Which nerve supplies the Subclavius muscle?

Answer 6

Nerve to subclavius

Question 7

What is the origin of the Pectoralis Minor?

Answer 7

3rd, 4th, and 5th ribs

Question 8

What is the action of the Pectoralis Minor?

Answer 8

Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall

Question 9

Which nerve supplies the Pectoralis Minor?

Answer 9

Medial pectoral nerve

Question 10

What are the origins of the Pectoralis Major?

Answer 10

Clavicular head: anterior surface of medial half of clavicle; Sternocostal head: anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle

Question 11

What is the action of the Pectoralis Major?

Answer 11

Adducts arm and rotates it medially; clavicular fibers also flex arm

Question 12

Which nerves supply the Pectoralis Major?

Answer 12

Medial and lateral pectoral nerves

Question 13

What is the origin of the Levator Scapulae?

Answer 13

Transverse processes of 1st four cervical vertebrae

Question 14

What is the action of the Levator Scapulae?

Answer 14

Elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula

Question 15

Which nerve supplies the Levator Scapulae?

Answer 15

Dorsal scapular nerve

Question 16

What is the action of the Rhomboid Major?

Answer 16

Retract scapula and rotate it to depress glenoid cavity

Question 17

What is the origin of the Latissimus Dorsi?

Answer 17

Iliac crest, lumbar fascia, spines of lower six thoracic vertebrae, lower three or four ribs, and inferior angle of scapula

Question 18

What is the action of the Latissimus Dorsi?

Answer 18

Extends, adducts, and medially rotates the arm

Question 19

Which nerve supplies the Latissimus Dorsi?

Answer 19

Thoracodorsal nerve

Question 20

What is the origin of the Trapezius?

Answer 20

Occipital bone, ligamentum nuchae, spine of 7th cervical vertebra, spines of all thoracic vertebrae

Question 21

What is the action of the Trapezius?

Answer 21

Descending part elevates; Ascending part depresses; middle part retracts scapula

Question 22

Which nerve supplies the Trapezius?

Answer 22

Spinal part of accessory nerve

Question 23

What are the boundaries of the Quadrangular space?

Answer 23

The medial margin of the long head of triceps brachii, superior margin of teres major, inferior margin of teres minor

Question 24

What structures pass through the Quadrangular space?

Answer 24

The axillary nerve, the posterior circumflex humeral artery and vein

Question 25

What is the insertion of the Teres Major?

Answer 25

Medial lip of intertubercular groove of humerus

Question 26

What is the action of the Teres Major?

Answer 26

Adducts and medially rotates arm

Question 27

Which nerve supplies the Teres Major?

Answer 27

Lower subscapular nerve

Question 28

What is the origin of the Supraspinatus?

Answer 28

Supraspinous fossa of scapula

Question 29

What is the action of the Supraspinatus?

Answer 29

Initiates and assists deltoid in abduction of arm

Question 30

Which nerve supplies the Supraspinatus?

Answer 30

Suprascapular nerve

Question 31

What is the origin of the Infraspinatus?

Answer 31

Infraspinous fossa of scapula

Question 32

What is the action of the Infraspinatus?

Answer 32

Laterally rotates arm

Question 33

What is the origin of the Teres Minor?

Answer 33

Middle part of lateral border of scapula

Question 34

Which nerve supplies the Teres Minor?

Answer 34

Axillary nerve

Question 35

What is the origin of the Subscapularis?

Answer 35

Subscapular fossa

Question 36

What is the action of the Subscapularis?

Answer 36

Medially rotates and adducts arm

Question 37

Which nerves supply the Subscapularis?

Answer 37

Upper and lower subscapular nerves

Question 38

What is the function of the rotator cuff muscles?

Answer 38

Hold the humeral head in the glenoid cavity of the scapula during all movement of the shoulder joint

Question 39

What is the significance of injury to the axillary nerve?

Answer 39

The shoulder has a flattened appearance and loss of sensation may occur over the lateral side of the proximal part of the arm