Ant. Axio-Appendicular and Scapulohumeral muscles

Question 0

Insertion of pectoralis major

Answer 0

Lateral lip of intertubercular sulcus (groove) of humerus

Question 1

Origin of pectoralis major

Answer 1

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 2

Innervation of pectoralis major

Answer 2

Lateral and medial pectoral nerves
Clavicular head (C5 and C6)
Sternocostal head (C7, C8, T1)

Question 3

Main actions of pectoralis major

Answer 3

Adducts and medially rotates shoulder joint
Draws scapula anteriorly and inferiorly
Alone : clavicular head flexes shoulder joint and sternocostal head extends it from the flexed position

Question 4

Origin of pectoralis minor

Answer 4

3rd-5th ribs near their costal cartilages

Question 5

Insertion of pectoralis minor

Answer 5

Medial border and superior surface of coracoid process of scapula

Question 6

Innervation of pectoralis minor

Answer 6

Medial pectoral nerve (C8, T1)

Question 7

Action of pectoralis minor

Answer 7

Stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall

Question 8

Origin of subclavius

Answer 8

Junction of 1st rib and its costal cartilage

Question 9

Insertion of subclavius

Answer 9

Inferior surface of middle third of clavicle

Question 10

Innervation of subclavius

Answer 10

Subclavian nerve (C5, C6)

Question 11

Action of subclavius

Answer 11

Anchors and depresses clavicle

Question 12

Origin of serratus anterior

Answer 12

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

Question 13

Insertion of serratus anterior

Answer 13

Anterior surface of medial border of scapula

Question 14

Innervation of serratus anterior

Answer 14

Long thoracic nerve (C5, C6, C7)

Question 15

Action of serratus anterior

Answer 15

Protracts scapula and holds against thoracic wall; rotates scapula

Question 16

Origin of deltoids

Answer 16

Lateral third of clavicle

Acromion and spine of scapula

Question 17

Insertion of deltoids

Answer 17

Deltoid tuberosity of humerus

Question 18

Innervation of deltoid

Answer 18

Axillary nerve (C5, C6)

Question 19

Action of deltoid

Answer 19

Clavicular part flexes and medially rotates shoulder joint
Acromial part abducts shoulder joint
Spinal part extends and laterally rotates shoulder joint

Question 20

Origin of supraspinatus

Answer 20

Supraspinous fossa of scapula

Question 21

Insertion of supraspinous

Answer 21

Superior facet of greater tubercle of humerus

Question 22

Innervation of supraspinatus

Answer 22

Suprascapular nerve (C4, C5, C6)

Question 23

Action of supraspinatus

Answer 23

Initiates and assists deltoid in abduction of shoulder joint and acts with other rotator cuff muscles

Question 24

Origin of infraspinatus

Answer 24

Infraspinous fossa of scapula

Question 25

Insertion of infraspinatus

Answer 25

Middle facet of greater tubercle of humerus

Question 26

Innervation of infraspinatus

Answer 26

Suprascapular nerve (C5, C6)

Question 27

Action of infraspinatus

Answer 27

Laterally rotate shoulder joint | Help hold humeral head in glenoid cavity of scapula

Question 28

Origin of teres minor

Answer 28

Middle part of lateral border of scapula

Question 29

Insertion of teres minor

Answer 29

Inferior facet of greater tubercle of humerus

Question 30

Innervation of teres minor

Answer 30

Axillary nerve (C5, C6)

Question 31

Action of teres minor

Answer 31

Laterally rotate shoulder joint | Help hold humeral head in glenoid cavity of scapula

Question 32

Origin of teres major

Answer 32

Inferior part of lateral border of scapula and posterior surface of inferior angle of scapula

Question 33

Insertion of teres major

Answer 33

Medial lip of intertubercular sulcus of humerus

Question 34

Innervation of teres major

Answer 34

Lower subscapular nerve (C5, C6)

Question 35

Action of teres major

Answer 35

Adducts and medially rotates shoulder joint

Question 36

Origin of subscapularis

Answer 36

Subscapular fossa (most of anterior surface of scapula)

Question 37

Insertion of subscapularis

Answer 37

Lesser tubercle of humerus

Question 38

Innervation of subscapularis

Answer 38

Upper and lower subscapular nerves (C5, C6, C7)

Question 39

Action of subscapularis

Answer 39

Medially rotates and adducts shoulder joint | Helps hold humeral head in glenoid cavity