Anterior Axioappendicular Muscles

Question 0

Pectoralis Major Insertion

Answer 0

1) Lateral lip of intertubercular sulcus of humerus

Question 1

Pectoralis Major Origin

Answer 1

Clavicular head:
1) anterior surface of medial half of clavicle

Sternocostal head:

1) anterior surface of sternum
2) superior six costal cartilages
3) aponeurosis of external oblique muscle

Question 2

Pectoralis Major Innervation

Answer 2

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

Question 3

Pectoralis Major Action

Answer 3

Adducts and medially rotates humerus
Draw scapula anteriorly and inferiorly

Acting alone: clavicular head flexes humerus and sternocostal head extends it from the flexed position

Question 4

Pectoralis Minor Origin

Answer 4

1) 3rd-5th ribs near their costal cartilages

Question 5

Pectoralis Minor Insertion

Answer 5

1) Medial border and superior surface of coracoid process of scapula

Question 6

Pectoralis Minor Innervation

Answer 6

Medial pectoral nerve (C8, T1)

Question 7

Pectoralis Minor Action

Answer 7

Stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall

Question 8

Subclavius Origin

Answer 8

1) Junction of 1st rib and its costal cartilage

Question 9

Subclavius Insertion

Answer 9

1) Inferior surface of middle third of clavicle

Question 10

Subclavius Innervation

Answer 10

Subclavian nerve (C5, C6)

Question 11

Subclavian Action

Answer 11

Anchors and depresses clavicle

Question 12

Serratus Anterior Origin

Answer 12

1) External surface of lateral parts of 1st-8th ribs

Question 13

Serratus Anterior Insertion

Answer 13

1) Anterior surface of medial border of scapula

Question 14

Serrats Anterior Innervation

Answer 14

Long thoracic nerve (C5, C6, C7)

Question 15

Serratus Anterior Action

Answer 15

Protracts scapula and holds against thoracic wall

Rotates scapula

Question 16

Deltoid Origin

Answer 16

1) Lateral third of clavicle

2) Acromion and spine of scapula

Question 17

Deltoid Insertion

Answer 17

1) Deltoid tuberosity of humerus

Question 18

Deltoid Innervation

Answer 18

Axillary nerve (C5, C6)

Question 19

Deltoid Action

Answer 19

Clavicular (anterior) part flexes and medially rotates arm
Acromial (middle) part abducts arm
Spinal (posterior) part extends and laterally rotates arm

Question 20

Supraspinatus Origin

Answer 20

1) Supraspinous fossa of scapula

Question 21

Supraspinatus Insertion

Answer 21

Superior facet of greater tubercle of humerus

Question 22

Supraspinatus Innervation

Answer 22

Suprascapular nerve (C4, C5, C6)

Question 23

Supraspinatus Action

Answer 23

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

Question 24

Infraspinatus Origin

Answer 24

Infraspinous fossa of scapula

Question 25

Infraspinous Insertion

Answer 25

Middle facet of greater tubercle of humerus

Question 26

Infraspinatus Innervation

Answer 26

Suprascapular Nerve (C5, C6)

Question 27

Infraspinatus Action

Answer 27

Laterally rotate arm

Help hold humeral head in glenoid cavity of scapula

Question 28

Teres Minor Origin

Answer 28

Middle part of lateral boarder of scapula

Question 29

Teres Minor Insertion

Answer 29

Inferior facet of greater tubercle of humerus

Question 30

Teres minor Innervation

Answer 30

Axillary Nerve (C5, C6)

Question 31

Teres Minor Action

Answer 31

Laterally rotate arm

Help hold humeral head in glenoid cavity of scapula

Question 32

Teres Major Origin

Answer 32

Posterior surface of inferior angle of scapula

Question 33

Teres Major Insertion

Answer 33

Medial lip of intertubercular groove of humerus

Question 34

Teres Major Innervation

Answer 34

Lower subscapular nerve (C5, C6)

Question 35

Teres Major Action

Answer 35

Adducts and medially rotates arm

Question 36

Subscapularis Origin

Answer 36

Subscapular fossa (most of anterior surface of scapula)

Question 37

Subscapularis Insertion

Answer 37

Lesser tubercle of humerus

Question 38

Subscapularis Innercation

Answer 38

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

Question 39

Subscapularis Action

Answer 39

Medially rotates and adducts arm

Helps hold humeral head in glenoid cavity of scapula