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Flashcards in Thorax Muscles Deck (30)
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1

Pectoralis Major- Clavicular Head Origin

Anterior surface of medial half of clavicle

2

Pectoralis Major- Clavicular Head Insertion

Lateral lip intertubercular sulcus of humerus

3

Pectoralis Major- Clavicular Head Innervation

Lateral and medial pectoral nerves; clavicular head (C5,C6), sternocostal head (C7,C8,T1)

4

Pectoralis Major- Clavicular Head Action

Both heads adducts and medially rotates humerus; draws scapula anteriorly and inferiorly. Clavicular head flexes humerus

5

Pectoralis Major- Sternocostal Head Origin

Anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle

6

Pectoralis Major- Sternocostal Head Insertion

Lateral lip intertubercular sulcus of humerus

7

Pectoralis Major- Sternocostal Head Innervation

Lateral and medial pectoral nerves; clavicular head (C5,C6), sternocostal head (C7,C8,T1)

8

Pectoralis Major- Sternocostal Head Action

Both heads adducts and medially rotates humerus; draws scapula anteriorly and inferiorly. Sternocostal head extends it from the flexed position

9

External Intercostal Origin

Inferior border of ribs

10

External Intercostal Insertion

Superior border of ribs below

11

External Intercostal Innervation

Intercostal nerve

12

External Intercostal Action

Elevate ribs during forced inspiration

13

Internal Intercostal & Innermost Intercostal Origin

Inferior border of ribs

14

Internal Intercostal & Innermost Intercostal Insertion

Superior border of ribs below

15

Internal Intercostal & Innermost Intercostal Innervation

Intercostal nerve

16

Internal Intercostal & Innermost Intercostal Action

Interosseous part: depresses ribs

17

Transversus Thoracis Origin

Posterior surface of lower sternum

18

Transversus Thoracis Insertion

Internal surface of costal cartilages 2-6

19

Transversus Thoracis Innervation

Intercostal nerve

20

Transversus Thoracis Action

Weakly depress ribs and proprioception

21

Subcostal Origin

Internal surface of lower ribs near their angles

22

Subcostal Insertion

Superior borders of 2nd or 3rd ribs below

23

Subcostal Innervation

Intercostal nerve

24

Subcostal Action

Probably act in same manner as internal intercostal muscles

25

Inferior Oblique (IO) Innervation

Oculomotor nerve (CN III)

26

Inferior Oblique (IO) Action

Abducts, elevates, and laterally rotates eyeball

27

Diaphragm origin

Xiphoid process, inner surface of ribs 7-12

28

Diaphragm insertion

Central tendon of the diaphragm

29

Diaphragm innervation

Phrenic nerve (C3-C5)

30

Diaphragm action

Increases intrathoracic volume during inhalation