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THORAX OCU2024 > Quiz 2: Thorax > Flashcards

Quiz 2: Thorax Flashcards

1
Q

Origin of Diaphragm (Costal)

A

7th-12th ribs (inner surface, lower margin of costal arch)

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2
Q

Origin of Diaphragm (Lumbar)

A

Medial Part: L1-L3 vertebral bodies, intervertebral disks, and anterior longitudinal ligament as right and left crura.

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3
Q

Origin of Diaphragm (Sternal)

A

Xiphoid Process (posterior surface)

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4
Q

Insertion of Diaphragm

A

Central Tendon

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5
Q

Action of Diaphragm

A

Primary muscle for respiration (diaphragmatic/thoracic breathing)

Compresses Abdominal Viscera

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6
Q

Origin of Anterior Scalene

A

C3-C6 (transverse process, anterior tubercle)

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7
Q

Origin of Middle Scalene

A

C1-C2 (transverse processes)

C3-C7 (transverse processes, posterior tubercle)

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8
Q

Origin of Posterior Scalene

A

C5-C7 (transverse processes, posterior tubercles)

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9
Q

Insertion of Anterior Scalene

A

1st rib (anterior scalene tubercle)

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10
Q

Insertion of Middle Scalene

A

1st rib (posterior to groove for subclavian artery)

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11
Q

Insertion of Posterior Scalene

A

2nd rib (outer surface)

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12
Q

Action of the Scalene Muscles

A

With ribs mobile: Elevates upper ribs (inspiration)

With ribs fixed: Flexes cervical spine to same side (unilaterally)

Flexes neck (bilaterally)

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13
Q

Origin of External Intercostal

A

Lower margin of rib to upper margin of lower next rib

Courses obliquely forward and DOWNWARD from costal tubercle to condor-osseus junction

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14
Q

Insertion of External Intercostal

A

Lower margin of rib to upper margin of lower next rib

Courses obliquely forward and DOWNWARD from costal tubercle to condor-osseus junction

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15
Q

Action of External Intercostal

A

Elevate Ribs

Support Intercostal Spaces

Stabilize Chest Wall

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16
Q

Origin of Internal Intercostal

A

Lower margin of rib to upper margin of lower next rib

Courses obliquely forward and UPWARD from costal angle to sternum

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17
Q

Insertion of Internal Intercostal

A

Lower margin of rib to upper margin of lower next rib

Courses obliquely forward and UPWARD from costal angle to sternum

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18
Q

Action of Internal Intercostal

A

Depress Ribs

Support Intercostal Spaces

Stabilize Chest Wall

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19
Q

Origin of Innermost Intercostal

A

Lower margin of rib to upper margin of lower next rib

Courses obliquely forward and UPWARD from costal angle to sternum

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20
Q

Insertion of Innermost Intercostal

A

Lower margin of rib to upper margin of lower next rib

Courses obliquely forward and UPWARD from costal angle to sternum

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21
Q

Action of Intermost Intercostal

A

Depress Ribs

Support Intercostal Spaces

Stabilize Chest Wall

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22
Q

Origin of Subcostal Muscle

A

Lower margin of lower ribs to the inner surface of two to three ribs below

23
Q

Insertion of Subcostal Muscle

A

Lower margin of lower ribs to the inner surface of two to three ribs below

24
Q

Action of Subcostal Muscle

A

Depress ribs

25
Q

Origin of Transverse Thoracis

A

Sternum and Xiphoid Process (inner surface)

26
Q

Insertion of Transverse Thoracis

A

2nd-6th ribs (costal cartilage and inner surface)

27
Q

Action of Transverse Thoracis

A

Weakly depresses ribs

28
Q

Origin of Subclavius

A

1st rib

29
Q

Insertion of Subclavius

A

Clavicle (inferior surface)

30
Q

Action of Subclavius

A

Steadies the clavicle in the sternoclavicular joint

31
Q

Origin of Pectoralis Minor

A

3rd-5th ribs

32
Q

Insertion of Pectoralis Minor

A

Coracoid Process

33
Q

Action of Pectoralis Minor

A

Draws scapula downward causing inferior angle to move postero-medially (scapular adduction)

Rotate glenoid inferiorly

Assists in respiration

34
Q

Origin of Serratus Anterior (Superior)

A

1st-9th ribs

35
Q

Insertion of Serratus Anterior (Superior)

A

Scapula (costal and dorsal surfaces of superior angle)

36
Q

Action of Serratus Anterior (Superior)

A

Lower raised arm

37
Q

Origin of Serratus Anterior (Intermediate)

A

1st-9th ribs

38
Q

Insertion of Serratus Anterior (Intermediate)

A

Scapula (costal surface of medial border)

39
Q

Action of Serratus Anterior (Intermediate)

A

Entire muscle draws scapula laterally forward (protraction)

Elevate ribs when shoulder is flexed

40
Q

Origin of Serratus Anterior (Inferior)

A

1st-9ribs

41
Q

Insertion of Serratus Anterior (Inferior)

A

Scapula (costal surface of medial border and costal/dorsal surfaces of inferior angle)

42
Q

Action of Serratus Anterior (Inferior)

A

Protraction

&

(allows elevation of arm above 90 degrees)

43
Q

Origin of Pectoralis Major (Clavicular)

A

Clavicle

44
Q

Insertion of Pectoralis Major (Clavicular)

A

Humerus (Crest of Greater Tubercle)

45
Q

Action of Pectoralis Major (Clavicular)

A

Entire Muscle: Adduction, Internal rotation

Clavicular and Sternocostal Part: flexion, assists in respiration when shoulder is flexed

46
Q

Origin of Pectoralis Major (Sternocostal)

A

Sternum and Costal Cartilages 1-6

47
Q

Insertion of Pectoralis Major (Sternocostal)

A

Humerus (Crest of Greater Tubercle)

48
Q

Action of Pectoralis Major (Sternocostal)

A

Entire Muscle: Adduction, Internal rotation

Clavicular and Sternocostal Part: flexion, assists in respiration when shoulder is flexed

49
Q

Origin of Pectoralis Major (Abdominal)

A

Rectus Sheath (anterior layer)

50
Q

Insertion of Pectoralis Major (Abdominal)

A

Humerus (Crest of Greater Tubercle)

51
Q

Action of Pectoralis Major (Abdominal)

A

Adduction and Internal rotation

52
Q

Origin of Coracobrachialis

A

Scapula (coracoid process)

53
Q

Insertion of Coracobrachialis

A

Humerus (in line with crest of lesser tubercle)

54
Q

Action of Coracobrachialis

A

Flexion, abduction, internal rotation

THORAX OCU2024 (2 decks)

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