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Anatomy 2 > Thorax Muscles > Flashcards

Thorax Muscles Flashcards

1
Q

Serratus Anterior Origin

A

Upper eight ribs and ant intercostal membranes from midclavicular line. Lower four interdigitating with external oblique

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2
Q

Serratus Anterior Insertion

A

Inner med border scapula. 1 and 2: upper angle; 3 and 4: length of costal surface ; 5-8: inf angle

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3
Q

Serratus Anterior Action

A

Lat rotates protracts scapula

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4
Q

Serratus Anterior Innervation

A

Long thoracic Nerve (C5, 6, 7) (from roots) slips from ribs 1 and 2: C5; 3 and 4: C6; 5-8: C7)

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5
Q

Diaphragm Origin

A

Vertebral:crura from bodies of L1, 2 (left), L1-3(right). Costal: med and lat arcuate ligs, inner aspect of lower six ribs . Sternal: two slips from post aspect of xiphoid

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6
Q

Diaphragm Insertion

A

Trefoil central tendon

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7
Q

Diaphragm Action

A

Inspiration and assists in raising intra-abdominal pressure

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8
Q

Diaphragm Innervation

A

Phrenic N (motor) (C3, 4, 5). Sensory: phrenic, intercostals(6-12) and upper two lumbar N roots

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9
Q

External Intercostals Origin

A

Inf border of ribs as far back as post angles

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10
Q

External Intercostals Insertion

A

Sup border of ribs below, passing obliquely downwards and backwards

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11
Q

External Intercostals Action

A

Fix intercostal spaces during respiration. Aids forced inspiration by elevating ribs

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12
Q

External Intercostals Innervation

A

Muscular collateral brs of intercostal Ns

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13
Q

Innermost Intercostals Origin

A

Int aspect of ribs above and below

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14
Q

Innermost Intercostals Insertion

A

Int aspect of ribs above and below

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15
Q

Innermost Intercostals Action

A

Fix intercostal spaces during respiration

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16
Q

Innermost Intercostals Innervation

A

Muscular collateral brs of intercostal Ns

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17
Q

Internal Intercostals Origin

A

Inf border of ribs as far back as post angles

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18
Q

Internal Intercostals Insertion

A

Sup border of ribs below , passing obliquely downwards and backwards

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19
Q

Internal Intercostals Action

A

Fix intercostal spaces during expiration. Aids forced inspiration by elevating ribs

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20
Q

Internal Intercostals Innervation

A

Muscular collateral brs of intercostal Ns

21
Q

Levatores Costarum Origin

A

Transverse processes C7 to T11

22
Q

Levatores Costarum Insertion

A

Post surface and angle of rib below

23
Q

Levatores Costarum Action

A

Elevates ribs

24
Q

Levatores Costarum Innervation

A

Muscular collateral brs of intercostal Ns

25
Q

Pectoralis Major Origin

A

Clavicular head-med half clavicle. Sternocostal head -lat manubrium and sternum, six upper costal cartilages and ext oblique aponeurosis

26
Q

Pectoralis Major Insertion

A

Lat lip of bicipital groove of humerus and ant lip of deltoid tuberosity

27
Q

Pectoralis Major Action

A

Clavicular head:flexes and adducts arm. Sternal head: adducts and med rotates arm . Accessory for inspiration

28
Q

Pectoralis Major Innervation

A

Med pectoral nn(from med cord) and lat pectoral nn (from lat cord) (C6, 7, 8)

29
Q

Pectoralis Minor Origin

A

3, 4,5 ribs

30
Q

Pectoralis Minor Insertion

A

Med and upper surface of coracoid process of scapula

31
Q

Pectoralis Minor Action

A

Elevates ribs if scapula fixed, protracts scapula (assists serratus ant )

32
Q

Pectoralis Minor Innervation

A

Med pectoral N (C8, T1) (from med cord)

33
Q

Serratus Posterior Inferior Origin

A

Spinous processes and supraspinous ligs of T11-L2

34
Q

Serratus Posterior Inferior Insertion

A

Post aspect of ribs 9-12

35
Q

Serratus Posterior Inferior Action

A

Assists forced expiration

36
Q

Serratus Posterior Inferior Innervation

A

Ant primary rami (T9-12)

37
Q

Serratus Posterior Superior Origin

A

Spinous processes and supraspinous ligs of C7-T2

38
Q

Serratus Posterior Superior Insertion

A

Post aspect of ribs 2-5

39
Q

Serratus Posterior Superior Action

A

Assists forced inspiration

40
Q

Serratus Posterior Superior Innervation

A

Ant primary rami (T2-5)

41
Q

Subcostals Origin

A

Int post aspects of lower six ribs

42
Q

Subcostals Insertion

A

Int aspects of ribs two to three levels below

43
Q

Subcostals Action

A

Depresses lower ribs

44
Q

Subcostals Innervation

A

Muscular collateral brs of intercostal Ns

45
Q

Transversus Thoracis Origin

A

Lower third of inner aspect of sternum and lower three costosternal junctions

46
Q

Transversus Thoracis Insertion

A

Second to sixth costal cartilages

47
Q

Transversus Thoracis Action

A

Depresses upper ribs

48
Q

Transversus Thoracis Innervation

A

Muscular collateral brs of intercostal Ns

Anatomy 2 (23 decks)

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