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Anatomy > Muscles Of Thorax And Back > Flashcards

Muscles Of Thorax And Back Flashcards

1
Q

List 4 superficial muscles

A

Pectoralis Major, Subclavius, Pectoralis minor, Serratus anterior

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2
Q

Which superficial muscle originates at the medial half of clavicle and anterior surface of sternum

A

Pectoralis Major

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3
Q

Where does the Pectoralis major muscle originate?

A

Medial half of clavicle, anterior surface of sternum, first seven costal cartilages, aponeurosis of external oblique

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4
Q

Where does the Pectoralis major insert?

A

Lateral lip of Inter tubercular sulcus of humerus

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5
Q

Action of Pectoralis major muscle

A

Adduction, Medial rotation, flexión of the humerus at the shoulder joint

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6
Q

Innervation of the Pectoralis major muscle

A

Medial and lateral pectoral nerve

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7
Q

Origin of subclavius

A

Rib I junction between rib and costal cartilage

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8
Q

Insertion of subclavius muscle

A

Groove on inferior surface of middle third of clavicle

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9
Q

Action of subclavius muscle

A

Pulls clavicle medially to stabilise sternoclavicular joint, depresses tip of shoulder joint

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10
Q

Innervation of subclavius muscle

A

Nerve to subclavius

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11
Q

Origin of Pectoralis minor muscle

A

Anterior surface of third, fourth and fifth ribs, and deep fascia overlying the related intercostal spaces

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12
Q

Insertion of Pectoralis minor muscle

A

Coracoid process of scapula

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13
Q

Action of Pectoralis minor

A

Depresses tip of shoulder , protracts scapula

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14
Q

Innervation of Pectoralis minor muscle

A

Medial pectoral nerves

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15
Q

Origin of serratus anterior

A

Anterior portions of first 8 ribs

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16
Q

Insertion of serratus anterior

A

Internal surface of medial border of scapula

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17
Q

Action of serratus anterior muscle

A

Holds scapula against rib cage to prevent winging of inferior angle of scapula

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18
Q

Innervation of serratus anterior

A

Long thoracic nerve

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19
Q

List the superficial back muscles

A

Trapezius, Latissimus Dorsi, Levator scapulae, Rhomboid major, Rhomboid mimor

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20
Q

Origin of Trapezius muscle

A

Superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of CVII to TXII

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21
Q

Insertion of trapezius muscle

A

Lateral one third of clavicle , acromion, spine of scapula

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22
Q

Innervation of trapezius muscle

A

Motor accessory nerve (XI) proprioception C3 and C4

23
Q

Function of trapezius muscle

A

Assists in rotating the scapula during abduction of humerus above horizontal , upper fibres elevates, middle fibres adduction, lower fibres depress scapula

24
Q

Origin of Latissimus dorsi

A

Spinous process of TVII to LV and sacrum, iliac crest, ribs X to XII

25
Q

Insertion of Latissimus dorsi

A

Floor of Inter tubercular sulcus of humerus

26
Q

Innervation of Latissimus dorsi

A

Thoracodorsal nerve (C6- C8)

27
Q

Action of Latissimus Dorsi

A

Extends, Adducts, Medially rotates humerus

28
Q

Origin of Levator scapulae

A

Transverse process of CI to CIV

29
Q

Insertion of Levator scapulae

A

Upper portion medial border of scapula

30
Q

Innervation of Levator scapulae

A

C3 to C4 and dorsal scapular nerve (C4 & C5)

31
Q

Function of Levator scapulae

A

Elevates scapula

32
Q

Origin of rhomboid major

A

Spinous process of TII to TV

33
Q

Insertion of rhomboid major

A

Medial border of scapula between spine and inferior angle

34
Q

Innervation of rhomboid major

A

Dorsal scapular nerve (C4& C5)

35
Q

Function of rhomboid major

A

Retracts ( adducts) and elevates scapula

36
Q

Origin of rhomboid minor

A

Lower portion of ligamentum nuchae, spinous processes of CVII and TI

37
Q

Insertion of rhomboid minor

A

Medial border of scapula between spine and inferior angle

38
Q

Innervation of rhomboid minor

A

Dorsal scapular nerve (C4 &C5)

39
Q

Function of rhomboid minor

A

Retracts (adducts) and elevates scapula

40
Q

Name the two intermediate group of back muscles

A

Serratus posterior superior, serratus posterior inferior,

41
Q

Origin of Serratus posterior superior

A

Lower portion of ligamentum nuchae, spinous process of C7 to T3 and supraspinous ligaments

42
Q

Insertion of Serratus posterior superior

A

Upper border of ribs 2 to 5 just lateral to their angles

43
Q

Innervation of serratus posterior superior

A

Intercostal nerves / Anterior rami of upper thoracic nerve (T2 to T5)

44
Q

Function of serratus posterior superior

A

Elevates ribs 2 to 5

45
Q

Origin of Serratus posterior inferior

A

Spinous processes of T11 to L3 and supraspinous ligaments

46
Q

Insertion of serratus posterior inferior

A

Lower border of ribs 9 to 12 just lateral to their angles

47
Q

Innervation of serratus posterior inferior

A

Intercostal Nevres / Anterior rami of lower thoracic nerves (T9 to T12)

48
Q

Function of serratus posterior inferior

A

Depresses ribs 9 to 12 and may prevent ribs from being elevated when the diaphragm contracts

49
Q

List two groups of deep back muscles

A

Spinotransversales
Erector spinae

50
Q

Name the two spinotransversales muscles

A

Splenius capitis, Splenius cervicis

51
Q

Origin of Splenius capitis

A

Lower aspect of ligamentum nuchae, and spinous processes of C7 to T3/4 vertebrae

52
Q

Insertion of splenius capitis

A

Mastoid process and the occipital bone

53
Q

Action of splenius capitis

A

Rotate head the same side

54
Q

Innervation of splenius capitis

A

Posterior rami of spinal nerves C3 and C4

Anatomy (6 decks)

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