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Anatomy > Superficial Back Muscles > Flashcards

Superficial Back Muscles Flashcards

1
Q

Origin of Trapezius

A

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

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2
Q

Insertion of Trapezius

A

Lateral one-third of clavicle, acromion, spine of scapula

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3
Q

Innervation of Trapezius

A

Motor-accessory nerve [XI]; proprioception-C3 and C4

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4
Q

Function of Trapezius

A

Assists in rotating the scapula during abduction of humerus above horizontal; upper fibers elevate, middle fibers adduct, and lower fibers depress scapula

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5
Q

Origin of Rhomboid major

A

Spinous processes of TII to TV

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6
Q

Insertion of Rhomboid major

A

Medial border of scapula between spine and inferior angle

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7
Q

Innervation of Rhomboid major

A

Dorsal scapular nerve (C4, C5)

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8
Q

Function of Rhomboid major

A

Retracts (adducts) and elevates scapula

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9
Q

Origin of Rhomboid minor

A

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

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10
Q

Insertion of Rhomboid minor

A

Medial border of scapula at the spine of scapula

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11
Q

Innervation of Rhomboid minor

A

Dorsal scapular nerve (C4, C5)

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12
Q

Function of Rhomboid minor

A

Retracts (adducts) and elevates scapula

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13
Q

Origin of Levator scapulae

A

Transverse processes of CI to CIV

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14
Q

Insertion of Levator scapulae

A

Upper portion medial border of scapula

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15
Q

Innervation of Levator scapulae

A

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

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16
Q

Function of Levator scapulae

A

Elevates scapula

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17
Q

Origin of Serratus anterior

A

Lateral surfaces of upper 8-9 ribs and deep fascia overlying the related intercostal spaces

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18
Q

Insertion of Serratus anterior

A

Costal surface of medial border of scapula

19
Q

Innervation of Serratus anterior

A

Long thoracic nerve [C5, C6, C7]

20
Q

Function of Serratus anterior

A

Protraction and rotation of the scapula; keeps medial border and inferior angle of scapula opposed to thoracic wall

21
Q

Origin of Teres major

A

Elongate oval area on the posterior surface of the inferior angle of the scapula

22
Q

Insertion of Teres major

A

Medial lip of the intertubercular sulcus on the anterior surface of the humerus

23
Q

Innervation of Teres major

A

Lower subscapular nerve [C5, C6, C7]

24
Q

Function of Teres major

A

Medial rotation and extension of the arm at the glenohumeral joint

25
Q

Origin of Teres minor

A

Upper two-thirds of a flattened strip of bone on the posterior surface of the scapula immediately adjacent to the lateral border of the scapula

26
Q

Insertion of Teres minor

A

Inferior facet on the posterior surface of the greater tubercle of the humerus

27
Q

Innervation of Teres minor

A

Axillary nerve [C5, C6]

28
Q

Function of Teres minor

A

Rotator cuff muscle; lateral rotation of arm at the glenohumeral joint

29
Q

Origin of Supraspinatus

A

Medial two-thirds of the supraspinous fossa of the scapula and the deep fascia that covers the muscle

30
Q

Insertion of Supraspinatus

A

Most superior facet on the greater tubercle of the humerus

31
Q

Innervation of Supraspinatus

A

Suprascapular nerve [C5, C6]

32
Q

Function of Supraspinatus

A

Rotator cuff muscle; initiation of abduction of arm to 15° at glenohumeral joint

33
Q

Origin of Infraspinatus

A

Medial two-thirds of the infraspinous fossa of the scapula and the deep fascia that covers the muscle

34
Q

Insertion of Infraspinatus

A

Middle facet on posterior surface of the greater tubercle of the humerus

35
Q

Innervation of Infraspinatus

A

Suprascapular nerve [C5, C6]

36
Q

Function of Infraspinatus

A

Rotator cuff muscle; lateral rotation of arm at the glenohumeral joint

37
Q

Origin of Subscapularis

A

Medial two-thirds of subscapular fossa

38
Q

Insertion of Subscapularis

A

Lesser tubercle of humerus

39
Q

Innervation of Subscapularis

A

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

40
Q

Function of Subscapularis

A

Rotator cuff muscle; medial rotation of the arm at the glenohumeral joint

41
Q

Origin of Latissimus dorsi

A

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

42
Q

Insertion of Latissimus dorsi

A

Floor of intertubercular sulcus of humerus

43
Q

Innervation of Latissimus dorsi

A

Thoracodorsal nerve (C6 to C8)

44
Q

Function of Latissimus dorsi

A

Extends, adducts, and medially rotates humerus

Anatomy (10 decks)

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