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Gross Anatomy > Superficial Muscles of the Back > Flashcards

Superficial Muscles of the Back Flashcards

1
Q

trapezius origin

A

external occipital protuberance, medial 1/3 of super nuchal line, ligamentum nuchae, and SPs of C7-T12

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2
Q

trapezius insertion superior fibers

A

lateral 1/3 of clavicle

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3
Q

trapezius insertion middle fibers

A

acromion and spine of scapula

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4
Q

trapezius insertion inferior fibers

A

base of spine of scapula

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5
Q

innervation of trapezius

A

accessory cranial nerve and 3rd and 4th ventral rami combine to form subtrapezial plexus

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6
Q

blood supply of trapezius

A

superficial branch of transverse cervical artery

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7
Q

action of trapezius?

A

raise, retract, and rotate scapula

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8
Q

lat dorsi origin

A

SPs of T7-T12, all lumbar vertebrae and sacral vertebrae SPs, and posterior part of iliac crest, and lower 3-4 ribs

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9
Q

lat dorsi insertion

A

crest of lesser tubercle, floor of bicipital groove of humerus

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10
Q

innervation of lat dorsi

A

thoracodorsal nerve

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11
Q

blood supply of lat dorsi

A

thoracodorsal artery

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12
Q

action of lat dorsi

A

extend, medial rotation, adduction of arm

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13
Q

what fibers of the trapezius retract the scapula?

A

middle fibers

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14
Q

what fibers of the trapezius depress scapula?

A

inferior fibers

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15
Q

what fibers of the trapezius elevate the scapula and rotate the scapula upwards?

A

superior

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16
Q

which muscle is the large, fan shaped muscle that covers the inferior 1/2 of the back and acts directly on shoulder joint and indirectly on pectoral girdle?

A

lat dorsi

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17
Q

in what muscle does the superior 1/3 lie deep the the SCM and the inferior 2/3 lie deep to the trap?

A

lev scap

18
Q

origin of lev scap?

A

post tubercles of TPs of C1/3/4

19
Q

insertion of lev scap?

A

medial border of scap from superior angle to ROSOS

20
Q

innervation of lev scap?

A

ventral rami C3/4 from deep branches of cervical plexus and twig from dorsal scapular nerve C5

21
Q

blood supply of levator scapulae?

A

deep branch of transverse cervical artery

22
Q

action of levator scapulae?

A

elevate and retract scapula with trapezius, laterally flex cervical vertebral column when scapula is fixed

23
Q

what two muscles lie deep to trapezius?

A

r minor and major

24
Q

r minor and r major act together to perform what action?

A

retract scapula and rotate it to depress glenoid fossa

25
Q

r minor origin?

A

lower part of lig nuchae and SPs of C7 and T1

26
Q

insertion of r minor?

A

medial border of scapula at ROSOS

27
Q

innervation of r minor?

A

dorsal scapular nerve C4/5

28
Q

r minor blood supply?

A

deep branch of transverse cervical artery

29
Q

action of r minor?

A

elevate medial border of scapula, retract scapula, and downwards rotation of scapula

30
Q

r major origin?

A

SPs of T2-5

31
Q

insertion of r major?

A

medial border of scapula between ROSOS and inferior angle

32
Q

innervation of r major?

A

dorsal scapular nerve C4/5

33
Q

dorsal scapular nerve?

A

C4/5

34
Q

r major blood supply?

A

deep branch of transverse cervical artery

35
Q

action of r major?

A

elevate medial border of scapula, retract scapula, and downward rotation of scapula

36
Q

what is the triangle of auscultation?

A

formed by intersection of lat dorsi, trap, and vertebral border of scapula where r major forms the floor and only a thin tissue covers ribs, making sounds of thorax audible

37
Q

aponeurosis

A

flat sheet or ribbon of tendon like tissue that anchors a muscle, takes place of tendon or bone in sheet like muscles having wide area of attachment

38
Q

thoracolumbar aponeurosis

A

thin, transparent fascia in thoracic region. thick, strong fibrous CT that contains fibroblasts in lumbar. blends laterally with aponeurosis of TVA in lumbar region

39
Q

anterior layer of thoracolumbar aponeurosis?

A

anterior to QL. ends medially in TP of LV. combines laterally with aponeurosis of TVA.

40
Q

middle layer of TCA?

A

posterior to QL and attaches to TP. anterior to intrinsic muscles of back.

41
Q

posterior layer of TCA?

A

covers erector spinae group. ends laterally in lumbar by blending with aponeurosis of TVA.

42
Q

principal actions of superficial muscles of the back?

A

motions of the upper limb

Gross Anatomy (9 decks)

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