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Anatomy (Upper Extremity) > Extrinsic Muscles of the Back > Flashcards

Extrinsic Muscles of the Back Flashcards

1
Q

What is the origin of Trapezius?

A
  • occipital bone
  • nuchal ligament
  • thoracic spinous processes
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2
Q

What is the insertion of Trapezius?

A
  • Clavicle
  • acromion
  • spine of scapula
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3
Q

What is the innervation of Trapezius?

A

CN XI - Accessory

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4
Q

What are the actions of Trapezius?

A

Superior: elevation and upward rotation of scapula

Middle: retraction of scapula (adduction)

Inferior: depression and upward rotation of the scapula

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5
Q

What is the origin of Latissimus Dorsi?

A
  • Thoracocolumbar fascia
  • Iliac crests
  • Ribs
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6
Q

Latissimus Dorsi insertion

A

Anteromedial aspect of proximal humerus

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7
Q

What innervates Latissimus Dorsi?

A

Thoracodorsal (long scapular nerve) (C6, C7, C8)

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8
Q

Latissimus Dorsi Actions?

A

Glenohumeral joint: Extension, adduction, medial rotation

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9
Q

Levator Scapulae: origin

A

cervical transverse processes (C1-C4)

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10
Q

Levator Scapulae: insertion

A

superior angle of scapula

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11
Q

Levator Scapulae: innervation

A

Dorsal scapular nerve (C5)

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12
Q

Levator Scapulae: actions

A
  • Elevation of scapula
  • Downward rotation of scapula
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13
Q

Rhomboid major: origin

A
  • Nuchal ligament
  • thoracic spinous processes
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14
Q

Rhomboid major: insertion

A

medial border of scapula

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15
Q

Rhomboid major: innervation

A

dorsal scapular (C5)

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16
Q

Rhomboid major: action

A
  • retraction of scapula
  • downward rotation of scapula
  • fixes scapula to body wall
17
Q

Rhomboid minor: origin

A
  • nuchal ligament
  • thoracic spinous processes
18
Q

Rhomboid minor: insertion

A

Medial border of scapula (superior to Rhomboid major)

19
Q

Rhomboid minor: innervation

A

Dorsal scapular nerve (C5)

20
Q

Rhomboid minor: action

A
  • Retraction of scapula
  • Downward rotation of scapula
  • Fixes scapula to the body wall

Anatomy (Upper Extremity) (12 decks)

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