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HK3401 > Muscle Actions > Flashcards

Muscle Actions Flashcards

1
Q

Trapezius

A
  • descending fibers: elevation of scapula
  • medial fibers: retraction of scapula
  • ascending fibers: depression of scapula
  • rotation of glenoid cavity superiorly
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2
Q

Brachialis

A
  • Elbow flexion
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3
Q

Biceps Brachii

A
  • Forearm supination
  • Elbow flexion
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4
Q

Coracobrachialis

A
  • Shoulder flexion
  • Shoulder adduction
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5
Q

Segmentals

(Interspinales, Intertransversarii, Levator Costarum)

A
  • Extension of vertebral column
  • Lateral flexion of vertebral column
  • Stabilize vertebral column
  • Levator Costarum: elevate ribs, assist in respiration, assist in lateral flexion of vertebral column
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6
Q

Latissimus Dorsi

A
  • medial rotation of humerus
  • adduction of humerus
  • extends humerus
  • raises body toward upper limbs when climbing
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7
Q

Transversospinales

(Semispinalis, Multifidus, Rotatores)

A
  • Extends vertebral column
  • Laterally flexes / rotates vertebral column
  • Stabilizes vertebral column
  • Rotatores: proprioceptive function?
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8
Q

Levator Scapulae

A
  • retracts scapula
  • rotates glenoid cavity inferiorly
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9
Q

Rhomboids (major & minor)

A
  • retracts scapula
  • rotates glenoid cavity inferiorly
  • fixes scapula against thoracic wall
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10
Q

Erector Spinae

(Iliocostalis, Longissimus, Spinalis)

A
  • Extends vertebral column
  • Laterally flexes vertebral column
  • Stabilizes vertebral column
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11
Q

Deltoid

A
  • anterior fibers: medial rotation and flexion of humerus
  • middle fibers: abduction of humerus
  • posterior fibers: laterally rotates and extends humerus
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12
Q

Splenius (capitis & cervicis)

A
  • Flexes neck laterally
  • Rotates head
  • Extends head and neck
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13
Q

Serratus Posterior (superior & inferior)

A
  • Active during respiration?
  • Proprioceptive function?
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14
Q

Serratus Anterior

A
  • Protracts scapula
  • Rotates scapula
  • Holds scapula against thorax
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15
Q

Teres Major

A
  • medial rotation of humerus
  • adduction of humerus
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16
Q

Subscapularis

A
  • medial rotation of humerus
  • stabilizes shoulder joint
17
Q

Subclavius

A
  • Stabilizes /anchors clavicle,
  • Depresses clavicle
18
Q

Pectoralis Minor

A
  • Stabilizes scapula (draws scapula
    anteriorly and inferiorly against
    thorax)
19
Q

Supraspinatus

A
  • abduction of humerus
  • stabilizes shoulder joint
20
Q

Pectoralis Major

A
  • Adducts humerus
  • Medially rotates humerus
  • Clavicular head: flexes humerus
  • Sternocostal head: extends humerus from flexed position
21
Q

Infraspinatus

A
  • lateral rotation of humerus
  • stabilizes shoulder joint
22
Q

Teres Minor

A
  • laterally rotates humerus
  • stabilizes shoulder joint

HK3401 (3 decks)

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