Muscles of the Shoulder Flashcards Preview

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Flashcards in Muscles of the Shoulder Deck (14)
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1
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Latissimus Dorsi

  • O: SP’s T7 L5; thoracolumbar fascia, illiac crest, posterior sacrum; ribs 9-12; inferior angle of scapula
  • I: Medial lip of bicipital groove of humerous
  • A: adduction, medial rotation & extension of shoulder; anertior pelvic tilt; downward rotation of scapula
  • N: thoracodorsal nerve (C6,C7,C8)
2
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Rhomboid Major

  • SP’s T2-T5, supraspinous ligament
  • I: medial border of scapula ( scapular spine to inferior angle)
  • A: retraction of scapula; elevation & downward rotation of scap
  • N: dorsal scapular nerve (C4, C5)
3
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Rhomboid minor

  • O: SP’s C7/T1, supraspinatus ligament
  • I: medial border at root of spine of the scapula
  • A: retraction of scapula, elevation& downward rotation of scap
  • N: dorsal scapular nerve (C4, C5)
4
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Serratus Anterior

  • O:lateral surfaces & superior borders of ribs 1-8/9
  • I: costal surface of medial border of scap
  • A: protraction and upward rotation of scap; stabilizes scap for upper extremity movements
  • N: long thoracic nerve (C5 - C7)
5
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Serratus Posterior

  • O: SP’s C7-T2/3
  • I: ribs 2-5 (superior external border)
  • A: elevation of ribs
  • N: intercostal & subcostal nerves
6
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Deltoid

  • O: Lateral 1/3 of clav, acromion process & spine of scap
  • I: deltoid tuberocity of humerus
  • A: Abduction of shoulder( middle fibers)
    • flexion, horizontal adduction & medial rotation of shoulder (anterior fibers)
    • extension, horizontal abduction & lateral rotation of shoulder (posterior fibers)
  • N: axillary nerve (C5, C6)
7
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Supraspinatus

  • O: medial 2/3 of the supraspinatus fossa of scap
  • I: superior faccet of the greater tubricle of humerous
  • A: abduction of shoulder, stabilizes GH joint
  • N: suprascapular nerve (C5, C6)
8
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Infraspinatus

  • O: medial 2/3 of the infraspinatus fossa & inferior portion of spine of scap
  • I: middle facet of the greater tubercle of the humerus & shoulder joint capsule
  • A: lateral rotation of shoulder, stabilizes GH joint
  • N: suprascapular nerve C5, C6
9
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Teres Minor

  • O: superior lateral border of scap
  • I: inferior facet of greater tubercle of humerus & shoulder joint capsule
  • A: lateral rotaion of shoulder, stabilizes GH joint, adduction of shoulder (weak action)
  • N: axillary nerve C5, C6
10
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subscapularis

  • O: subscapular fossa of scap
  • I: lesser tubercle of humerus & shoulder joint capsule
  • A: medial rotation of joint & stabilizes GH joint
  • N: upper and lower subscapular nerves C5, C6
11
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Teres Major

  • O: dorsal surfaces of the inferior angle and lower 1/3 of the lateral border of the scapula
  • I: medial lip of bicipital groove of humerus (just medial to insertion of latissimus dorsi)
  • A: medial rotation, adduction, extension of the shoulder from a flexed position, upward scapular rotaion (closed chain action)
  • N: lower subscapular nerve C5, C6, C7
12
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Pectoralis Major

  • O: Clavicular fibers - medial 1/2 of the clavicle
    • sternal fibers - anterior surface of sternum
    • costal fibers - costal cartilage of ribs 1-6
  • I: crest of the greater tubercle of humerus (lateral lip of bicipital groove)
  • A: adduction and medial rotation of shoulder; horizantal adduction of shoulder, flexion of shoulder (clavicular portion)
  • N: medial and lateral pectoral nerve C8, T1
13
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Pectoralis Minor

  • O: superior margins of ribs 3-5 (anterior lateral portion), facia over corresponding intercostal muscles
  • I: coracoid process of scapula (medial aspect)
  • A: stabilizes scapula for arm movements; depresses and downwardly rotates scapula; assits in scapular protraction from retracted position; elevates ribs 3-5 (forced expiration)
  • N: medial pectoral nerve C8, T1
14
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Trapezius Middle anr Lower

  • O: Middle: SP’s C7-T5 & nuchal ligament
    • Lower: SP’s T5-T12
  • I: lateral 1/3 of clavicle, acromion process, spine of scapula
  • A: elevation & retraction of scapula, upward rotation of scapula, stabilization of scapula for upper arm movements
    • extension of head
    • lateral flexion of head
  • N: Spinal accessory nerve CN XI vetral rami C2-C4