Muscles of Shoulder

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Author:
msviolet_26
ID:
91866
Filename:
Muscles of Shoulder
Updated:
2011-06-24 00:49:30
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muscles shoulders
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Description:
Origin, Insertion, Action, Nerve Supply and Synergists
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  1. Deltoid (Anterior division)
    • O: Anterosuperior border of the lateral 1/3 of clavicle
    • I: Deltoid tuberosity of the humerus on the anterolateral surface just above its midshaft.
    • A: Abduction, horizontal flexion and medial rotation of the humerus at shoulder.
    • NS. : Axillary C5,C6
    • S : Middle and posterior deltoid divisions, supraspinatus and pectoralis major(clavicular division)
  2. Deltoid (Middle division)
    • O: Superior surface of the acromion process
    • I: Deltoid tuberosity of humerus
    • A: Abduciton of the humerus at the shoulder
    • NS : Axillary, C5,C6
    • S: Anterior and posterior divisions, supraspinatus
  3. Deltoid (Posterior division)
    • O: Inferior margin of spine of scapula
    • I: Deltoid tuberosity of humerus
    • A: Abduction, horizontal extention and lateral rotation of the humerus at the shoulder.
    • NS: Axillary, C5,C6
    • S: Anterior and middle divisions of deltoid, supraspinatus.
  4. Pectoralis Major (Sternal division)
    • O : Sternum to 7th rib, cartilages of true ribs and aponeurosis of external abdominal oblique muscle
    • I : Lateral lip of the intertubercular sulcus of the humerus; crest of greater tubercle.
    • A : Flexion, adduction, medial rotation and horizontal flexion of the humerus at the shoulder. Also extends flexed humerus. Through its action on the humerus it depresses, protracts and rotates scapula downwards.
    • NS: Lateral and medial pectoral, C7,8, T1
    • S: Latissimus dorsi, subscapularis, teres major.

    • *resist horizontal flexion
    • *bring arm across trunk to opposite hip.
  5. Pectoralis major (Clavicular division)
    • O: Anterior surface of the medial 1/2 of the clavicle
    • I: Lateral lip of the intertubercular sulcus of the humerus. Crest of greater tubercle.
    • A: Flexion, adduction, horizontal flexion and medial rotation of the humerus at the shoulder
    • NS: Lateral pectoral, C5,6
    • S: Biceps brachii, pectoralis major (SD), lat. dorsi, deltoid (AD)

    • *resist horizontal flexion
    • *bring arm across face
  6. Coracobrachialis
    • O: Tip of coracoid process of scapula
    • I: Middle of medial border of humerus, opposite deltoid tuberosity
    • A: Horizontal flexion and adduction of the humerus at the shoulder
    • NS: Musculocutaneous, C5,6,7
    • S: Pectoralis major, biceps brachii and anterior deltoid
  7. Latissimus Dorsi
    • O: Broad aponeurosis that originates on the spinous process of lower 6 thoracic and all lumbar vertebrae; posterior crest of ilium; posterior surface of sacrum. lower 3 or 4 ribs, and an attachment to the inferior angle of the scapula
    • I: Flat tendon that twists upon itself to insert on the intertubercular sulcus of the humerus, just anterior to and parallel with tendon of pec. major
    • A: Extends, retracts and medially rotates the humerus at the shoulder. Through its action on the humerus it depresses, retracts and rotates the scapula downwards. Assist in forced expiration.
    • NS: Thoracodorsal from brachial plexus, C6,7,8
    • S: Rhomboids, pec. major, teres major

    • *palpitate below axilla
    • *resist extention at 90 deg. flexion
  8. Teres Major
    • O: Dorsal surface of inferior angle of the scapula on lower 1/3 of scapular axillary border
    • I: Medial lip of intertubercular sulcus of humerus. Medial to latissimus dorsi tendon
    • A: Adducts and medially rotates humerus at the shoulder. Extends the shoulder joint.
    • NS: Lower subscapular, C6,7
    • S: Lat. dorsi, subscapularis

    • * REVERSED ORIGIN-INSERTION ACTION: When arm is fixed, adducts and elevates inferior angle of scapula.
    • *resist internal rotation
  9. Supraspinatus
    • O: Medial 2/3 of supraspinous fossa
    • I: Superior surface of greater tubercle of humerus and capsule of shoulder joint.
    • A: Abduction of humerus at shoulder joint. Stabilization of glenohumeral joint.
    • NS: Suprascapular, C4,5,6
    • S: Deltoid
  10. Infraspinatus
    • O: Infraspinatus fossa of scapula
    • I: Posterior aspect of greater tubercle of humerus and capsule of shoulder joint
    • A: Lateral rotation of humerus at the shoulder. Stabilization of glenohumeral joint
    • NS: Suprascapular, C4,5,6
    • S: Teres minor, subscapularis, supraspinatus, deltoid
  11. Teres Minor
    • O: Superior 2/3 of dorsal surface of axillary border of scapula
    • I: Inferior aspect of greater tubercle of the humerus, capsule of the shoulder joint
    • A: Lateral rotation of humerus at the shoulder. Stabilization of head of humerus
    • NS: Axillary, C4,5,6
    • S: Infraspinatus, subscapularis

    *REVERSED ORIGIN-INSERTION ACTION: When the humerus is stabilized, abducts the inferior angle of the scapula
  12. Subscapularis
    • O: Entire anterior surface of the subscapular fossa
    • I : Lesser tubercle of humerus and capsule of shoulder jt.
    • A: Medial rotation of humerus at the shoulder jt. Stabilization of the glenohumeral jt.
    • NS: Upper and lower subscapular, C5,6,7
    • S: Teres major, pec. major, lat. dorsi

    *REVERSED O-I ACTION: When the humerus is stabilized, abducts the inferior border of the scapula.

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