Muscles of the Shoulder Girdle

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Author:
msviolet_26
ID:
91873
Filename:
Muscles of the Shoulder Girdle
Updated:
2011-06-24 02:00:01
Tags:
muscles shoulder girdle
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Description:
Origin, Insertion, Action, Nerve Supply and synergists
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  1. Trapezius (Upper division)
    • O: External occipital protuberance, medial 1/3 of superior nuchal line, ligamentum nuchae and spinous process of the 7th cervical vertebra
    • I: Lateral 1/3 of clavicle and acromion process
    • A: Elevates the scapula as in shrugging the shoulders. Rotates the scapula upwards so the glenoid cavity faces superiorly, when acting with the other sections of the trapezius it retracts the scapula
    • NS: Spinal accessory and ventral rami of C3,4
    • S: Levator scapulae, clavicular head of the SCM, middle and lower trapezius

    *REVERSED O-I ACTION: Laterally flexes head and neck to side of contraction. Rotates head and neck away from side of contraction. Action bilaterally, extends the head and neck.
  2. Trapezius (Middle division)
    • O: Spinous process of T1-T5 vertebrae
    • I: Superior border of spine of scapula
    • A: Retracts and aids in elevation of scapula
    • NS: Spinal accessory and ventral rami, C3,4
    • S: Rhomboids, levator scapulae, upper and lower divisions of trapezius
  3. Trapezius (Lower division)
    • O: Spinous process of T6-T12 vertebrae
    • I: Medial 1/3 of spine of scapula
    • A: Depresses and retracts scapula. Rotates scapula upwards so the glenoid cavity faces superiorly. Gives inferior stabilization of scapula. Aids to maintain spine in extention
    • NS: Spinal accessory and ventral rami C3,4
    • S: Trapezius (upper and lower divisions)
  4. Levator Scapulae
    • O: Transverse processes of first four cervical vertebrae
    • I: Vertebral border of scapula between superior angle and scapular spine
    • A: Elevates the scapula and rotates the scapula downwards so the glenoid cavity faces inferiorly. Working with the upper trapezius, elevates and retracts the scapula
    • NS: Dorsal scapular, C5 and ventral rami of C3,4
    • S: Rhomboids and trapezius

    *REVERSED O-I ACTION: When scapula is fixed, laterally flexes and slightly rotates cervical spine to the same side
  5. Rhomboid Major
    • O: Spinous processes of T2-T5 vertebrae
    • I: Medial border of scapula from spine to inferior angle
    • A: Retracts and elevates the scapula. The inferior fibers aid in rotating the glenoid cavity inferiorly
    • NS: Dorsal scapular, C4,5
    • S: Upper, middle, and lower trapz, levator scap., lat. dorsi., rhomboid minor
  6. Rhomboid Minor
    • O: Lower part of ligamentum nuchae, spinous processes of C7 and T1
    • I: Medial border of scapula at the root of the spine of the scapula
    • A: Retracts and elevates the scapula. Assists in rotating the scapula downwards
    • NS: Dorsal scapular, C4,5
    • S: Upper, middle and lower trapz., levator scapulae, lat. dorsi. and rhomboid major
  7. Serratus Anterior
    • O: Superior lateral surface of upper 8 or 9 ribs at the side of the chest
    • I: Costal surface of the vertebral border along the inferior angle of scapula
    • A: Protracts scapula and rotates it upwards to point the glenoid cavity superiorly. Stabilizes vertebral border of scapula to thoracic cage, along with rhomboids and middle trapz.
    • NS: Long thoracic, C5,6,7
    • S: Pec. minor
  8. Pectoralis Minor
    • O: Anterior surfaces of 3rd, 4th and 5th ribs near the costal cartilages
    • I: Coracoid process of scapula.
    • A: Depresses scapula and rotates scapula downward.
    • Important anterior shoulder stabilizer
    • NS: Medial pectoral nerve, C6.7.8
    • S: Pec. major, serratus anterior

    *REVERSED O-I ACTION: When the scapula is fixed, it aids in rib elevation in forced inspiration
  9. Subclavius
    • O: 1st rib at the junction of the costal cartilage
    • I: Groove on the inferior surface of the clavicle, between the costoclavicular and conoid ligaments
    • A: Depresses clavicle, pulls it inferiorly and anteriorly
    • NS: Subclavian branch of the brachial plexus, C5,6

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