Muscles of Shoulder Girdle

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Muscles of Shoulder Girdle
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Muscles of Shoulder Girdle

• Classified according to location on trunk
• ANTERIOR muscles
• POSTERIOR muscles

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Shoulder GirdleMuscle Locations

• Anterior
• Pectoralis Minor
• Serratus Anterior
• Subclavius

• Posterior
• Levator Scapulae
• Rhomboids
• Trapezius (4 sides)

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Pectoralis Minor

• Origin Insertion
• Anterior surfaces of Coracoid process of
  scapula
• the 3rd-5th ribs

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Pectoralis Minor

• Action Innervation
• Abduction Medial Pectorial Nerve (C8-T1)
• Downward Rotation
• Depression

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Serratus Anterior

• Origin
• Surface of the upper 9 ribs at side of chest
• Insertion
• Anterior aspect of the whole length of the medial
  border of scapula

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Serratus Anterior

• Action
• Abduction
• Upward Rotation
• Innervation
• Long Thoratic Nerve (C5,6,7)

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Subclavius

• Origin
• Superior aspect of 1st rib
• _at_junction with its costal
• cartilage
• Insertion
• Inferior groove in the
• mid-portion of clavicle

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Subclavius

• Action
• Stabilization protection of
• Sternoclavicular Joint (SC)
• Depression
• Innervation
• Nerve fibers from C5 C6

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Levator Scapulae

• Origin
• Transverse processes of the upper 4 cervical
  vertebrae
• Insertion
• Medial border of scapula above the base of the
  scapular spine

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Levator Scapulae

• Action
• Elevates scapula
• Innervation
• Dorsal scapula nerve C5 branches of C3 C4

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Rhomboid Major Minor

• Origin
• Spinous process of the last cervical first 5
  thoracic vertebrae
• Insertion
• Medial border of scapula, below the spine

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Rhomboid Major Minor

• Action
• Adduction
• Downward Rotation
• Elevation
• Innervation
• Dorsal scapula nerve (C5)

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Trapezius

• Origin
• Upper base of skull
• Middle spinous process
• of 7th CV upper 3 TV
• Lower spinous process
• of 4th-12th TV

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Trapezius

• Insertion
• Upper posterior aspect of the lateral 1/3
  clavicle
• Middle medial border acromion process upper
  border of scapular spine
• Lower Triangular space at base of scapular spine

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Trapezius

• Action
• Upper Scapula Head
• elevation of scapula
• extension of head
• Middle Scapula
• elevation
• upward rotation
• adduction
• Lower Scapula
• depression
• adduction
• upward rotation

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Trapezius

• Innervation
• Accessory Nerve (Cranial nerve XI Branches of
  C3-4)