Download Muscles of the Spine - Liberty Union High School District

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Transcript 
Muscles of the Spine
Latissimus Dorsi
• Origin:
• Spinous process of T6 through T12 and Lumbar vertebrae
• Insertion:
• Intertubercular groove of the Humerus
• Inferior portion of scapula
• Action:
• Lateral trunk flexion
• Anterior rotation of the pelvis
Trapezius
Trapezius
• Upper 1/3:
• Origin:
• Occipital protuberance
• Spinous process of C7
• Insertion:
• Distal/lateral 1/3 of Clavicle
• Acromion Process
• Action
• Elevation of Scapula
• Upward rotation of Scapula
• Rotation of Scapula to the opposite side
Trapezius
• Middle 1/3:
• Origin:
• Spinous processes of the 7th cervical vertebrae, & T1-T5
• Insertion:
• Acromion Process
• Spine of the scapula (superior-lateral border)
• Action:
• Retraction of scapula
• Fixation of thoracic spine
Trapezius
• Lower 1/3:
• Origin:
• Spinous processes & Supraspinal ligaments of T8-T12
• Insertion:
• Spine of Scapula (medial portion)
• Action:
• Depression of Scapula
• Retraction of Scapula
• Fixation of thoracic spine
Serratus Anterior
Serratus Anterior
• Origin:
• Anterior surface of the first 8-9 ribs
• Insertion:
• Anterior surface of medial border of scapula
• Action:
• Abducts (protracts) and upwardly rotates scapula; stabilizes scapula
Iliocostalis
• Origin:
• Iliac Crest, Ribs 3-12
• Insertion:
• Ribs 1-12, Transvers processes of C4-C7
• Actions:
• Laterally Flexes, extends the spine
Longissimus
• Origin:
• Common erector spinae tendon, Transverse processes of T1-T5, Articular
processes of C5-C6
• Insertion:
• Transverse processes of T3-T12, Ribs 1-12, Transverse processes of C2-C6,
Mastoid process of skull
• Actions:
• Extension & lateral bending of spine, extension of skull and cervical spine,
rotation of the face toward same side
Rhomboids
• Major:
• Origin:
• Spinous Processes of T2-T5
• Insertion:
• Vertebral border of scapula (lower 2/3)
• Minor:
• Origin:
• Spinous Processes of C7-T1
• Insertion:
• Vertebral border of scapula (upper 1/3)
• Actions:
• Retraction, elevation, downward rotation of scapula; Fixation of thoracic spine
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