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Lumbosacral Muscle

QuestionAnswer
Rectus Abdominis O: Pubic Crest I: Costal cartilage of the 5th-7th ribs A: Flexion of the lumbar spine against gravity and posterior rotation of the pelvis
External Oblique O: 5th-8th ribs (anterior fibers) 9th-12th ribs (lateral fibers) I: Via an app neurosis to the lines alba (anterior fibers) ASIS (lateral fibers) A: Flexion of the lumbar spine (bilateral contraction) Rotation of the lumbar spine to the opposite side
Internal Oblique O: Lateral two-thirds of the inguinal ligament I: Linea alba (all fibers) A: Support of the abdominal viscera and rotation of the lumbar spine to the same side
Latissimus Dorsi O: Spinous processes of T6-T12 and the lumbar vertebra I: Intertubercle groove of the humerus A: Extension of the spine and stabilization of the lumbar spine
Trapezius (middle one-third) O: spinous processed of the 7th cervical vertebra and T1-T5 I: Acromion process A: Retraction of scapula
Trapezius (lower one-third) O: Spinous processes and supraspinal ligaments of T8-T12 I: Spine of the scapula A: Depression of scapula
Rhomboid Major O: Spinous processes of T2,T3, T4, and T5 I: Vertebral border of scapula A: Retraction of scapula and elevation of scapula
Rhomboid Minor O: Spinous processes C7 and T1 I: Veterbral borer of scapula A: Retraction of scapula
Iliocostalis Lumborum O: Posterior aspect of the iliac crest I: Inferior angle of ribs 6-12 A: Extension of spinal column (bilateral) and lateral bending of spinal column to same side (unilateral)
Ilicotalis Thoracis O: Ribs 6-12 I: Ribs 1-6 A: Extension of spinal column (bilateral) lateral bending of spinal column too the same side (unilateral)
Longissimus Thoracis O: Common erector spinae tendon I: Transverse process of T3-T21 A: Extension of spinal column (bilateral) and lateral bending of spinal column (unilateral)
Spinalis Thoracis O: Common erector spinae tendon I: Spinous processes of upper thoracic spine A: Extension of spine (bilateral) and lateral bending of the spine to the same side (unilateral)
Semispinalis Thoracis O: Transverse process I: Attaches to a spinous process 5 or 8 vertebra above the origin A: Extension of thoracic and cervical spine (bilateral) and rotation to the opposite side (unilateral)
Multifidus O: Superior aspect of sacrum I: Spinous process A: Stabilization of vertebral column (bilateral) and rotation of spine to opposite side (unilateral)
Quadratics Lumborum O: Inferior portion of the 12th rib I: iliac crest iliolumbar ligament
Rotatores O: Transverse process I: Spinous process of teh vertebra immediately above the origin A: Extension of the spine (bilateral) and rotation of spine (unilateral) and stabilization of vertebral column
Created by: dayziana
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