Back Musculature

Question 1

Erector Spinae Origin and Insertion

Answer 1

Origin: Iliac crest of the pelvis, sacrum, spinous and transverse process T11-L5
Insertion: Ribs, Vertebrae, and base of skull

Question 2

Erector Spinae Isolated and Integrated Function

Answer 2

Isolated Function: Concentrically accelerates spinal extension, rotation, and lateral flexion
Integrated Function: eccentrically decelerates spinal flexion, rotation, and lateral flexion, dynamically stabilizes the spine during functional movements

Question 3

Quadratus Lumborum Origin and Insertion

Answer 3

Origin: Iliac crest
Insertion: 12th rib, transverse process L2-L5

Question 4

Quadratus Lumborum Isolated and Integrated Function

Answer 4

Isolated Function: Spinal lateral flexion

Integrated Function: Eccentrically decelerates contralateral lateral spinal flexion, isometrically stabilizes the LPHC

Question 5

Multifidus Origin and Insertion

Answer 5

Origin: Posterioir aspect of the sacrum, processes of the lumbar, thoracic, and cervical spine
Insertion: Spinous processes one to four segments above the origin

Question 6

Multifidus Isolated and Integrated Function

Answer 6

Isolated Function:concentrically accelerates spinal extension and contralateral rotation
Integrated Function: eccentrically decelerates spinal flexion and rotation, isometrically stabilizes the spine

Question 7

Latissimus Dorsi Origin and Insertion

Answer 7

Origin: Spinous processes of T7-T12, illac crest, thoracolumbar fascia, Ribs 9-12
Insertion: Inferior angle of the scapula, intertubercular groove of the humerus

Question 8

Latissimus Dorsi Isolated and Integrated Function

Answer 8

Isolated Function: Eccentrically decelerates shoulder flexion, abduction, and external rotation, eccentrically decelerates spinal flexion, Isometrically stabilizes the LPHC
Integrated Function: