Spine Flashcards
External Oblique Origin
Ribs 5-12
External Oblique Insertion
Pubic tubercle, Iliac crest, and Linea alba
External Oblique Innervation
Anterior rami nerves
External Oblique Action
Compresses and supports abdominal viscera, flexes and contralaterally rotates trunk
Internal Oblique Origin
Iliac crest, Thoracolumbar fascia
Internal Oblique Insertion
Ribs 10-12, Linea alba, Pecten pubis
Internal Oblique Innervation
Anterior Rami
Internal Oblique Action
Compresses and supports abdominal viscera, flexes and ipsilaterally rotates trunk
Transverse Abdominis Origin
Costal Cartilage 7-12, Iliac crest, Thoracolumbar fascia
Transverse Abdominis Insertion
Linea alba, Pecten pubis and Pubic crest
Transverse Abdominis Innervation
Anterior Rami
Transverse Abdominis Action
Compresses and supports abdominal viscera
Rectus Abdominis Origin
Pubic crest and pubic symphysis
Rectus Abdominis Insertion
Costal cartridges 5-7 and xiphoid process of sternum
Rectus Abdominis Innervation
Anterior Rami
Rectus Abdominis Action
Flexes trunk, compresses abdominal viscera and stabilizes tilt of pelvis
Levatores Costarum Origin
Transverse processes of cervical and thoracic
Levatores Costarum Insertion
Subjacent ribs
Levatores Costarum Action
Elevate ribs, assists with respiration and lateral flexion of vertebral column
Levatores Costarum Innervation
Posterior Rami
Quadratus Lumborum Origin
12th rib and transverse processes Lumbar spine
Quadratus Lumborum Insertion
Iliac crest and Iliolumbar ligament
Quadratus Lumborum Innervation
Anterior Rami
Quadratus Lumborum Action
Extends and laterally flexes vertebral column, fixes 12th rib during inspiration
Psoas Major Origin
Transverse processes, sides of bodies and intervening intervertebral disc in lumbar spine
Psoas Major Insertion
Lesser trochanter of Femur
Psoas Major Innervation
Anterior Rami
Psoas Major Action
Acting with iliacus, flexes hip and trunk; flexes vertebral column laterally; used to balance trunk in sitting position
SCM Origin
Manubrium of sternum and medial clavicle
SCM Insertion
Mastoid Process and Lateral Nuchal Line
SCM Innervation
Accessory Nerve (CN 11)
SCM Action
Bilaterally: flexes head at lower cervical vertebrae, flexes at upper cervical vertebrae, elevates thorax for respiration,
Unilaterally: turns face toward opposite side, tilts head to same side
Anterior Scalene Origin
Transverse processes C3-C6
Anterior Scalene Insertion
Scalene tubercle on 1st rib
Anterior Scalene Innervation
Anterior Rami
Anterior Scalene Action
Elevates 1st rib and flexes head laterally bends to same side
Middle Scalene Origin
Transverse processes of C5-C7
Middle Scalene Insertion
1st rib and subclavian groove of the clavicle
Middle Scalene Innervation
Anterior Rami
Middle Scalene Action
Elevates 1st rib and flexes head laterally bends to same side
Posterior Scalene Origin
Transverse processes C5-C7
Posterior Scalene Insertion
2nd Rib
Posterior Scalene Innervation
Anterior Rami
Posterior Scalene Action
Elevates 2nd rib and flexes head laterally bends to same side
Trapezius Origin
Spinous processes of C7-T12, Nuchal ligament and External occipital protuberance
Trapezius Insertion
Lateral Clavicle, Acromion and Spine of the Scapula
Trapezius Innervation
Accessory Nerve (CN11)
Trapezius Action
Elevates, retracts, and rotates scapula; Lower fibers depress scapula