Back Inferior to C7 Muscles Flashcards
Trapezius Origin
Medial third of superior nuchal line; external occipital protuberance; nuchal ligament; spinous processes of C7-T12 vertebrae
Trapezius Insertion
Lateral third of clavicle; acromion and spine of scapula
Trapezius Innervation
Spinal accessory nerve (CN XI) (motor fibers) and C3, C4 spinal nerves (pain and proprioceptive fibers)
Trapezius Action
Descending part elevates; ascending part depresses; and middle part(or all parts together) retracts scapula; descending and ascending parts act together to rotate glenoid cavity superiorly
Trapezius Roots
C3,C4
Latissimus Dorsi Origin
Spinous processes of the inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs
Latissimus Dorsi Insertion
Floor of intertubercular sulcus of humerus
Latissimus Dorsi Innervation
Thoracodorsal nerve (C6, C7, C8)
Latissimus Dorsi Action
Extends, adducts, and medially rotates humerus; raises body toward arms during climbing
Latissimus Dorsi Roots
C6, C7, C8
Rhomboid Minor Origin
Minor: nuchal ligament; spinous processes of C7 and T1 vertebrae
Rhomboid Minor Insertion
Minor: smooth triangular area at medical and scapular spine
Rhomboid Minor Innervation
Dorsal scapular nerve (C4, C5)
Rhomboid Minor Action
Retract scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall
Rhomboid Minor & Major Roots
C4, C5
Levator Scapulae Origin
Posterior tubercles of transverse processes of C1-C4 vertebrae
Levator Scapulae Insertion
Medical border of scapula superior to root of scapular spine
Levator Scapulae Innervation
Dorsal scapular (C5) and cervical (C3, C4) nerves
Levator Scapulae Action
Elevates scapula and rotates its glenoid cavity inferiorly by rotating scapula
Levator Scapulae Roots
C3, C4
Serratus Posterior Superior Origin
Nuchal ligament, spinous processes of C7 to T3 vertebrae
Serratus Posterior Superior Insertion
Superior borders of 2nd to 4th ribs
Serratus Posterior Superior Innervation
2nd to 5th intercostal nerves
Serratus Posterior Superior Action
Proprioception (elevate ribs)
Serratus Posterior Inferior Origin
Spinous processes of T11 to L2 vertebrae
Serratus Posterior Inferior Insertion
Inferior borders of 8th to 12th ribs near their angles
Serratus Posterior Inferior Innervation
Anterior rami to T9 to T12 thoracic spinal nerves
Serratus Posterior Inferior Action
Proprioception (depress ribs)
Serratus Posterior Inferior Roots
T9-T12
Erector Spinae: Iliocostalis Origin
Arises by a broad tendon from posterior part of iliac crest, posterior surface of sacrum, sacroiliac ligaments, sacral and inferior lumbar spinous processes, and supraspinous ligament