Back Inferior to C7 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; spine of scapula
Trapezius Innervation
Spinal Accessory Nerve (XI: motor fibers); C3,C4 spinal nerves (pain and proprioceptive fibers)
Trapezius Action
Descending fibers elevate scapula; ascending fibers depress scapula; Middle or all parts retract scapula; descending and ascending fibers rotate glenoid cavity superiorly
Trapezius Roots
C3;C4
Latissimus Dorsi Origin
Spinous Processes of inferior 6 thoracic vertebrae; thoracolumbar fascia; iliac crest; 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 towards arms during climbing
Latissimus Dorsi Roots
C6;C7:C8
Rhomboid Minor Origin
Nuchal Ligament; Spinous processes of C7 and T1 vertebrae
Rhomboid Minor Insertion
Smooth triangular area at medial end of scapular spine
Rhomboid Major Origin
Spinous processes of T2-T5 vertebrae
Rhomboid Major Insertion
Medial border of scapula from level of spine to inferior angle
Rhomboid Minor and Major Innervation
Dorsal Scapular nerve (C4,C5)
Rhomboid Minor and Major Roots
C4,C5
Levator Scapulae Origin
Posterior tubercles of transverse processes of C1-C4 vertebrae
Levator Scapulae Insertion
Medial border of scapula superior to root of scapular spine
Levator Scapulae Innervation
Dorsal Scapular nerve (C5); Cervical nerves C4 and C5
Levator Scapulae Roots
C3;C4
Levator Scapulae Action
Elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula
Serratus Posterior Superior Origin
Nuchal Ligament; Spinous processes of C7-T3
Serratus Posterior Superior Insertion
Superior borders of ribs 2-4
Serratus Posterior Superior Innervation
2nd to 5th intercostal nerves
Serratus Posterior Superior Action
Proprioception (elevate ribs)
Serratus Posterior Inferior Origin
Spinous processes of T11-L2
Serratus Posterior Inferior Insertion
Inferior borders of ribs 8-12 near the angle
Serratus Posterior Inferior Action
Proprioception (depress ribs)
Serratus Posterior Inferior Innervation
Anterior rami to T9-T12 thoracic spinal nerves
Serratus Posterior Inferior Roots
T9-T12
Erector Spinae (Iliocostalis, Longissimus, Spinalis) Origin
Broad tendon from posterior part of iliac crest; posterior surface of sacrum; sacroiliac ligaments; sacral and inferior lumbar spinous processes; supraspinous ligament
Iliocostalis Insertion
Lumborum, thoracis, cervicis; fibers run superiorly to angles of lower ribs and cervical transverse processes
Longissimus Insertion
Thoracis, Cervicis, Capitis; fibers run superiorly to ribs between tubercles and angles to transvers processes in thoracic and cervical regions; mastoid process of temporal bone
Spinalis Insertion
Thoracis, Cervicis, Capitis; fibers run superiorly to spinous processes in the upper thoracic region and to cranium
Erector Spinae Action
Acting Bilaterally: Extend vertebral column and head
Acting Unilaterally: Laterally Flex vertebral column
Semispinalis (of the transversospinalis) Origin
Arises from transverse processes of C4-T12
Semispinalis (of the transversospinalis) Insertion
Thoracis, Cervicis, Capitis; fibers run superomedially to occipital bone and spinous processes in thoracic and cervical regins, 4-6 segments
Multifidus (of the transversospinalis) Origin
Posterior Sacrum; posterior superior iliac spine; aponeurosis of erector spinae; sacroilliac ligaments; mammilary processes of lumbar vertebrae; transverse processes of T1-T3; articular processes of C4-C7
Multifidus (of the transversospinalis) Insertion
Lumbar region; fibers pass obliquely superomedially to entire length of spinous processes; 2-4 segments superior to proximal attachement
Rotatores (of the transversospinalis) Origin
Arise from transverse processes of vertebrae; best developed in thoracic region
Rotatores (of the transversospinalis) Insertion
Superomedially to attach to junction of lamina and transverse process of vertebra 1-2 segments superior to proximal attachment
Transversospinalis (Semispinalis, Multifidus, Rotatores) Innervation
Posterior rami of spinal nerves
Semispinalis Action
Unilaterally: rotates head and neck contralaterally, laterally flexes head and neck ipsilaterally
Bilaterally: extends head, cervical, and thoracic regions of the vertebral column
Multifidus Action
Stabilizes vertebrae during local movements of vertebral column
Rotatores Action
Stabilizes vertebrae and assist with local extension and rotation; proprioception
