Extrinsic Back Muscles (Not organized by layer) Flashcards
Trapezius - Attachments
FROM:
*superior nuchal line
*external occipital protuberance
*ligamentum nuchae
*cervical & thoracic spinous processes
TO:
*clavicle
*acromion
*scapular spine
Trapezius - Innervation
*accessory nerve (CN XI; motor)
*C3-4 (sensory)
Trapezius - Actions
*scapular elevation (upper)
*depression (lower)
*retraction (middle)
*upward rotation (upper & lower)
Latissimus dorsi - Attachments
FROM
*lower thoracic spinous processes
*thoracolumbar fascia
*iliac crest
TO:
*floor of the intertubercular sulcus of the humerus
Latissimus dorsi - Actions
adduction, extension & medial rotation of humerus
Latissimus dorsi - Innervation
thoracodorsal nerve (C6-8)
Levator scapulae - Attachments
FROM
*transverse processes of C1-C4
TO:
*the superior angle
*superomedial border of the scapula
Levator scapulae - Actions
elevation & downward rotation of the scapula
Levator scapulae - Innervation
*dorsal scapular nerve (C4-5)
*sensory: direct branches of C3-4
Rhomboids - Attachments
FROM
*major: from spinous processes T2-5
*minor: from ligamentum nuchae & spinous processes C7-T1
TO:
*medial border of the scapula
Rhomboids - Actions
scapular retraction, elevation (upper) & downward rotation
Rhomboids - Innervation
*dorsal scapular nerve (C4-5)
*sensory: direct branches of C3-4
Serratus posterior superior - Attachments
FROM
*spinous processes of C7-T3
TO:
*inferior borders of ribs 2-5
Serratus posterior superior - Action
proprioception of thoracic wall
Serratus posterior superior - Innervation
intercostal nn. (T1-4)
