Superficial Back Muscle Structure Info Flashcards
latissimus dorsi s.c. segment
C6-8
latissimus dorsi attachments
from lower thoracic spinous processes, thoracolumbar fascia and iliac crest to the floor of the intertubercular sulcus of humerus
latissimus dorsi actions
adduction, extension, and medial rotation of humerus
latissimus dorsi innervation
thoracodorsal nerve
levator scapulae s.c. segment
C4-5
levator scapulae attachments
from transverse processes of C1-C4 to superior angle and superomedial border of scapula
levator scapulae actions
elevation and downward rotation of scapula
levator scapulae innervation
dorsal scapular nerve
(sensory: direct branches of C3-4)
rhomboids s.c. segment
C4-5
rhomboids attachments
-major: from spinous processes T2-5
-minor: from ligamentum nuchae and spinous processes C7-T1 to medial border of scapula
serratus anterior s.c. segment
C5-7
serratus anterior attachments
from the outer surfaces and superior borders of upper eight-ten ribs to the costal surface of the medial border of scapula
serratus anterior actions
scapular protraction and upward rotation
serratus anterior innervation
long thoracic nerve
subclavius s.c. segment
C5-6
subclavius attachments
from first rib and cartilage to the undersurface of clavicle
subclavius actions
depresses and stabilizes clavicle
subclavius innervation
subclavian nerve
trapezius s.c. segment
-accessory n. [CN XI] motor
-C3-4 sensory
trapezius attachments
-from superior nuchal line, external occipital protuberance, ligamentum nuchae, and cervical and thoracic spinous processes to clavicle, acromion, and scapular spine
trapezius actions
-scapular elevation (upper)
-depression (lower)
-retraction (middle)
-upward rotation (upper and lower)
trapezius innervation
-accessory nerve [CN XI], motor
-C3-4, sensory
rhomboids actions
-scapular retraction
-elevation (upper)
-downward rotation of scapula
rhomboids innervation
-dorsal scapular nerve
-sensory: direct branches of C3-4
