Unit 1 - Back: Superficial Back Muscles (Ex. I) Flashcards
descending trapezius
O: EOP; ligamentum nuchae
I: L 1/3 of clavicle
Inn: accessory N (N XI); C3-C4
A: elevates scapula obliquely; rotates glenoid cavity superiorly; ipsilaterally flexes head and contralaterally rotates it
transverse trapezius
O: aponeurosis @ T1-T4 spinous processes
I: acromion
Inn: accessory N (N XI); C3-C4
A: retracts scapula medially
ascending trapezius
O: spinous processes of T5-T12
I: scapular spine
Inn: accessory N (N XI); C3-C4
A: depresses scapula medially
action of trap as a whole
steadies scapula on thorax
levator scapulae
O: transverse processes of C1-C4
I: S angle of scapula
Inn: dorsal scapular N (C4-C5)
A: elevates scapula medially while retracting I angle medially; mildly ipsilaterally flexes neck
rhomboid minor
O: spinous processes of C7, T1
I: medial border of scapula above scapular spine at root of spine
Inn: dorsal scapular N (C4-C5)
A: steadies scapula; elevates scapula medially
rhomboid major
O: spinous processes of T2-T5
I: medial border of scapula below scapular spine
Inn: dorsal scapular N (C4-C5)
A: steadies scapula; elevates scapula medially
vertebral latissimus dorsi
O: spinous processes of T7-T12; thoracolumbar fascia
I: floor of intertubercular sulcus of humerus
Inn: thoracodorsal N (C6-C8)
A: internal rotation; adduction; extension; respiration (“coughing”)
scapular latissimus dorsi
O: I angle of scapula
I: floor of intertubercular sulcus of humerus
Inn: thoracodorsal N (C6-C8)
A: internal rotation; adduction; extension; respiration (“coughing”)
costal latissimus dorsi
O: ribs 9-12
I: floor of intertubercular sulcus of humerus
Inn: thoracodorsal N (C6-C8)
A: internal rotation; adduction; extension; respiration (“coughing”)
iliac latissimus dorsi
O: P 1/3 of iliac crest
I: floor of intertubercular sulcus of humerus
Inn: thoracodorsal N (C6-C8)
A: internal rotation; adduction; extension; respiration (“coughing”)
