Axioappendicular mm

Question 1

Lattisimus Dorsi

Answer 1

attachments- from lower thoracic spinous processes, thoracolumbar fascia & iliac crest to the floor of the intertubercular sulcus of the humerus

actions- adduction, extension & medial rotation of humerus

innervation- thoracodorsal nerve

common spinal cord segment: (C6-8)

Question 2

Levator Scapulae

Answer 2

attachments- from transverse processes of C1-C4 to the superior angle & superomedial border of the scapula

actions- elevation & downward rotation of the scapula

innervation- dorsal scapular nerve (sensory: direct branches of C3-4)

common spinal cord segment: (C4-5)

Question 3

Pectoralis Major

Answer 3

attachments- from anterior border of clavicle, costal cartilages, manubrium/body of sternum & aponeurosis of the external oblique to the lateral lip of the intertubercular sulcus of the humerus

actions- humeral adduction, flexion & medial rotation (sternocostal portion assists with extension of the flexed arm)

innervation- medial pectoral nerve (sternocostal head) & lateral pectoral nerve (clavicular head)

common spinal cord segment: (clavicular head C5-6; sternocostal head C7-T1)

Question 4

Pectoralis Minor

Answer 4

attachments- from outer surfaces of ribs 3-5 to the coracoid process of scapula

actions- anterior tilt of scapula; assists with depression of the shoulder & forced inspiration

innervation- medial & lateral pectoral nerves

common spinal cord segment: (C5-T1)

Question 5

Rhomboids

Answer 5

attachments- major: from spinous processes T2-5; minor: from ligamentum nuchae & spinous processes C7-T1 to the medial border of the scapula

actions- scapular retraction, elevation (upper) & downward rotation

innervation- dorsal scapular nerve (sensory: direct branches of C3-4)

common spinal cord segment: (C4-5)

Question 6

Serratus Anterior

Answer 6

attachments- from the outer surfaces & superior borders of upper eight-ten ribs to the costal surface of the medial border of the scapula

actions- scapular protraction & upward rotation

innervation- long thoracic nerve

common spinal cord segment: (C5-7)

Question 7

Subclavius

Answer 7

attachments- from 1st rib & cartilage to the inferior surface of the clavicle

actions- depresses & stabilizes the clavicle

innervation- subclavian nerve

common spinal cord segment: (C5-6)

Question 8

Trapzius

Answer 8

attachments- from the superior nuchal line, external occipital protuberance, ligamentum nuchae, & cervical & thoracic spinous processes to the posterior border of the clavicle, acromion & scapular spine crest

actions- scapular elevation (upper), depression (lower), retraction (middle) & upward rotation (upper & lower)

innervation- accessory nerve(C N XI; motor)

common spinal cord segment: (Accessory n. [CN XI] motor; C3-4 sensory)