POSTERIOR AXIO-APPENDICULAR AND SCAPHOHUMERAL MUSCLES Flashcards
What is the purpose of intrinsic back muscles?
maintain posture and control movements of vertebral column
What are the 3 groups of the post. shoulder muscles?
- superficial posterior axio-appendicular (extrinsic shoulder)
- deep posterior axio-appendicular (extrinsic shoulder)
- scapulohumeral (intrinsic shoulder) muscles
what are the superficial posterior axio-appendicular muscles?
- trapezius
2. latissimus dorsi
what are the deep posterior axio-appendicular muscles?
- levator scapulae
2. rhomboids
what are the scapulohumeral muscles?
- deltoid
- teres major
- rotator cuff
what are the muscles of the rotator cuff ?
- supraspinatus
- infraspinatus
- teres minor
- subscapularis
what is the medial and lateral attachment of trapezius?
medial: sup. nuchal line, external occipital protuberance, nuchal lig., spinous processes of C7-T12
lateral: clavicle, acromion, spine of scapula
what are the 3 parts of the trapezius and their actions?
- descending (superior) part: elevates scapula
- middle part: retract scapula
- ascending (inferior) part: depresses scapula and lowers shoulders
what is the innervation of the trapezius?
cranial nerve XI
what is the medial and lateral attachments of the latissimus dorsi?
medial: spinous processes of inf. 6 thoracic vertebrae
lateral: intertubercular sulcus
what is the innervation of the latissimus dorsi?
thoracodorsal nerve
what is the action of the latissimus dorsi?
extend, adduct, medially rotate shoulder
raise body towards arms during climbing
what are the medial and lateral attachments of the levator scapulae?
medial: transverse processes of C1-C4
lateral: medial border of scapula
what is the innervation of the levator scapulae?
dorsal scapular, cervical spinal nerve
what is the action of levator scapulae?
elvelate scapula, tilts glenoid cavity by rotating scapula
bilaterally: extend neck
unilaterally: lateral flexion of neck