axiohumeral muscles

Question 1

axiohumeral muscles

Answer 1

1. PECTORALIS MAJOR
2. LATISSIMUS DORSI
   cross multiple joints
   Large PCSA…strength
   contribute to all GHJ movements except ER

Question 2

pectoralis major: sternocostal head

Answer 2

prox attach: Sternum & 1st to 7th costal cartilages
distal attach: Lateral lip intertubercular sulcus of humerus
innervation: Medial & lateral pectoral nerves
action: Ext, medial rotation, horizontal F

Question 3

pectoralis major: clavicular head

Answer 3

prox attach: Medial 2/3 clavicle
distal attach: Lateral lip intertubercular sulcus of humerus
innervation: Medial & lateral pectoral nerves
action: F, Medial rotation, horizontal F

Question 4

latissiumus dorsi

Answer 4

prox attach: T7-12, lumbar & sacral spinous processes, posterior iliac crest & lower 3 ribs
distal attach: Intertubercular sulcus =/- inferior angle of scapula
innervation: Thoracodorsal N C6-8
action: Ext, Add, medial rotation

Question 5

muscles that stabilise (or depress) pectoral girdle when using upper limbs for weight bearing purposes such as using crutches or lifting trunk of chair

Answer 5

subclavius
pec major and minor
lat dorsi
inferior trap