estrinsic thorax muscles ( appendicular and intermediate and intermediate back region)

Question 1

trapezius

Answer 1

• origin: superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of vertebrae C7-T12
• insertion: posterior border of the clavicle, medial side of the acromion and posterior border of scapular spine
• action: moves scapula and head

Question 2

latissimus dorsi

Answer 2

• origin: ribs 10-11,spinous processes of T7-L5, thoracolumbar fascia, iliac crest
• insertion: crest of lesser tubercle
• action: extends,adducts and medially rotates the arm

Question 3

levator scapulae

Answer 3

• origin: transverse processes of C1-C4
• insertion: superior angle of scapula
• action: elevates scapula

Question 4

rhomboid minor

Answer 4

• origin: ligamentum nuchae, spinous processes of C7-T1
• insertion: medial border of the scapula superior to spine
• action: adducts(retracts) and elevates scapula

Question 5

rhomboid major

Answer 5

• origin: spinous processes of T2-T5 and supraspinous ligaments
• insertion: medial border of the scapula inferior to spine
• adducts and elevates scapula

Question 6

intermediate: serratus posterior superior

Answer 6

• origin: spinous processes of C7-T3
• insertion: superior borders of ribs 2-4
• action: elevates ribs

Question 7

intermediate: serratus posterior inferior

Answer 7

• origin: spinous processes of T11-L3
• insertion: inferior borders of ribs 9-12
• action: depresses ribs