Depressors

Question 1

Serratus Anterior

Answer 1

Origin- outer surfaces and sup borders of upper 8-9 ribs and intercostal fascia
Insertion- costal surface of med border of scapula

Innervation- Long Thoracic L5-7

Question 2

Pectoralis Minor (under R)

Answer 2

Origin- ribs 3-5 and their intercostal cartilages
Insertion- coracoid process of scapula

Innervation- Med/Lat Pectoral L6-8
Other action- accessory muscle of inspiration if necessary as attaches to ribs

Question 3

Trapezius (lower fibres)

Answer 3

Origin- spinous processes C7-T12 and supraspinous ligt
Insertion- by a triangular aponeurosis to med end of scapular spine

Innervation- Spinal Accessory (XI) C3-4