Superficial Posterior Thoraco-Appendicular Muscles

Question 0

Where does the trapezius muscle insert?

Answer 0

Lateral 3rd of the clavicle, acromion and spine of scapula

Question 1

What is the origin for the trapezius muscle?

Answer 1

Medial 3rd of the superior nuchal line, nuchal ligament, EOP, spinous processes of C7-T12

Question 2

Which nerves innervate the trapezius?

Answer 2

Spinal Accessory Nerve; CN-XI - motor fibers

C3 & C4 Spinal Nerves - Pain & Proprioceptive Fibers

Question 3

What are the main actions of the trapezius?

Answer 3

Descending Superior Fibers - Elevates scapula
Ascending Inferior Fibers - Depresses scapula
Middle part - Retracts Scapula

Descending & Ascending parts act together in order to rotate the glenoid cavity superiorly.

Question 4

What is the origin of Latissimus Dorsi?

Answer 4

Spinous Processes of T7-T12; Thoracolumbar Fascia; Illiac Crest & Inferior 3 or 4 ribs

Question 5

Where does the Latissimus Dorsi insert?

Answer 5

Floor of the inter-tubercular sulcus of the humerus

Question 6

Which nerve innervates the Latissimus Dorsi?

Answer 6

Thoraco-dorsal nerve (C6, C7, C8)

Question 7

What actions do the Latissimus Dorsi perform?

Answer 7

Extends, adducts and medially rotates the shoulder joint; raises body toward arms while climbing. (Doing chin-ups)