Extensors

Question 1

Latissimus Dorsi

Answer 1

Origin: Spinous Process of T7-T12 & Iliac Crest
Insertion: Bicipital Groove
Innervation: Thoracodorsal Nerve C6-8

Question 2

Deltoid (Posterior Fibres)

Answer 2

Review

Question 3

Triceps (Long Head)

Answer 3

Origin:
Long Head - Infragelnoid Tubercle
Lateral Head - Posterior Surface of Humerus
Medial Head - Posterior Surface of Humerus, deep to Long & Lateral head
Insertion: Olecranon of Ulna
Innervation: Radial Nerve C7