Superficial Muscles of the Back

Question 0

Latissimus Dorsi

Answer 0

Origin: Spines of T6-12, Thoracolumbar Fascia, Iliac Crest
Insertion: Humerus (Intertubercule or Bicipital Groove)
Action: Adducts, extends, and medially rotates arm
Nerve: Thoracodorsal Nerve

Question 1

Trapezius

Answer 1

Origin: External Occipital Protuberance, Ligamentum Nuchae, Vertebral Spines of C7/T1-12
Insertion: Lateral 1/3 of Clavicle, Acromion, and Spine of Scapula
Action: Both elevates and depresses shoulder; retracts scapula; also extends head
Nerve: Accessory Nerve (Cranial Nerve 11)

Question 2

Levator Scapulae

Answer 2

Origin: Transverse processes of C4-C7
Insertion: Scapula (superior angle and medial border)
Action: Elevates and adducts scapula
Nerve: Dorsal Scapula Nerve

Question 3

Rhomboid Minor

Answer 3

Origin: Spines C7-T1
Insertion: Scapula (Medial Border)
Action: Elevates and Adducts Scapula
Nerve: Dorsal Scapula Nerve

Question 4

Rhomboid Major

Answer 4

Origin: Spines T2-T5
Insertion: Scapula (Medial Border to Inferior Angle)
Action: Elevates and Adducts Scapula
Nerve: Dorsal Scapular Nerve