Back Muscles Origin & Insertion

Question 1

Latissimus Dorsi

Answer 1

O: T7-L12 Spinous processes, sacrum, thoracolumbar fossa
I: Intertubercular groove of humerus
A: Adduction, extension, medial rotation of shoulder

Question 2

Teres Major

Answer 2

O: Inf. angle of scapula
I: Intertubercular groove of humerus
A: Adduction, extension, medial rotation of shoulder

Question 3

Teres Minor

Answer 3

O: Lateral border of scapula
I: Greater tuberosity of humerus
A: lateral rotation of shoulder

Question 4

Supraspinatus

Answer 4

O: Supraspinous fossa
I: Greater tubercle of humerus
A: Abduction, stabilization of shoulder

Question 5

Infraspinatus

Answer 5

O: Infraspinous fossa
I: Greater tubercle of humerus
A: Lateral rotation, stabilization of humerus

Question 6

Rhomboideus Major

Answer 6

O: T2-T5 Spinous processes
I: Medial border of scapula below spine
A: Adduction of scapulae

Question 7

Rhomboideus Minor

Answer 7

O: C7-T1 Spinous processes
I: Medial border of scapula above spine
A: Adduction of scapulae

Question 8

Levator Scapulae

Answer 8

O: C1-C4 transverse processes
I: Superior border of scapula
A: Adducts & elevates scapula

Question 9

Trapezius

Answer 9

O: Ext. occipital protuberance, T1-T12 spinous processes
I: Lateral 3rd clavicle, acromion @ scapular spine
A: Elevation, depression, adduction, and stabilization of scapula