The Back (Extrinsic muscle orgin and insertions)

Question 1

Latissimus Dorsi (O & I)

Answer 1

O: spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3 ribs

I: floor of intertubercular sulcus (bicipital groove) of humerus

Question 2

Rhomboid Major (O & I)

Answer 2

O: spinous processes of T2-T5

I: medial border of scapula from level of spine to inferior angle

Question 3

Rhomboid minor (O & I)

Answer 3

O: Nuchal ligament, spinous processes of C7 & T1

I: medial end of scapular spine

Question 4

Levator scapulae (O & I)

Answer 4

O: posterior tubercles of transverse processes of first 4 cervical vertebrae

I: medial border of scapula, superior part of scapular spine

Question 5

Serratus posterior superior (O & I)

Answer 5

O: nuchal ligament, spinous processes of C7-T3 vertebrae

I: superior border of ribs 2-4

Question 6

Serratus posterior inferior (O & I)

Answer 6

O: spinous process of T11-L2 vertebrae

I: inferior borders of ribs 8-12, near their angles

Question 7

Trapezius (O & I)

Answer 7

Proximal Attachment (origin): External occipital protuberance of skull, nuchal ligament, spinous processes of C7-T12 vertebrae

Distal attachment (insertion): lateral third of clavicle on the anterior side, acromion, and spine of scapula