Muscles of the back

Question 1

What are the muscles of the back?

Answer 1

Trapezius
Latissimus dorsi
Levator scapulae
Rhomboidus major
Rhomboidus minor

Question 2

Origin of the trapezius

Answer 2

Medial part of superior nuchal line
Ligamentum nuchae
Spines of all 12 thoracic vertebra

Question 3

Insertion of the trapezius

Answer 3

Posterior border lateral third of clavicle
Medial acromion
Upper lip of spine of scapula

Question 4

Nerve supply of the trapezius

Answer 4

Spinal part of accessory nerve

Question 5

Action of the trapezius

Answer 5

Elevate & retract the scapula
Abduction > 90 degrees

Question 6

Origin of the latissimus dorsi

Answer 6

T7-L5
Outer lip of iliac crest
Inferior angle of scapula

Image only showing the origin and insertion

Question 7

Insertion of the latissimus dorsi

Answer 7

Floor of intertubercular sulcus

Image only showing the origin and insertion

Question 8

Nerve supply of latissimus dorsi

Answer 8

Thoracodorsal nerve

Question 9

Action of the latissimus dorsi

Answer 9

Extends & rotates the humerus medially
Powerful adductor
Climbing, swimming

Question 10

Action of the levator scapulae

Answer 10

Elevates scapula

Question 11

Nerve supply of levator scapulae

Answer 11

Dorsal scapular nerve

Question 12

Action of rhomboids major and minor

Answer 12

Retract the scapula

Question 13

Nerve supply of rhomboids major and minor

Answer 13

Dorsal scapular nerve