Extrinsic muscles of the shoulder

Question 1

Origins of the trapezius

Answer 1

Skull,
ligamentum nuchae,
Spinous processes of C7-T12

Question 2

Attachments of trapezius

Answer 2

Clavicle,
Acromion,
Scapula spine

Question 3

What are the extrinsic muscles of the shoulder

Answer 3

Trapezius,
Latissimus dorsi,
Levator scapulae,
Rhomboid major,
Rhomboid minor

Question 4

Action of trapezius

Answer 4

Upper fibres elevate scapula and rotate scapula during abduction at shoulder,
Middle fibres retract scapula,
Lower fibres pull scapula inferiorly

Question 5

Innervation of trapezius

Answer 5

Accessory nerve

Question 6

Origin of latissimus dorsi

Answer 6

Lower part of back

Question 7

Attachment of latissimus dorsi

Answer 7

Intertubercular groove of humerus

Question 8

Action of latissimus dorsi

Answer 8

Extension, adduction and medial rotation of arm

Question 9

Innervation of latissimus dorsi

Answer 9

Thoracodorsal nerve

Question 10

Origin of levator scapulae

Answer 10

Transverse processes of C1-4 vertebrae

Question 11

Attachment of levator scapulae

Answer 11

Medial border of scapula

Question 12

Action of levator scapulae

Answer 12

Elevates the scapula

Question 13

Innervation of levator scapulae

Answer 13

Dorsal scapular nerve

Question 14

Origin of rhomboid major

Answer 14

Spinous processes of T2-5 vertebrae

Question 15

Attachment of rhomboid major

Answer 15

Medial border of scapula (between spine and inferior angle)

Question 16

Action of rhomboid major and minor

Answer 16

Retracts and rotates scapula

Question 17

Innervation of rhomboid major and minor

Answer 17

Dorsal scapular nerve

Question 18

Origin of rhomboid minor

Answer 18

Spinous processes of C7-T1 vertebrae

Question 19

Attachment of rhomboid minor

Answer 19

Medial border of scapula (level of spine)