Back Muscles

Question 0

Actions of the trapezius?

Answer 0

Descending part elevates the scapula
Ascending arm depresses the scapula
Middle part retracts the scapula

Descending and ascending work together to superiorly rotate the glenoid cavity.

Question 1

Innervation of the trapezius?

Answer 1

Motor: Spinal accessory nerve
Sensory: C3&4 spinal nerves

Question 2

Attachments of the trapezius?

Answer 2

Skull down to T12

Attaches to posterior surface of scapula and clavicle

Question 3

Attachments of the latissimus dorsi?

Answer 3

Thoracic spine, iliac crests and inferior 3 ribs

Converges to a tendon that attaches to intertubercular groove of humerus

Question 4

Innervation of the latissimus dorsi?

Answer 4

Thoracodorsal nerve (C6, 7, 8)

Question 5

Action of the latissimus dorsi?

Answer 5

Extends, adducts and medially rotates the humerus.

Raises body towards arms during climbing

Question 6

Innervation of the levator scapulae?

Answer 6

Dorsal scapula nerve (C4 and 5)
Cervical nerve (C3 and 4)

Question 7

Action of the levator scapulae?

Answer 7

Elevates scapula

Rotates scapula to tilt glenohumeral joint inferiorly

Question 8

Attachments of the levator scapulae?

Answer 8

Transverse processes of C1-4

Attaches to medial borders of scapula

Question 9

Where do the rhomboids lie in relation to the trapezius muscle?

Answer 9

They lie deep to the trapezius muscle

Question 10

Attachments of the rhomboid major?

Answer 10

T2-5 vertebrae

Medial border of the scapula

Question 11

Attachments of the rhomboid minor?

Answer 11

C7-T1

Medial border of the scapula

Question 12

Innervation of the rhomboids?

Answer 12

Dorsal scapula nerve (C4&5)

Question 13

Actions of the rhomboids?

Answer 13

Retract scapula and rotate its glenoid cavity inferiorly

Fix scapula to thoracic wall

Question 14

Attachments of the deltoid?

Answer 14

Scapula and clavicle

Deltoid tuberosity on lateral surface of the humerus

Question 15

Innervation of the deltoid?

Answer 15

Axillary nerve (C5&6)

Question 16

Actions of the deltoid?

Answer 16

Anterior: flexes arm at shoulder
Posterior: extends arm at shoulder
Middle: abduction of the arm after 15*

Question 17

Innervation of the teres major?

Answer 17

Lower subscapular nerve

Question 18

Attachments of the teres major?

Answer 18

Inferior angle of the scapula

Intertubercular groove of humerus

Question 19

Actions of the teres major?

Answer 19

Adducts shoulders

Medially rotates arms

Question 20

Test for accessory nerve?

Answer 20

Test function of the trapezius

Patient elevates shoulders against resistance

Question 21

How do you test the dorsal scapula nerve?

Answer 21

Test function of rhomboids

Patient places hands on hips, pushes elbows posteriorly against resistance

Question 22

How do you test the axillary nerve?

Answer 22

Abduct arm from 15* against resistance. Deltoid can be seen and palpated.