Muscles of the Posterior Scapular Region

Question 1

Supraspinatus origin

2

Answer 1

• medial 2/3 of supraspinous fossa

- deep fascia covering the muscle

Question 2

Supraspinatus insertion

1

Answer 2

superior-most facet, Greater Tubercle, Humerus

Question 3

Supraspinatus innervation

nerve & spinal segments

Answer 3

• Suprascapular Nerve (C5 & C6)

Question 4

Major spinal segment innervationg Supraspinatus & Infraspinatus?

Answer 4

C5

Question 5

Function of Suprasinatus

Answer 5

= Rotator Cuff Muscle

- initiation of arm abduction, up to 15 degrees!

Question 6

Infraspinatus origin

2

Answer 6

• medial 2/3 of infraspinous fossa

- deep fascia covering the muscle

Question 7

Infraspinatus insertion

1

Answer 7

middle facet, posterior surface, Greater Tubercle, Humerus

Question 8

Infraspinatus innervation

nerve & spinal segments

Answer 8

Suprascapular Nerve (C5 & C6)

Question 9

Function of Infraspinatus

2

Answer 9

= Rotator Cuff Muscles

- Lateral rotation of the arm at glenohumeral joint

Question 10

Origin of Teres Minor

& what is this adjacent to?

Answer 10

upper 2/3 of flattened strip of bone on Posterior Surface of the Scapula
(adjacent to Lateral Border)

Question 11

Where does Teres Minor insert?

Answer 11

Inferior facet, posterior surface, Great Tubercle, Humerus

Question 12

Innervation of Teres Minor?

nerve & spinal segment

Answer 12

Axillary Nerve

C5 & C6

Question 13

Function of Teres Minor

2

Answer 13

= Rotator Cuff Muscle

- Lateral rotation of the arm at Glenohumeral joint

Question 14

Origin of Teres Major

Answer 14

Posterior surface of the inferior angle of the Scapula

Question 15

Teres Major insertion

Answer 15

Medial Lip, Intertubercular Sulcus, Humerus

Question 16

Innervation of Teres Major

nerve and spinal segments

Answer 16

Inferior Subscapular Nerve = C6, C7, C8

Question 17

Major spinal segment providing innervation of Teres Major? What are the others?
(3)

Answer 17

C7

C6 & C8

Question 18

Function of Teres Major

2

Answer 18

• Medial rotation of arm, at Glenohumeral Joint

- Extension at Gh Joint

Question 19

Origin of Triceps Brachii (Long Head)

Answer 19

Infraglenoid Tubercle, Scapula

Question 20

Insertion of Triceps Brachii (Long Head)

What does it insert with?

Answer 20

Olecranon Process, Ulna

Shares a common tendon of insertion with the Lateral and Medial Heads of Triceps Brachii

Question 21

Innervation of Triceps Brachii (Long Head)?

nerve & spinal segments

Answer 21

Radial Nerve = C6 C7 C8

Question 22

Major innervating spinal segment of Triceps Brachii (Long Head)

Answer 22

C7

Question 23

Functions of Triceps Brachii (Long Head)
(main & accessory roles)
(3)

Answer 23

Extension of the forearm, at Elbow

+ Adductor of the arm at Gh joint (accessory)
+ Extensor of the arm at Gh joint (accessory)