Scapular Region

Question 1

Origin of Supraspinatus

Answer 1

Supraspinous fossa (medial 2/3) of scapula

Question 2

Insertion of Supraspinatus

Answer 2

Superior facet of greater tuberosity of humerus

Question 3

Nerve Supply of Supraspinatus

Answer 3

Suprascapular nerve (C5, C6)

Question 4

Action of Supraspinatus

Answer 4

Abduction of arm from 0 to 18 degrees

Question 5

Origin of Infraspinatus

Answer 5

Infraspinous fossa (medial 2/3) of scapula

Question 6

Insertion of Infraspinatus

Answer 6

Middle facet of the greater tuberosity of the humerus

Question 7

Nerve Supply of Infraspinatus

Answer 7

Suprascapular nerve (C5, C6)

Question 8

Action of Infraspinatus

Answer 8

Lateral rotation of the arm

Question 9

Origin of Teres Minor

Answer 9

Lateral border (upper 2/3) of the scapula

Question 10

Insertion of Teres Minor

Answer 10

Inferior facet of the greater tuberosity of the humerus

Question 11

Nerve Supply of Teres Minor

Answer 11

Axillary Nerve (C5, C6)

Question 12

Action of Teres Minor

Answer 12

• Lateral Rotation

- Adduction of arm

Question 13

Origin of Teres Major

Answer 13

Posterior, inferior angle, scapula

Question 14

Insertion of Teres Major

Answer 14

Medial lip of bicipital groove of the humerus

Question 15

Nerve Supply of Teres Major

Answer 15

Lower Subscapular nerve (C5, C6)

Question 16

Action of Teres Major

Answer 16

• Medial Rotation
• Adduction
• Extension
  of the humerus

Question 17

Origin of Subscapularis

Answer 17

Subscapular fossa

Question 18

Insertion of Subscapularis

Answer 18

Lesser tuberosity of humerus

Question 19

Nerve Supply of Subscapularis

Answer 19

Upper and Lower Subscapular nerve (C5, C6)

Question 20

Action of Subscapularis

Answer 20

Rotates the humerus medially

Question 21

Origin of Deltoid

Answer 21

Anterior fibres: anterior border of lateral 1/3 of clavicle
Middle fibres: lateral margin of acromion
Posterior fibres: lower spinal crest of scapula

Question 22

Insertion of Deltoid

Answer 22

Deltoid tuberosity on the humerus shaft

Question 23

Nerve Supply of Deltoid

Answer 23

Axillary Nerve

Question 24

Action of Deltoid

Answer 24

Anterior fibres: flexion and medial rotation
Middle fibres: abduction from 18- 90 degrees
Posterior fibres: extension and lateral rotation of the humerus

“All shoulder actions except adduction”

Question 25

Rotator Cuff Muscles

Answer 25

• Supraspinatus
• Infraspinatus
• Teres Minor
• Subscapularis

Question 26

Superior Boundary of Quadriangular Space

Answer 26

Teres Minor

Question 27

Inferior Boundary of Quadriangular Space

Answer 27

Teres Major

Question 28

Medial Boundary of Quadriangular Space

Answer 28

Long head of triceps brachii

Question 29

Lateral Boundary of Quadriangular Space

Answer 29

Surgical neck of humerus

Question 30

Contents of Quadriangular Space

Answer 30

• Axillary nerve

- Posterior circumflex humeral artery

Question 31

Superior Boundary of Medial Triangular Space

Answer 31

Teres minor

Question 32

Inferior Boundary of Medial Triangular Space

Answer 32

Teres Major

Question 33

Lateral Boundary of Medial Triangular Space

Answer 33

Long head of triceps brachii

Question 34

Contents of Medial Triangular Space

Answer 34

Circumflex scapular vessels

Question 35

Superior Boundary of Lateral Triangular Space

Answer 35

Teres Major

Question 36

Medial Boundary of Lateral Triangular Space

Answer 36

Long head of triceps brachii

Question 37

Lateral Boundary of Lateral Triangular Space

Answer 37

Humerus

Question 38

Contents of Lateral Triangular Space

Answer 38

• Radial nerve

- Profunda brachii artery

Question 39

Origin of Axillary Nerve

Answer 39

Posterior cord of brachial plexus

Question 40

Course of Axillary Nerve

Answer 40

Passes backward through the quadriangular space to turn around the surgical neck of the humerus

Question 41

Branches of Axillary Nerve

Answer 41

Motor (Muscular): Deltoid and Teres minor

Sensory (Cutaneous): Upper lateral cutaneous nerve; supplies lower half of deltoid