Elbow joint

Question 1

What is the thin sheet of fibrous tissue that connects the radius and Ulna called?

Answer 1

Interosseus membrane or Radio Ulnar syndemosis (fibres run down from radius to ulna)

Question 2

What are the articular surfaces of the bones involved in flexion/extension in the elbow joint?

Answer 2

• Trochlear notch of the ulna
• trochlea of humerus
• head of radius
• capitulum of humerus

Question 3

What is the articular surfaces of the bones involved in pronation and supination in the elbow joint?

Answer 3

• Head of radius

- Radial notch of Ulna

Question 4

What structures lie in the delto-pectoral girdle?

Answer 4

Cephali Vein -
(passes between the deltoid and pec major muscles and through the triangle. It empties into the axillary vein. The cephalic vein runs laterally to the radius.)

Question 5

What is the origin of Pectoralis Major?

Answer 5

• clavicular head
• medial 1/2 of clavicle
• sternocostal head

Question 6

What is the insertion of Pectoralis Major?

Answer 6

Lateral lip of the bicipital groove (intertubercular groove) of humerus

Question 7

What is the action of Pectoralis Major?

Answer 7

• flexion of humerus
• extension of humerus
• adducts
• medial rotation
• protraction of scapula
• retraction of scapula

Question 8

What is the nerve supply of pectoralis major?

Answer 8

• Lateral Pectoral Nerve

- Medial Pectoral Nerve

Question 9

What is the origin of Pectoralis MINOR?

Answer 9

-3rd to 5th Ribs (near costal margin)

Question 10

What is the insertion of Pectoralis MINOR?

Answer 10

Corocoid process of scapula

Question 11

What is the innervation of Pectoralis MINOR?

Answer 11

Medial Pectoral nerve (C8, T1)

Question 12

What is the origin of serratus anterior?

Answer 12

Ribs 1 - 8

Question 13

What is the insertion of serratus anterior?

Answer 13

Medial border of scapula

Question 14

What is the nerve supply of serratus anterior?

Answer 14

Long thoracic nerve (C5-C7)

Question 15

What is the function of serratus anterior?

Answer 15

holds scapula against thoracic wall

Question 16

What is the origin of subclavius?

Answer 16

first rib

Question 17

What is the insertion of subclavius?

Answer 17

subclavian groove of clavicle

Question 18

what is the nerve supply of subclavius?

Answer 18

subclavian nerve

Question 19

What would happen if the nerve supply of the serratus anterior was damaged?

Answer 19

Innervation of serratus anterior is the Long Thoracic Nerve.

It would cause winged scapula.

Question 20

What prevents hyperextension of the elbow

Answer 20

olecranon fossa

Question 21

What is bursitis of Elbow

Answer 21

Olecranon bursa protects the olecranon process of ulna.

repeated pressure causes swelling of bursa`

Question 22

Why is the radius more prone to subluxation or dislocation in childhood?

Answer 22

the annular ligament is relatively weak in childhood

Dislocation caused by swinging child by arms

Question 23

what is nursemaids elbow

Answer 23

subluxation or dislocation of the radius caused by weak annular ligament in children

Question 24

What are the 2 sites of epicondylitis?

Answer 24

1) Golfer’s elbow : medial epicondyle

2) Tennis elbow : lateral epicondyle

Question 25

What is avulsion of the medial epicondyle?

Answer 25

medial epicondyle breaks away from humerus. Ulnar nerve is at risk

Question 26

What nerve is most commonly affected by a humeral surgical neck fracture?

Answer 26

Axillary nerve

Question 27

What nerve is most commonly affected by a humeral shaft fracture?

Answer 27

Radius

Question 28

What is at risk with a supracondylar fracture?

Answer 28

Median nerve and brachial artery