12/1: The Arm & Cubital Fossa

Question 1

The capitulum articulates with the

Answer 1

Radius

Question 2

The trochlea articulates with the

Answer 2

Ulna

Question 3

What are the 3 muscles of the arm?

Answer 3

a. Biceps brachii
b. Brachialis
c. Coracobrachialis

Question 4

What head of the biceps have a proximal attachment at the supraglenoid tubercle of the scapula?

Answer 4

Long head

Question 5

What actions does the biceps do?

Answer 5

a. Supines
b. Flex forearm

Question 6

Do the biceps pronate?

Answer 6

No

Question 7

What are the innervations for the arm muscles?

Answer 7

Musculocutaneous nerve (C5, C6, C7)

Question 8

What 3 muscles have proximal attachments on the coracoid process of the scapula?

Answer 8

a. Coracobrachialis
b. Short head
c. Pectoralis minor

Question 9

What is the distal attachment for the brachialis?

Answer 9

Coronoid process

Question 10

What muscle is the most important at flexing the forearm at the elbow joint?

Answer 10

Brachialis

Question 11

What muscle assists the triceps in extension of the forearm and is attached at the epicondyle and olecranon?

Answer 11

Anconeus

Question 12

What is the proximal attachment for the long head of the tricep?

Answer 12

Infraglenoid tubercle

Question 13

What is the proximal attachment for both the medial and lateral head of the tricep?

Answer 13

Posterior surface of humerus

Question 14

What innervates the anterior arm muscles (flexers)?

Answer 14

Musculocutanous nerve

Question 15

What inntervates the posterior arm muscles (extensors)?

Answer 15

Radial nerve

Question 16

What muscle is always counteracting the biceps and why?

Answer 16

Triceps; so they don’t over-flex

Question 17

What are the boundaries of the cubital fossa?

Answer 17

o Lateral: brachioradialis muscle
o Medial: pronator teres muscle
o Superior: an imaginary line between medial and lateral epicondyles of humerus o Roof: skin, superficial/deep fascia, bicipital aponeurosis
o Floor: supinator and brachialis muscles

Question 18

What nerve runs posterior to the medial epicondyle of the humerus?

Answer 18

Ulnar nerve

Question 19

What artery runs posterior to the medial epicondyle of the humerus?

Answer 19

Ulnar recurrent

Question 20

What is the long head attachment for the biceps brachii?

Answer 20

Supraglenoid tubercle of scapula

Question 21

What is the short head attachment to the biceps brachii?

Answer 21

Coracoid process of scapula

Question 22

What is the radial tuberosity and fascia of the forearm?

Answer 22

Bicipital aponeurosis

Question 23

What is the action of the biceps brachii?

Answer 23

• Supinates forearm, when supine will flex forearm
• resists dislocation of shoulder (short head)

Question 24

What is the innervation of the biceps brachii?

Answer 24

musculocutaneous nerve (C5,6)

Question 25

What is the attachment of the brachialis?

Answer 25

• distal 1/2 of anterior surface of humerus
• coronoid process and tuberosity of ulna

Question 26

What is the action of the brachialis?

Answer 26

Flexes forearm at elbow joint

Question 27

What is the blood supply of the brachialis?

Answer 27

Brachial artery

Question 28

What is the innervation of the brachialis?

Answer 28

Musculocutaneous nerve (C5,6)
- lateral portions may receive radial nerve contributions

Question 29

What is the attahment of the coracobrachialis?

Answer 29

• Coracoid process of scapula
• middle middle 1/3 of medial humeral surface

Question 30

What is the aciton of the coracobrachialis?

Answer 30

• flexes and adducts arm at shoulder joint
  -resists dislocation of shoulder joint

Question 31

What nerve innervates the corachobrachialis?

Answer 31

musculocutaneous nerve (C5,6)