Lecture 30 the Arm and Cubital Fossa

Question 1

What is the cubital fossa?

Answer 1

• the junction between the arm and forearm regions

Question 2

What vein do we draw blood from?

Answer 2

• cephalic vein

Question 3

Why do we not draw blood from the basilic vein?

Answer 3

• it is associated with the brachial artery and median nerve so it is not as safe to draw blood from

Question 4

What is the lateral boundary of the cubital fossa?

Answer 4

• brachioradialis muscle

Question 5

What is the medial boundary of cubital fossa?

Answer 5

• pronator teres muscle

Question 6

What is the superior border of the cubital fossa?

Answer 6

• imaginary line between medial and lateral epicondyles of humerus

Question 7

What is the roof of cubital fossa?

Answer 7

• skin, superficial and deep fascia and bicipital aponeurosis

Question 8

What is the floor of the cubital fossa?

Answer 8

• supinator, (deep, not shown) and brachialis muslce

Question 9

What muscle has two heads that the median nerve travels between?

Answer 9

• pronator teres

Question 10

What are the contents of the cubital fossa?

Answer 10

• median nerve
• brachial a. with bifurcation of radial and ulnar arteries
• tendon of biceps brachii and bicipital aponeurosis
• radial nerve
  (deep and superficial)

Question 11

What nerves travel through the anterior division of the arm but do not innervate it?

Answer 11

• the medial and ulnar nerves

travel along side brachial artery and veins and collateral artery and veins in neurovascular bundle

Question 12

Where does the ulnar nerve run in relationship to the medial epicondyle of the humerus?

Answer 12

• posterior to medial epicondyle of humerus

Question 13

What artery runs with the ulnar nerve posterior to medial epicondyle?

Answer 13

• posterior ulnar recurrent artery

Question 14

What nerve innervates the anterior compartments of the brachium?

Answer 14

• musculocutaneous nerve

Question 15

What actions do the musculocutaneous nerve stimulate?

Answer 15

• flexion

Question 16

What nerve is found in the posterior compartment (extensor)?

Answer 16

• radial nerve with collateral arteries and vein

Question 17

What cutenous nerve is associated with left pain in arm from heart attack?

Answer 17

• intercostobrachial nerve (comes from T2)

Question 18

Where do the supraclavicular nerves come from and what do they innervate?

Answer 18

• cervical plexus and skin around deltoid and pecs

Question 19

What cutaneous nerves come from the radial nerve?

Answer 19

• posterior cutaneous nerve of arm
• posterior cutaneous nerve of arm (near armpit)
• posterior cutaneous nerve of forearm

Question 20

What branch of the brachial plexus does the superior lateral cutaneous nerve come from?

Answer 20

• axillary nerve

Question 21

Where does medial cutaneous nerve of arm come from?

Answer 21

• medial cord of brachial plexus

Question 22

Where does the lateral cutaneous nerve of forearm come from??

Answer 22

• it terminal musculocutaneous nerve

emerges in cubital region

Question 23

What gives rise to brachial artery?

Answer 23

• axillary artery

Question 24

what gives rise to profunda brachii a.?

Answer 24

• brachial a

Question 25

What branches off of the profunda brachii a?

Answer 25

- post. descending branch (middle collateral) - anter. descending branch (radial collateral)

Question 26

Where do the superior and inferior ulnar collateral a. come from?

Answer 26

- brachial a.

Question 27

What does the anterior ulnar recurrent artery anastomose with?

Answer 27

- inferior ulnar collateral

Question 28

Superior ulnar collateral anastomose with?

Answer 28

- posterior ulnar collateral

Question 29

Radial collateral artery anastomoses with

Answer 29

radial recurrent artery

Question 30

Radial collateral artery anastomoses with

Answer 30

- radial recurrent artery

Question 31

where does the long head of the biceps brachii originate?

Answer 31

- supraglenoid tubercle of scapula

Question 32

Where does the short head of biceps brachii originate?

Answer 32

- coracoid process of scapula

Question 33

Where is the distal attachment (insertion) of biceps?

Answer 33

- radial tuberosity and fascia of forearm via bicipital aponeurosis

Question 34

What is the actions of biceps?

Answer 34

- supinates forearm, when supine will flex forearm | - resists dislocation of shoulder (short head)

Question 35

What innervates the biceps?

Answer 35

- musculocutaneous nerve

Question 36

What muscle has the same function as the short head of biceps?

Answer 36

- coracobrachialis

Question 37

Where is the origin of the coracobrachialis?

Answer 37

- coracoid process of scapula

Question 38

Where is the insertion of coracobrachialis?

Answer 38

- middle 1/3 of medial humeral surface

Question 39

What is the action of coracobrachialis?

Answer 39

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

Question 40

What innervates coracobrachialis?

Answer 40

- musculocutaneous nerve

Question 41

What three muscles attach to corocoid process?

Answer 41

- coracobrachialis - short head of biceps - pectoralis minor

Question 42

What muscle is the strongest and main flexor?

Answer 42

- brachialis

Question 43

What is the origin of brachialis muscle?

Answer 43

- distal 1/2 of anterior surface of humerus

Question 44

What is the insertion of brachialis muscle?

Answer 44

- coronoid process and tuberosity of ulna

Question 45

What is the innervation of brachialis muscle?

Answer 45

- musculocutaneous | - lateral portions may recieve radial nerve contributions

Question 46

What is the deepest head of the triceps?

Answer 46

- medial head

Question 47

What is the function of the triceps?

Answer 47

- extension