Arm And Cubital Fossa

Question 1

Humeral head articulates with?

Answer 1

The glenoid cavity of the scapula; glenohumeral joint

Question 2

Intertubercular groove (sulcus)

Answer 2

Separates the greater and lesser tubercles

Question 3

Anatomical neck of humerus

Answer 3

Lies between the head and the tubercles

Question 4

Surgical neck of the humerus

Answer 4

• lies at the beginning of the body or shaft, distal to the tubercles
• more likely region of breakage

Question 5

Deltoid tuberosity

Answer 5

-anterolateral “bump” indicating insertion of deltoid muscle

Question 6

Radial groove

Answer 6

(Spiral groove)

• posterior aspect
• position of the radial nerve

Question 7

Trochlea

Answer 7

• Articulates with ulna
• medial to trochlea is a deep groove
• sulcus for ulnar nerve

Question 8

Capitulum

Answer 8

Articulates with the radius

Question 9

What are the 3 articulations of the elbow

Answer 9

• humeroulnar
• humeroradial
• proximal radioulnar

Question 10

What does the brachial vein anastomose with?

Answer 10

Paired vein and superficial veins

Question 11

Muscular branches to the muscles of the anterior compartment come off which artery?

Answer 11

Brachial artery

Question 12

Muscular branches to the posterior compartment come off which artery?

Answer 12

Deep brachial artery

Question 13

What does the deep brachial artery divide into?

Answer 13

Anterior and posterior descending branches surrounding the lateral epicondyle of the humerus

Question 14

What do the anterior and posterior descending branches anastomose with?

Answer 14

Collaterals from the brachial artery

Question 15

Profunda brachii artery

Answer 15

• first and largest branch
• this artery branches and follows the radial n. posteriorly around the radial groove to the posterior surface of the humerus

Question 16

Radial and ulnar arteries are found where?

Answer 16

At the level of the cubital fossa as a result of the brachial artery branching

Question 17

Radial artery

Answer 17

Has one recurrent branch

Question 18

Ulnar artery

Answer 18

Has anterior and posterior recurrent branches

Question 19

The anastomosis around the elbow is formed from?

Answer 19

• anterior and posterior branches of the deep brachial a.
• radial recurrent a.
• superior and inferior ulnar collaterals
• anterior and posterior ulnar recurrent arteries

Question 20

Superior and inferior ulnar collateral arteries arise from?

Answer 20

The brachial artery proximal to its division within the cubital fossa

Question 21

The muscles of the arm receive innervation from which nerves?

Answer 21

Radial and musculocutaneous nerves

Question 22

Where do the median and ulnar nerves descend?

Answer 22

Descend along the brachial artery thru the arm to reach the forearm
(Where they innervate muscles and skin)

Question 23

Where are the median and ulnar nerves formed?

Answer 23

The axilla

Question 24

The largest branch of the radial n.

Answer 24

• formed from the posterior cords
• curves posteriorly around the humerus in the radial groove (w/ the deep brachial a.)
• innervates the triceps and anconeus

Question 25

Musculocutaneous nerve

Answer 25

- small branch of the lateral cord - innervates the muscles of the anterior compartment of the arm - continues into the forearm as the lateral cutaneous nerve of the forearm

Question 26

Where do the median and ulnar nerves travel down?

Answer 26

The lateral and medial sides of brachial artery respectively

Question 27

Where is the median nerve protected?

Answer 27

In the cubital fossa by lying deep to the bicipital tendon

Question 28

Where does the ulnar nerve begin?

Answer 28

- In the anterior muscular compartment | - then pierces the medial intermuscular septum to continue distally along the medial head of the triceps brachii

Question 29

Superior border of the cubital fossa

Answer 29

Line crossing from medial to lateral epicondyles of the humerus

Question 30

Medial boundary of cubital fossa

Answer 30

Pronator teres muscle

Question 31

Lateral boundary of cubital fossa

Answer 31

Brachioradialis muscle

Question 32

Boundaries of the cubital fossa

Answer 32

- superior: line crossing from medial to lateral epicondyles of the humerus - medial: pronator teres muscle - lateral: brachioradialis muscle - floor: brachialis and supination muscles - roof: deep fascia including bicipital aponeurosis

Question 33

What does the cubital fossa contain?

Answer 33

- bicipital tendon - brachial artery and its terminal radial and ulnar branches - brachial veins - parts of the median and radial nerves

Question 34

Where does the median cubital vein run?

Answer 34

Runs in the loose connective tissue superficial to the deep fascia covering the cubital fossa

Question 35

Wrist drop

Answer 35

- long term paralysis or weakness of the extensor muscles of the wrist in the forearm - results from pressure on the radial nerve

Question 36

Damage to musculocutaneous nerve in the axilla results in?

Answer 36

Weakened flexion and supination of the forearm | -anesthesia of the lateral forearm is possible

Question 37

Damage to the median nerve results in?

Answer 37

- loss of sensation to the lateral portion of the palm | - loss of pronation, flexion of the wrist/digits, and complex thumb movements

Question 38

Damage to the ulnar nerve results in?

Answer 38

- weakened flexion and adduction of the wrist | - innervates fewer flexors in forearm so flexion is less severely affected than with median nerve damage

Question 39

Hitting your "funny bone" is?

Answer 39

- ulnar nerve | - results in tingling or anesthesia of the medial 2 digits

Question 40

Damage to brachial/axillary artery results in?

Answer 40

- loss of blood supply to the forearm causes paralysis of deep flexors - permanent damage may occur causing permanent flexion due to atrophy and shortening of deep flexor muscles