Week 4 Oral quiz flashcards Q5-9

Question 1

Innervation of biceps brachii

Answer 1

Musculocutaneous n. C5-C7

Question 2

Proximal attachment of biceps brachi

Answer 2

(short head) tip of coracoid process of scapula, (long head) supraglenoid tubercle of scapula

Question 3

Distal attachment of biceps brachii

Answer 3

Tuberosity of radius and fascia of forearm via bicipital aponeurosis

Question 4

Action of biceps brachii

Answer 4

supinates forearm, in supine position it flexes forearm; short head resists dislocation of shoulder

Question 5

Innervation of coracobrachialis

Answer 5

Musculocutaneous n. C5-C7

Question 6

Proximal attachment of coracobrachialis

Answer 6

tip of coracoid process of scapula

Question 7

Distal attachment of coracobrachialis

Answer 7

middle third of medial surface of humerus

Question 8

Action of coracobrachialis

Answer 8

helps flex and adduct arm; resists dislocation of shoulder

Question 9

Innervation of brachialis

Answer 9

Musculocutaneous n. C5, C6/ Radial n. C5, C7

Question 10

Proximal attachment of brachialis

Answer 10

distal half of anterior surface of humerus

Question 11

Distal attachment of brachialis

Answer 11

coronoid process and tuberosity of ulna

Question 12

Action of brachialis

Answer 12

Flexes forearm in all positions

Question 13

What is the innervation of the posterior compartment of brachium?

Answer 13

Radial nerve

Question 14

Proximal attachment of triceps brachii long head

Answer 14

Infraglenoid tuberosity of scapula

Question 15

Distal attachement of triceps brachii

Answer 15

proximal end of olecranon of ulna and fascia of forearm

Question 16

Action of triceps brachii

Answer 16

extensor of forearm, resists dislocation of humerus. Especially important during adduction

Question 17

Proximal attachment of lateral head of triceps brachii

Answer 17

Posterior surface of humerus, superior to radial groove

Question 18

Proximal attachement of medial head of triceps brachii

Answer 18

Posterior surface of humerus, inferior to radial groove

Question 19

Proximal attachment of anconeus

Answer 19

lateral epicondyle of humerus

Question 20

Distal attachment of anconeus

Answer 20

lateral surface of olecranon and superior part of posterior surface of ulna

Question 21

Action of anconeus

Answer 21

Assists triceps in extending forearm; stabilizes the elbow joint; may abduct ulna during pronation

Question 22

What are the 3 cords of the brachial plexus?

Answer 22

lateral, posterior, medial

Question 23

Spinal level and terminal branches of lateral cord

Answer 23

musculocutaneous (C5-7) and median terminal branches

Question 24

Spinal level and terminal branches of medial cord

Answer 24

axillary and radial terminal branches

Question 25

Spinal level and terminal branches of posterior cord

Answer 25

median (C6-T1) and ulnar (C7,C8,T1) terminal branches

Question 26

Injury at axilla motor deficits

Answer 26

Injury at the axilla is “upstream” to all muscles that the radial nerve innervates. Results in motor loss in the extension of the elbow (triceps brachii), extension of the wrist (extensor carpi radialis longus), supination of the forearm (supinator), extension of the metacarpophalangeal joints of digits two through five (extensor digitorium) and the extension (extensor pollicis longus) and abduction (abductor pollicis longus) of the thumb. Loss of innervation to the forearm extensor compartment causes “wrist-drop” (patient cannot extend wrist so it hangs flaccid).

Question 27

Injury at axilla sensory deficits

Answer 27

Sensory loss of the posterior arm, forearm, and dorsum of the thumb

Question 28

Common causes of axilla radial nerve damage

Answer 28

overuse of crutches, shoulder dislocation, and repetitive “windmill” motion of arm used by softball pitchers

Question 29

Injury at radial groove motor deficits

Answer 29

Has all the same motor deficits as at the axilla except the triceps is usually not paralyzed (only weakened) because only the medial head innervation is affected and posterior arm cutaneous sensation remains intact. So elbow extension and posterior arm cutaneous sensation are spared with radial injury, because the injury occurs “downstream” of where the triceps and posterior arm skin are innervated. Sensation of posterior forearm may or may not be lost.

Question 30

Injury at radial groove sensory deficits

Answer 30

Sensation may or may not be lost

Question 31

Common causes of radial groove radial nerve damge

Answer 31

humeral fractures or “Saturday night palsy” (compression palsy that occurs when a patient falls asleep curled over their arm most likely while drunk)

Question 32

Elbow joint biomechanics

Answer 32

hinge type joint located 2-3 cm interior to epicondyles of humerus

Question 33

Articulations of elbow joint

Answer 33

humero-ulnar and humero-radial articulations

Question 34

Actions of elbow joint

Answer 34

flexion and extension

Question 35

Muscles involved in elbow flexion

Answer 35

Brachialis, Biceps brachii, Brachioradialis

Question 36

Muscles involved in elbow extension

Answer 36

Triceps brachii and anconeus

Question 37

What are the 9 major bony landmarks of the humerus?

Answer 37

1. greater tubercle 2. lesser tubercle 3. deltoid tubercle 4. crest of lesser tubercle and intertubercular groove 5. crest of greater tubercle 6. distal anterior surface of humerus 7. upper one-third of the frontal humerus 8. supracondylar ridge 9. medial epicondyle

Question 38

Deltoid tubercle insertion

Answer 38

Deltoid (origin at lateral one third of clavicle, acromion process, and spine of the scapula)

Question 39

Crest of lesser tubercle and intertubercular groove insertion

Answer 39

``` Latissimus Dorsi (origin at ribs 9-12, spinous processes T7-T12, iliac crest, thoracolumbar fascia) Teres Major (origin at the lateral border of the scapula slightly superior to the inferior angle) ```

Question 40

Crest of greater tubercle insertion

Answer 40

Pectoralis Major (origins at sternal body, manubrium, medial half of clavicle, costal cartiliage 1-6)

Question 41

Distal Anterior Surface of the Humerus origin

Answer 41

Brachialis (insertion at the coronoid process of the ulna)

Question 42

Insertion of upper 1/3 of frontal humerus

Answer 42

Coracobrachialis (origin at the coracoid process)

Question 43

Supracondylar ridge origin

Answer 43

Brachioradialis (insertion at the styloid process of the radius) Extensor Carpii Radialis Longus (insertion at dorsal base of the 2nd metacarpal)

Question 44

Medial epicondyle origin

Answer 44

Pronator Teres (insertion lateral radius distal to the insertion of the supinator muscle)