USMLE Bible 1

Question 0

Common cause of radial nerve injury.

Answer 0

Injury to the shaft of the humerus.

Question 1

Common cause of median nerve injury.

Answer 1

Injury to the supracondyle of the humerus.

Question 2

Common injury to the ulnar nerve

Answer 2

injury to the medial epicondyle of the humerus

Question 3

Common cause of injury to the axillary nerve

Answer 3

Injury to the surgical neck of the humerus and or anterior shoulder dislocation.

Question 4

Common injury to the musculocutaneous nerve.

Answer 4

compression between biceps aponeurosis and bachialis fascia.

Question 5

Motor deficit in median nerve injury.

Answer 5

forearm pronation
wrist flexion
finger flexion
thumb movement
long term thenar atrophy

Question 6

Median nerve sensory deficit.

Answer 6

loss of sensation in the thumb
lateral aspect of the palm
first 2.5 fingers index, middle, and half of the ring finger

Question 7

Motor deficit in radial nerve injury.

Answer 7

loss of triceps reflex
brachiradialis reflex
extensor carpi radialis longus (classic wrist drop)

Question 8

Sensory deficit in radial nerve injury.

Answer 8

loss of sensation to the posterior antebrachial cutaneous and the posterior brachial cutaneous

Question 9

Motor deficit in ulnar nerve injury

Answer 9

causes impaired flexion and adduction of the wrist as well as impaired adduction of the ulnar 2 fingers and thumb

Question 10

sensory deficit in ulnar nerve injury

Answer 10

Loss of sensation to the medial aspect of the palm as well as loss of sensation to the pinky and medial 1/2 of the ring finger

Question 11

Motor deficit im axillary nerve injury

Answer 11

Loss of complete deltoid movement

Question 12

Sensory deficit of axillary nerve injury

Answer 12

Loss of sensation over the deltoid muscle as well as the skin covering the inferior aspect of the deltoid.

Question 13

Motor deficit of the musculocutaneous nerve.

Answer 13

Loss of function of coracobrachialis, biceps, and brachialis muscle.

Question 14

Sensory deficit in musculocutaneous nerve injury

Answer 14

Loss of sensation to the radial aspect of the forearm

Question 15

Wrist drop is an injury to the

Answer 15

Radial nerve

Question 16

The muscles innervated by the radial nerve include

Answer 16

Mnemonic for muscles innervated by the radial nerve:

BEST

Brachioradialis
Extensors of wrist/fingers
Supinator

Question 17

Claw hand is a result of

Answer 17

Ulnar nerve injury

Question 18

Paralysis of the arm due to injury of the superior trunk of the brachial plexus (C5 and C6 roots)

Answer 18

Erb-Duchenne Palsy

Question 19

What is a common cause of Erb-Duchenne palsy?

Answer 19

Shoulder dystocia at birth

Question 20

Classic presentation of Erb-Duchenne palsy

Answer 20

Abductor paralysis (hanging limbs side to side)
Paralysis of lateral rotators (medial rotation)
Loss of biceps action (forearm pronation)

Question 21

Compression of the subclavian artery and C8-T1

Answer 21

Thoracic outlet syndrome

Question 22

Classic presentation of thoracic outlet syndrome

Answer 22

-‐ Thenar and hypothenar atrophy
-‐ Interosseus muscle atrophy
-‐ Sensory deficit of the medial forearm and hand
-‐ Loss of radial pulse upon head movement to the affected side

Question 23

Thenar muscles

Answer 23

Opponens pollicis
Abductor pollicis brevis
Flexor pollicis brevis

Question 24

Hypothenar muscles

Answer 24

Opponens digiti minimi Abductor digiti minimi Flexor digiti minimi

Question 25

Rotor cuff muscles

Answer 25

Supraspinatus Infraspinatus Teres minor Subscapularis

Question 26

The recurrent laryngeal nerve is a branch of

Answer 26

Vagus nerve

Question 27

The recurrent laryngeal nerve supplies all intrinsic muscles of the larynx except the

Answer 27

Cricothyroid

Question 28

The right recurrent laryngeal nerve wraps around the

Answer 28

right subclavian artery

Question 29

The left recurrent laryngeal nerve wraps around the

Answer 29

arch of the aorta and the ligamentum arteriosum

Question 30

What artery supplies the SA and AV node up to 80% of the time?

Answer 30

right coronary artery

Question 31

most common site of coronary artery occlusion

Answer 31

Left anterior descending artery

Question 32

How many lobes does the R and L lungs have?

Answer 32

R 3 lobes superior, middle, inferior | L 2 lobes superior, inferior

Question 33

What is the lymphatic drainage of the R and L side of the body?

Answer 33

R lymphatic duct drains R arm and r side of the head left drains the rest of the body (remember diagram)

Question 34

What is the first major branch of the abdominal aorta?

Answer 34

Celiac trunk

Question 35

Branches of the celiac trunk

Answer 35

Left gastric Common hepatic Splenic

Question 36

The SMA supplies the

Answer 36

Duodenum to 2/3 of transverse colon

Question 37

The IMA supplies the

Answer 37

distal 1/3 of the transverse colon to upper rectum

Question 38

Diaphragmatic perforations

Answer 38

Mnemonic: I 8 10 Eggs at 12 T8 IVC T10 esophagus and vagus at 10 T12 Aorta/azygous and thoracic duct

Question 39

Retroperitoneal structures

Answer 39

``` 2nd 3rd and 4th parts of the duodenum Descending colon Ascending colon Pancreas body and head IVC Aorta Kidneys and ureters ```

Question 40

Boundaries of Hasselbech's triangle

Answer 40

Rectus abdominis, inferior epigastruc vessels, inguinal ligament

Question 41

Contents of the inguinal canal in males and females

Answer 41

Males- spermatic cord and ilioinguinal nerve Females- round ligament of the uterus and ilioinguinal nerve

Question 42

Boundaries of Hasselbech's triangle

Answer 42

Rectus abdominis, inferior epigastruc vessels, inguinal ligament

Question 43

Contents of the inguinal canal in males and females

Answer 43

Males- spermatic cord and ilioinguinal nerve Females- round ligament of the uterus and ilioinguinal nerve