Nerve Innervations

Question 1

The muscles of the anterior compartment of the arm are innervated by the?

Answer 1

musculocutanous nerve

Question 2

The muscles of the posterior compartment of the arm and forearm are innervated by the?

Answer 2

Radial Nerve

Question 3

All forearm flexors are innervated by the median nerve except one and a half muscle that are innervated by the?

Answer 3

ulnar nerve (flexor carpi ulnaris and the ulnar half of the flexor digitorum profundus).

Question 4

All intrinsic hand muscles are innervated by the ulnar nerve except?

Answer 4

three and a half muscles that are innervated by the median nerve (the three thenar muscles and the radial half of lumbricals).

Question 5

Flexor digitorum profundus is innervated by?

Answer 5

radial half (digits 2 & 3) by median nerve and ulnar half (digits 4 & 5) by ulnar nerve.

Question 6

Lumbricals of the hand are innervated by?

Answer 6

radial half (lumbrical 1 & 2) by median nerve and ulnar half (lumbrical 3 & 4) by ulnar nerve

Question 7

The pectoralis major is innervated by?

Answer 7

innervated by both lateral and medial pectoral nerves

Question 8

Flexor pollicis brevis is innervated by?

Answer 8

may be innervated by both the recurrent branch of the median nerve and ulnar nerve. (For test purposed in this course the flexor pollicis brevis is only innervated by the recurrent branch of the median nerve)

Question 9

The subscapularis is innervated by?

Answer 9

may be innervated by both upper and lower subscapular nerves (from post. cord of brachial plexus).

Question 10

Adductor Magnus is innervated by?

Answer 10

the adductor partion is innervated by obturator nerve and the hamstring part by the tibial division of sciatic nerve.

Question 11

Bicep femoris is innervated by?

Answer 11

long head by tibial division and short head by common fibular division of the sciatic nerve.

Question 12

There are two major superficial veins in the upper limb ?

Answer 12

Basilic and cephalic

Question 13

there are two major superficial veins in the lower limb?

Answer 13

Great saphenous and small saphenous

Question 14

Testing “L” (“Z”) movement by lumbricals can differentiate injuries?

Answer 14

Of the ulnar and medial nerve

Question 15

Testing “L” (“Z”) movement by lumbricals can differentiate injuries of?

Answer 15

Median and ulnar nerve

Question 16

Testing “DAB” or “PAD” are testing?

Answer 16

ulnar nerve function only

Question 17

Flexion of the thumb is testing?

Answer 17

flexor pollicis longus (median), flexor pollicis brevis (median)

Question 18

Extension of the thumb is testing?

Answer 18

extensor pollicis longus (radial), extensor pollicis brevis (radial)

Question 19

Abduction of the thumb is testing?

Answer 19

abductor pollicis longus (radial), abductor pollicis brevis (median)

Question 20

Adduction of the thumb is testing?

Answer 20

adductor pollicis (ulnar)

Question 21

Opposition of the thumb is testing?

Answer 21

opponens pollicis (median)

Question 22

The superior gluteal nerve innervates three muscles?

Answer 22

gluteus medius, gluteus minimus, and tensor fasca lata.

Question 23

The anterior compartment of the thigh (quadriceps femoris & sartotius m) is innervated by?

Answer 23

Femoral nerve

Question 24

The posterior compartment of the thigh (hamstring m.) is innervated by?

Answer 24

sciatic (tibial) nerve

Question 25

The medial compartment of the thigh (the adductors, gracilis & obturator externus m.) is innervated by?

Answer 25

Obturator nerve

Question 26

Pectineus is innervated by?

Answer 26

Obturator & Femoral nerve

Question 27

The posterior compartment of the leg is innervated and receives blood from?

Answer 27

Tibial nerve

Receives blood from the posterior tibial and fibular artery

Question 28

The anterior compartment of the leg is innervated and receives blood from?

Answer 28

deep fibular (peroneal) nerve (blood supply from the anterior tibia artery).

Question 29

The lateral compartment of the leg is innervated by and receives blood from?

Answer 29

superficial fibular (peroneal) nerve (blood supply from perforating arteries of the fibular artery).

Question 30

The terrible triad is a caused by a medial directed force (= valgus force) to the lateral side of the knee, as foot in planted on the ground causes what?

Answer 30

ruptures the media collateral ligament, medial meniscus and anterior cruciate ligaments

Question 31

Excess invertion (~85% of ankle sprains) of the foot/ankle causes strain of ?

Answer 31

the lateral collateral ligament of the ankle with the anterior talofibular ligament most frequently damaged

Question 32

Excess eversion of the foot/ankle causes strain for the?

Answer 32

medial (deltoid) collateral ligament of the ankle, but often evulsing the distal portion of the medial malleolus of the tibia rather than deltoid ligament failure.

Question 33

Throwing motions (e.g. pitching a baseball) cause excessive strain on the?

Answer 33

medial/ulnar collateral ligament of the elbow joint, most frequently straining the anterior bundle of this ligament (“Tommy John Surgery” is the repair of the ulnar collateral ligament).

Question 34

How do you test the Ulnar collateral ligament?

Answer 34

performed by palpating the ligament while applying a valgal force (forcing wrist laterally) to the elbow joint.

Question 35

Falling on an outstretched hand (FOOSH) can result in?

Answer 35

Colle’s Fracture (distal 1.5 cm of radius);

scaphoid fracture (typically neck of scaphoid with vascular necrosis of proximal fragment if union is not achieved);

clavicular (typically medial 1/3); surgical neck of humerus (mainly in elderly population).

Question 36

Surgical Neck fracture can lead to injury of what?

Answer 36

Axillary Nerve

Question 37

Mid-shaft fracture can lead to injury of what?

Answer 37

Radial nerve

Question 38

Distal-lateral fracture can lead to injury of what?

Answer 38

Median nerve

Question 39

Medial epicondyle fracture can lead to injury of what?

Answer 39

Ulnar nerve

Question 40

Lateral epicondyle fracture can lead to injury of what?

Answer 40

Radial nerve