UL MCQ Flashcards
- When pushing a heavy object forward with both arms, the most active muscles are the:
a) Latissimus dorsi
b) Lower fibres of the trapezius
c) Serratus anterior
d) Biceps brachii
e) Extensor digitorum
c) Serratus anterior
- In an injury to the upper roots of the brachial plexus, the resulting weakness will significantly affect:
a) Elevation of the scapula
b) Extension of the elbow
c) Adduction of the thumb
d) Abduction of the glenohumeral joint
e) Extension at the interphalangeal joints
d) Abduction of the glenohumeral joint
- Compression of the median nerve in the “carpal-tunnel syndrome”:
a) May cause complete numbness of the middle finger
b) Occurs at the lower end of the forearm
c) Makes it difficult to abduct the finger
d) Could weaken opposition
e) May result in claw hand
d) Could weaken opposition
- Supination of the forearm:
a) Involves the humeroulnar joint
b) Is facilitated by both the radial and musculocutaneous nerves
c) Requires the forearm to be extended
d) Is primarily caused by the supinator
e) Is impaired by injury to the lower roots of the brachial plexus
b) Is facilitated by both the radial and musculocutaneous nerves
- In a fall on the outstretched hand the bones most likely to be injured at the wrist are the:
a) Trapezium and trapezoid
b) Triquetrum and pisiform
c) Capitate and hamate
d) Scaphoid and radius
e) Ulna and lunate
d) Scaphoid and radius
- The radial pulse is best felt:
a) In the anatomical snuff box
b) Lateral to the flexor carpi radialis
c) Between the Palmaris longus and flexor carpi radialis
d) At the cubital fossa
e) Alongside the radial nerve
b) Lateral to the flexor carpi radialis
- It is possible to locate and identify the cephalic vein in the following places except:
a) Lateral end of the dorsal venous arch
b) Anatomical snuff box
c) Medial aspect of the arm
d) Deltopectoral groove
e) In front of the elbow
c) Medial aspect of the arm
- In an obstruction to the 2nd part of the axillary artery, collateral circulation (to bypass the obstruction) to the arm may be established between the:
a) First and third parts of the axillary artery
b) Lateral thoracic and subscapular arteries
c) Subclavian artery and branches of the third part of the axillary artery
d) Scapular anastomosis and the brachial artery
e) Subclavian artery and the brachial artery
c) Subclavian artery and branches of the third part of the axillary artery
In obstruction to 2nd part of axillary artery, collat circulation is estab by scapular anastomosis, providing alternative route of blood circulation b/w subclavian and 3rd part ofaxillary artery.
The scapular anastomosis is a network formed by a number of arteries supplying the scapula, not limited to and including:
(a) Dorsal scapular artery: a branch of the transverse cervical artery, originating from the thyrocervical trunk, which came from the first part of the subclavian artery.
(b) Suprascapular artery: also a branch of the thyrocervical trunk, originating from the first part of the subclavian artery
(c) Subscapular artery: a branch of the third part of the axillary artery which supplies the subscapularis in the subscapular fossa, inferiorly till the inferior angle.
(d) Some branches of the thoracic aorta
- A complete claw hand with numbness over the medial aspect of the arm is consistent with the injury of:
a) Ulnar nerve at the elbow joint
b) Radial nerve at the axilla
c) Both medial and ulnar nerves above the elbow joint
d) The lowest root of the brachial plexus
e) Complete destruction of the brachial plexus
d) The lowest root of the brachial plexus
- Injury to the lateral cord of brachial plexus is most likely to cause:
a) Weakness of abduction
b) Weakness of supination
c) Wrist drop
d) Numbness of little finger
e) Difficulty in doing push-ups
b) Weakness of supination
The lateral cord carries nerve fibres from spinal roots C5 through C7. The lateral cord gives off the musculocutaneous nerve before fusing with the medial cord to give the median nerve.
*note: supinator is not affected bc it is supplied by the radial nerve, a branch of the posterior cord.
- A cut over the lateral side of the wrist is least likely to injure:
a) Median nerve
b) Abductor pollicis longus
c) Extensor pollicis longus
d) Radial nerve
a) Median nerve
- Abduction of the arm to the vertical position is not caused by:
a) Levator scapulae
b) Trapezius
c) Deltoid
d) Supraspinatus
e) Serratus anterior
a) Levator scapulae
- Loss of sweating in the hand is most likely the result of damage to:
a) Dorsal root of upper thoracic spinal nerve
b) Sympathetic chain
c) Greater splanchnic nerve
d) Vagus nerve
b) Sympathetic chain
- Axillary lymph nodes are least likely to receive lymph from:
a) Side of the neck
b) Breast
c) Epigastrium
d) Scapula region
e) Hand
a) Side of the neck
- The components not significantly involved in generating the biceps tendon reflex is:
a) Muscle spindles in the biceps tendon
b) Musculocutaneous nerve
c) Selected dorsal root ganglia
d) Axons of selected motor neurons in the spinal cord
e) Sarcoplasmic reticulum in the biceps muscle fibres
a) Muscle spindles in the biceps tendon
In a typical tendon reflex, 1st step is inducing a short lengthening of the muscle by lightly tapping on the tendon. short lengthening of the muscle stimulates the muscle spindles in the BELLY of the muscle to send signals through the afferent sensory neurons, which have their cell bodies contained within the dorsal root ganglion. The signal is passed along the afferents into the dorsal horn of the spinal cord. Thereafter, the afferent sensory neurons then synapse with the efferent motor neurons, and the signal continues to travel along the axons of the motor neurons out through the ventral horn of the spinal cord. The signal eventually returns back to the muscle fibres via the relevant peripheral nerve (in the case of the biceps tendon reflex, the musculocutaneous nerve), triggering contraction of the muscle.
- Biceps tendon jerk is mediated by the following except:
a) Musculocutaneous nerve
b) Dorsal roots of C5, C6
c) Ventral horn cells of C5, C6
d) Medial cord
e) Sarcoplasmic reticulum in the muscle
d) Medial cord
the musculocutaneous nerve is a terminal branch of the LATERAL cord of the brachial plexus.
- Suprascapular nerve supplies the:
a) Subscapularis
b) Teres minor
c) Rhomboid minor
d) Infraspinatus
e) Latissimus dorsi
d) Infraspinatus
- In a supracondylar fracture, which of the following structures is most likely to be injured:
a) Radial nerve
b) Median nerve
c) Ulnar nerve
d) Circumflex artery
e) Axillary nerve
b) Median nerve
- Reposition of the thumb is accomplished by all the following except:
a) Abductor pollicis longus
b) Adductor pollicis
c) Extensor pollicis brevis
d) Extensor pollicis longus
b) Adductor pollicis
- In the upper extremity, a pulse may be palpated at all of the following locations except:
a) In the arm against the humerus just distal to the pectoralis minor
b) In the cubital fossa medial to the biceps brachii tendon
c) In the wrist at the radial side of the tendon of the flexor carpi radialis muscle
d) At the wrist at the radial side of the pisiform bone
e) In the hand between the tendons of the extensor pollicis brevis and abductor pollicis longus muscles
e) In the hand between the tendons of the extensor pollicis brevis and abductor pollicis longus muscles
- Which of the following statements describing the pectoralis minor muscle is correct:
a) It attaches to the acromion process of the scapula
b) It crosses anterior to the cords of the brachial plexus
c) It is an adductor and medial rotator of the humerus
d) It is innervated by the middle subscapular (thoracodorsal) nerve
e) It originates deep to the axillary artery
b) It crosses anterior to the cords of the brachial plexus
- Which of the following statements pertaining to the cephalic vein are correct:
a) It accompanies the brachial artery
b) It drains the ulnar side of the hand
c) It is suitable for venipuncture anterior to the medial epicondyle
d) It lies in the groove between the deltoid and pectoralis major muscles
d) It lies in the groove between the deltoid and pectoralis major muscles
- The ulnar nerve innervates which of the following muscles of the thumb:
a) Abductor pollicis brevis
b) Abductor pollicis longus
c) Deep head of the flexor pollicis brevis
d) Opponens pollicis
e) Superficial head of the flexor pollicis brevis
c) Deep head of the flexor pollicis brevis
take note!
- Following complete severance of the musculocutaneous nerve, some weak flexion of the elbow is possible through contraction of muscles not innervated by that nerve. All of the following muscles also flex the elbow except the:
a) Brachioradialis
b) Flexor carpi radialis
c) Flexor carpi ulnaris
d) Ulnar head of the pronator teres
d) Ulnar head of the pronator teres