Block 1: Practice Exam #3 Flashcards
Inability to flex the interphalangeal joint of the thumb is likely due to injury of which of the following nerves?
A. anterior interosseous
B. median
C. posterior interosseous
D. radial
E. ulnar
anterior interosseous
The nerve supply for the muscle that inserts on to the superior facet of the greater tuberosity of the humerus is:
A. axillary nerve
B. long thoracic nerve
C. lower subscapular nerve
D. musculocutaneous nerve
E. suprascapular nerve
suprascapular nerve
Which of the following is true of the musculocutaneous nerve?
A. it is formed by the roots of the lateral and medial cords
B. it is a continuation of the medial cord
C. it pierces the coracobrachialis muscle
D. it originates distal to the median nerve
E. it is the major motor nerve to the anterior compartment of the forearm
it pierces the coracobrachialis muscle
Which of the following conditions would most likely result in diminished axillary nerve function?
A. a tumor in the triangular space
B. fracture of the anatomic neck of the humerus
C. inferior dislocation of the glenohumeral joint
D. injury to the lateral cord of the brachial plexus
E. knife wound to the biceps muscle
inferior dislocation of the glenohumeral joint
Which of the following muscle - origin relationship(s) is/are correct?
A. coracobrachialis - coracoid process
B. long head of biceps brachii - supraglenoid tubercle
C. long head triceps brachii - infraglenoid tubercle
D. short head of biceps brachii - coracoid process
E. all of the above are correct
all of the above are correct
The conoid tubercle is a feature of which bone?
A. clavicle
B. humerus
C. manubrium of sternum
D. scapula
E. ulna
clavicle
Motor nerves typically enter their target muscles on the muscle’s deep side. Which of the following muscles is an example of the motor nerve entering the muscle on the superficial side?
A. latissimus dorsi
B. pectoralis minor
C. rhomboid major
D. serratus anterior
E. trapezius
serratus anterior
The anatomical neck of the humerus serves as the attachment site for which of the following structures?
A. coracoacromial ligament
B. glenohumeral joint capsule
C. glenoid labrum
D. supraspinatus tendon
E. none of the above attach to the anatomical neck
glenohumeral joint capsule
An injury to which cord of the brachial plexus would most likely cause loss of function of the latissimus dorsi and teres major muscles?
A. medial cord, proximal to the medial brachial cutaneous nerve
B. lateral cord, proximal to the contribution to the median nerve
C. medial cord, distal to the medial pectoral nerve
D. posterior cord, distal to the lower subscapular nerve
E. posterior cord, proximal to the upper subscapular nerve
posterior cord, proximal to the upper subscapular nerve
The medial cord of the brachial plexus contains fibers from which of the following division(s) of the brachial plexus?
A. anterior division of the inferior trunk only
B. anterior division of the middle and inferior trunks
C. anterior divisions of the superior and middle trunks
D. posterior divisions of the middle and inferior trunks
E. posterior division from the inferior trunk only
anterior division of the inferior trunk only
Which of the following does NOT have an attachment (origin or insertion) to the scapula?
A. pectoralis major
B. long head of biceps brachii
C. long head of triceps brachii
D. serratus anterior
E. teres major
pectoralis major
The latissimus dorsi muscle performs all of the following functions EXCEPT:
A. shoulder adduction
B. shoulder extension
C. shoulder external rotation
D. shoulder internal rotation
E. latissimus performs all of the above functions
shoulder external rotation
The nerve supply to the muscle that inserts into the lesser tubercle of the humerus is:
A. axillary nerve
B. lateral pectoral nerve
C. long thoracic nerve
D. thoracodorsal nerve
E. upper and lower subscapular nerves
upper and lower subscapular nerves
Injury to the lateral cord of the brachial plexus would result in substantial impairment of which of the following motions?
A. abduction of the arm at the shoulder
B. extension of the forearm at the elbow
C. extension of the wrist
D. flexion of the forearm at the elbow
E. abduction of the fingers
flexion of the forearm at the elbow
Nerves originating (in whole or part) from the posterior cord of the brachial plexus include all of the following EXCEPT:
A. axillary nerve
B. median nerve
C. radial nerve
D. thoracodorsal nerve
E. upper subscapular nerve
median nerve
The deltoid muscle performs all of the following actions EXCEPT:
A. abduction of the upper extremity
B. adduction of the upper extremity
C. extension of the arm at the glenohumeral joint
D. flexion of the arm at the glenohumeral joint
E. medial (internal) rotation of the arm at the glenohumeral joint
adduction of the upper extremity
All of the following are true of the pectoralis major muscle EXCEPT:
A. it is an important lateral (external) rotator of the humerus
B. its clavicular origin receives innervation from the lateral pectoral nerve
C. it receives blood from pectoral branches of the thoracoacromial trunk
D. it contributes to the anterior wall of the axilla
E. its sternal origin receives motor innervation from fibers which originated in the medial cord of the brachial plexus
it is an important lateral (external) rotator of the humerus
If the axillary artery was ligated (tied or blocked off) just distal to where the lateral thoracic artery normally comes off, which of the following muscles would NOT receive its primary blood supply?
A. levator scapulae
B. pectoralis major
C. pectoralis minor
D. teres major
E. trapezius
teres major
Injury to the medial cord of the brachial plexus would affect all of the following muscles EXCEPT:
A. adductor pollicis
B. deltoid
C. flexor carpi radialis
D. flexor carpi ulnaris
E. pectoralis major
deltoid
All of the following are true of the serratus anterior muscle EXCEPT:
A. it acts to protract the scapula and hold it against the thoracic wall
B. it attaches to the subscapular fossa
C. it is innervated by the long thoracic nerve
D. loss of its nerve supply results in “winged scapula”
E. the lateral thoracic artery is its primary blood supply
it attaches to the subscapular fossa
Of the muscles of the upper extremity which have attachment (origin or insertion) to the scapula, the one which is NOT innervated by a branch of the brachial plexus is the:
A. levator scapulae
B. serratus anterior
C. supraspinatus
D. teres major
E. trapezius
trapezius
Injury to the proximal portion of the superior trunk of the brachial plexus is obvious when the patient shows which of the following on physical exam?
A. inability to laterally (externally) rotate the arm
B. loss of sensation in the dorsum of the hand
C. paralyses of intrinsic muscles of the hand
D. paresthesia in the medial aspect of the arm
E. winged scapula
inability to laterally (externally) rotate the arm
The nerve supply for the muscle that inserts into the entire medial (vertebral) border of the scapula (anterior surface) is:
A. axillary nerve
B. dorsal scapular nerve
C. long thoracic nerve
D. suprascapular nerve
E. thoracodorsal nerve
long thoracic nerve
The primary restraint to anterior translation of the humeral head when the glenohumeral joint is abducted to 45 degrees is which of the following?
A. anterior band of the inferior glenohumeral ligament
B. axillary recess
C. middle glenohumeral ligament
D. posterior band of inferior glenohumeral ligament
E. superior glenohumeral ligament
middle glenohumeral ligament
A man was stabbed in the triangular space during a knife fight sustaining arterial damage. Which of the following arteries anastamoses with the damaged artery to supply blood to the scapular region?
A. dorsal scapular artery
B. profunda brachii artery
C. muscular branch of the axillary artery
D. anterior humeral circumflex artery
E. brachial artery
dorsal scapular artery
A man was stabbed in the triangular space during a knife fight sustaining arterial damage. Which of the following arteries anastamoses with the damaged artery to supply blood to the scapular region?
A. dorsal scapular artery
B. profunda brachii artery
C. muscular branch of the axillary artery
D. anterior humeral circumflex artery
E. brachial artery
dorsal scapular artery
Which tendon would most likely be affected if a patient has a narrow subacromial space?
A. infraspinatus
B. supraspinatus
C. teres major
D. teres minor
E. trapezius
supraspinatus
Which of the following structures is/are commonly found in the triangular hiatus (interval)?
A. axillary nerve
B. circumflex scapular artery
C. posterior circumflex humeral artery
D. profunda brachii artery
E. both A &C
profunda brachii artery
Fracture of the mid-shaft of the humerus leading to nerve damage may result in which of the following pathological conditions?
A. inability to abduct the glenohumeral joint
B. inability to extend the wrist
C. inability to flex the elbow
D. inability to flex the wrist
E. inability to flex the fingers
inability to extend the wrist
All of the following are true of the profunda (deep) brachial artery EXCEPT:
A. It runs with the ulnar nerve in the arm
B. its branches anastomose at the elbow with branches of the radial artery
C. is the first major branch of the brachial artery
D. it may be located between the long and lateral heads of triceps brachii
E. it provides major blood supply for the posterior compartment of the arm
It runs with the ulnar nerve in the arm