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Browse through thousands of multiple-choice question quizzes and expand your knowledge! MCQs are a great way to prepare for your incoming exams!
Anatomy - Upper Limb - Set 1
Injury to the radial nerve will present with which of the following symptoms?
Explanation
ExplanationInjury to the radial nerve results in an inability to extend the wrist which will cause the patient to present with a wrist drop.
Anatomy - Upper Limb - Set 1
A 32 year old Anatomist is tripped by a 1st term hacker while playing soccer and falls, fracturing the lateral epicondyle of his left humerus. Which one of the following would most likely be injured?
Explanation
ExplanationThe radial nerve passes around the lateral epicondyle of the humerus to enter the forearm, and would be at risk in this scenario.
Anatomy - Upper Limb - Set 1
A patient of yours complains of pain in their hand that started after the patient had fallen down on an outstretched hand. Upon ordering an X-ray you notice that the patient's scaphoid bone is fractured. Based on your anatomical knowledge of the affected region, which artery is most at risk of being injured with this kind of injury?
Explanation
ExplanationThe affected region in this case is the anatomical snuffbox. The scaphoid bone forms the floor of the anatomical snuffbox. The radial artery is the major vessel that travels through the anatomical snuffbox. None of the other vessels listed pass through this space.
Anatomy - Upper Limb - Set 1
The two opponens muscles of the hand receive their motor innervation from the:
Explanation
ExplanationThe two opponens muscles of the hand control the 1st and 5th digits. The opponens pollicis muscle for the thumb is among the thenar muscles, innervated by the recurrent branch of the median nerve. The opponens digiti minimi muscle, a member of the hypothenar group, is innervated by the ulnar nerve.
Anatomy - Upper Limb - Set 2
The primary muscle of the arm necessary to execute a push-up is the:
Explanation
ExplanationA push-up involves extension of the forearm, which is primarily performed by the triceps brachii muscle.
Anatomy - Upper Limb - Set 2
The tendons of the flexor digitorum superficialis muscle insert into the:
Explanation
ExplanationFDS inserts into the base of the proximal phalanges and mainly flexes the PIP joints. In contrast, flexor digitorum profundus tendons travel further to insert into the bases of the distal phalanges, allowing for PIP and DIP flexion.
Anatomy - Upper Limb - Set 2
Which artery usually gives rise to the second common palmar digital artery?
Explanation
ExplanationThe sUperficial palmar arch arises primarily from the Ulnar artery, travels more distally, and gives rise to the palmar digital arteries. The deep palmar arch arises primarily from the radial artery, does not travel as far distally, and gives rise to the palmar metacarpal arteries.
Anatomy - Upper Limb - Set 2
The second common palmar digital artery usually arises as a direct branch of the:
Explanation
ExplanationThe common palmar digital arteries arise as branches of the sUperficial palmar arch, which receives its major contribution from the Ulnar artery. This is in contrast to the palmar metacarpal arteries arising from the deep palmar arch, which receives its major contribution from the radial artery.
Anatomy - Upper Limb - Set 2
The superficial flexor muscles in the forearm primarily originate from the __________ of the humerus.
Explanation
ExplanationThe superficial muscles of the flexor compartment of the forearm generally originate from a common flexor tendon off the medial epicondyle of the humerus. In contrast, the extensors generally originate from the common extensor tendon off the lateral epicondyle of the humerus.
Anatomy - Upper Limb - Set 1
Most of the skin over the origin of the extensors of the hand and digits receives its sensory innervation from the _________ nerve, a continuation of the __________ nerve.
Explanation
ExplanationThe extensors of the hand and digits originate from the common extensor tendon at the lateral epicondyle of the humerus. The question is therefore referring to the skin overlying the lateral forearm, which receives cutaneous innervation from the lateral antebrachial cutaneous nerve, which is the continuation of the musculocutaneous nerve into the forearm.
Anatomy - Upper Limb - Set 1
The long thoracic nerve innervates which muscle?
Explanation
ExplanationThe serratus anterior is innervated by the long thoracic nerve and it receives blood from the lateral thoracic artery. This can be remembered as "loNg Nerve, lAteral Artery." Teres major is innervated by the lower subscapular nerve. Subscapularis is innervated by the subscapular nerve. The scalene muscles are innervated by cervical branches from C3-C6.
Anatomy - Upper Limb - Set 1
Which one of the following muscles is a "pure" flexor of the elbow; that is, it has no other function?
Explanation
ExplanationThe brachialis is a pure flexor of the elbow and has no other function. The Pronator teres is a pronator of the arm; brachioradialis acts to flex the elbow but can also help with supination/pronation depending on elbow position. The biceps brachii is a flexor of the elbow as well as a powerful supinator of the forearm. Finally, triceps brachii is an extensor of the elbow.
Anatomy - Upper Limb - Set 3
The artery of the posterior (extensor) compartment of the arm is the:
Explanation
Explanation
Anatomy - Upper Limb - Set 3
A patient has a torn rotator cuff. Which of the following muscle tendons will be intact and have normal function?
Explanation
ExplanationThe rotator cuff consists of the tendons of the supraspinatus, infraspinatus, subscapularis, and teres minor muscles. The teres major is the only muscle listed that is not part of the rotator cuff and would have normal function if the entire rotator cuff was damaged.
Anatomy - Upper Limb - Set 3
The most powerful supinator is the:
Explanation
ExplanationBiceps brachii is the most powerful supinator of the forearm. The other supinator is, of course, the Supinator muscle. Brachialis is purely a flexor of the forearm. Brachioradialis is a flexor of the semipronated forearm, and anconeus assists in elbow extension and stabilizes the elbow joint.
Anatomy - Upper Limb - Set 3
In the classical dermatome distribution, pain around the nail of the ring finger would be felt via the:
Explanation
ExplanationIn the classical distribution, the ulnar nerve innervates the medial 1.5 digits, and the median nerve innervates the lateral 3.5 digits. Therefore, the ring finger (4th digit) receives half from the ulnar nerve and half from the median nerve.
Anatomy - Upper Limb - Set 3
Due to its insertion into the ____________, the pectoralis minor muscle functions primarily in ______________.
Explanation
Explanation
Anatomy - Upper Limb - Set 3
The cutaneous innervation of the index finger is by the:
Explanation
ExplanationThe lateral 3.5 digits of the hand receive cutaneous innervation from the median nerve on the anterior surface, and from the radial nerve on the posterior surface approximately up to the DIP joints.
Anatomy - Upper Limb - Set 3
The sternoclavicular joint is a:
Explanation
Explanation
Anatomy - Upper Limb - Set 3
Both pronators and the supinator insert on the:
Explanation
ExplanationPronator teres has two heads; one originates from the medial epicondyle of humerus and another from the olecranon process of the ulna. Both heads insert on the [b]lateral surface of the radius[b]. Pronator quadratus originates from the medial surface of the ulna and inserts on the [b]lateral surface of the radius[b]. Supinator originates from the lateral epicondyle of the humerus and inserts on the [b]lateral surface of the radius[b].
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