Aefore Quiz

Question 1

Which of the following characteristics is NOT a feature of an ideal intramuscular injection site?

Safe distance from major bones and jointsOverlying a joint capsuleFew major nerves and blood vessels nearbyMinimal overlying subcutaneous fatThick, well-developed muscle mass

Question 2

During the nationwide COVID-19 vaccination campaign in Nigeria, a nurse administered the Moderna vaccine into the middle of the deltoid muscle, approximately 2–3 fingerbreadths below the acromion process. Why is this site preferred?

It contains the thickest portion of the deltoid while avoiding the axillary nerve, posterior circumflex humeral artery, and shoulder joint capsule.It lies directly over the shoulder joint, facilitating rapid vaccine absorption.It is closest to the radial nerve, allowing rapid systemic distribution.It minimizes pain because the area contains no sensory nerves.It avoids all major blood vessels by being immediately beneath the acromion.

Question 3

Which of the following statements regarding intramuscular injections into the deltoid muscle is INCORRECT?

The deltoid is suitable for small-volume injections, usually not exceeding 1–2 mL in adults.The muscle becomes thinner distally, increasing the risk of injecting into fascia rather than muscle.Injecting too high increases the risk of injury to the axillary nerve, posterior circumflex humeral artery, and shoulder joint capsule.The safest injection site is immediately inferior to the acromion process because the muscle is thickest there.Proper landmark identification minimizes neurovascular complications.

Question 4

Which nerve is most at risk if an intramuscular injection is administered too high in the deltoid muscle?

Question 5

Which of the following deficits may result from injury to the axillary nerve?

Wasting of the deltoid muscleWeakness of shoulder abduction, especially between 15° and 90°Loss of sensation over the "regimental badge" area of the lateral shoulderAll of the aboveNone of the above

Question 6

Which artery is most vulnerable during an improperly placed intramuscular injection into the superior part of the deltoid muscle?

Question 7

Which of the following muscles is NOT commonly used for intramuscular injections?

Question 8

Which of the following muscles does NOT derive its name primarily from its shape?

Question 9

A 32-year-old woman develops severe shoulder pain and inability to abduct her arm after receiving an intramuscular vaccine that was administered too high in the deltoid muscle. Which anatomical structure was most likely injured?

Radial nerve in the spiral groovePosterior circumflex humeral artery and axillary nerve within the quadrangular spaceMusculocutaneous nerve in the anterior compartment of the armLong thoracic nerve on the serratus anteriorThoracodorsal nerve in the posterior axillary wall

Question 10

An inexperienced healthcare worker administers an intramuscular injection immediately inferior to the acromion process instead of 2–3 fingerbreadths below it. Which complication is most likely?

Adhesive capsulitis due to injury of the shoulder joint capsuleFemoral nerve palsySciatic nerve injuryInjury to the profunda brachii arteryMedian nerve compression at the cubital fossa

Introduction to the Anatomy of Muscles