Anatomy for the USMLE: Exam Questions and Preparation
How Anatomy is tested on the USMLE, the high-yield topics, a preparation approach and original practice questions with explained answers.
Anatomy on the USMLE is tested clinically. Expect to localize an injury, identify a structure on an image, or connect an embryologic origin to a congenital defect. Gross anatomy, neuroanatomy and embryology all appear, and recall of names alone rarely earns the point.
Step 1 is reported as pass/fail, and its questions are integrated across disciplines and organ systems, so the subject labels below are study aids, not separate exams. The practice questions here are original and written to show the style of reasoning the exam rewards; they are not real exam items. Confirm the current content outline on the official USMLE website.
How Anatomy is tested
Questions usually describe a patient with a deficit and ask which nerve, vessel or structure is involved. Radiology, cross-sections and surgical scenarios are common, and many neuroanatomy questions ask you to localize a lesion.
High-yield topics
- Brachial plexus, lower limb nerves, dermatomes and myotomes
- Blood supply of the heart, gut and brain, and common sites of occlusion
- Inguinal canal, hernias and abdominal wall layers
- Spinal cord tracts, brainstem syndromes and cranial nerves
- Pharyngeal arches and pouches, neural crest derivatives and common congenital malformations
- Nerve and vessel injuries at classic fracture sites and during surgery
Preparation approach
- Learn each structure by what is lost when it is damaged, and rehearse the deficit pattern aloud.
- Study from diagrams and real imaging, then test yourself by naming structures on unlabeled images.
- Treat neuroanatomy as a localization puzzle: work from the signs to the level of the lesion.
- Keep embryology as short tables of derivative and associated defect, reviewed in spaced intervals.
Practice questions
Question 1
A man has weakness of foot dorsiflexion and eversion and loss of sensation over the dorsum of the foot after a fracture of the fibular neck. Which nerve is injured?
- A. Tibial nerve
- B. Common fibular (peroneal) nerve
- C. Femoral nerve
- D. Sural nerve
- E. Obturator nerve
Answer: B. The common fibular nerve wraps around the fibular neck. Injury causes foot drop and sensory loss over the dorsum of the foot.
Question 2
A man has hoarseness, difficulty swallowing, ataxia and a right Horner syndrome, with loss of pain and temperature sensation over the right face and the left body. Occlusion of which artery is most likely?
- A. Posterior inferior cerebellar artery
- B. Anterior inferior cerebellar artery
- C. Anterior spinal artery
- D. Posterior cerebral artery
- E. Basilar artery at the pons
Answer: A. This is the lateral medullary (Wallenberg) syndrome. It is classically caused by occlusion of the posterior inferior cerebellar artery or the vertebral artery.
Question 3
A newborn has hypocalcemia, absent thymic shadow, cardiac outflow tract defects and abnormal facies. Which structures failed to develop normally?
- A. First and second pharyngeal pouches
- B. Second pharyngeal pouch
- C. Third and fourth pharyngeal pouches
- D. First pharyngeal arch
- E. Fifth and sixth pharyngeal arches
Answer: C. The third pouch gives rise to the thymus and inferior parathyroids and the fourth to the superior parathyroids. Failure of these structures to develop causes 22q11.2 deletion (DiGeorge) syndrome.
Make it a plan
Put these subjects inside a dedicated study block with timed question blocks and careful review. See our Step 1 preparation timeline for a schedule and weekly milestones. This article is general educational guidance and not an individualized study plan.
Educational content only. Confirm current exam requirements with USMLE.