USMLE Step 1 Anatomy Practice Questions (High-Yield MCQs)
If you’re preparing for the USMLE Step 1, anatomy is one of the most high-yield and clinically integrated subjects tested on the exam. Anatomy questions are frequently combined with neurology, surgery, pathology, radiology, and emergency medicine, making them easy points if prepared correctly.
This page includes 30 high-yield USMLE Step 1 anatomy practice questions with detailed explanations, carefully designed to reflect real exam-style clinical vignettes. These questions are suitable for U.S. and Canadian medical students, as well as international medical graduates (IMGs) preparing for Step 1.
To simulate real test conditions, you can attempt these questions using the 30-minute timed mode below, similar to an actual USMLE exam block.
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30 High-Yield USMLE Step 1 Anatomy MCQs (With Explanations)
These questions cover upper limb, lower limb, neuroanatomy, embryology, vascular anatomy, and clinical correlations commonly tested on Step 1.
1. A surgical neck fracture of the humerus most commonly injures which nerve?
A) Radial
B) Ulnar
C) Axillary
D) Median
Answer: C) Axillary
Explanation: The axillary nerve wraps around the surgical neck of the humerus. Injury leads to deltoid paralysis and loss of shoulder abduction.
2. Compression of the median nerve in the carpal tunnel affects which muscle?
A) Interossei
B) Lumbricals 1 & 2
C) Adductor pollicis
D) Extensor digitorum
Answer: B) Lumbricals 1 & 2
Explanation: Median nerve supplies lateral lumbricals. Thenar atrophy is classic in carpal tunnel syndrome.
3. A lesion of the radial nerve in the radial groove causes:
A) Ape hand
B) Wrist drop
C) Claw hand
D) Loss of thumb opposition
Answer: B) Wrist drop
Explanation: Radial nerve controls wrist extensors. Injury leads to inability to extend the wrist.
4. The most common site of ectopic pregnancy is:
A) Fimbriae
B) Ampulla
C) Isthmus
D) Ovary
Answer: B) Ampulla
Explanation: The ampulla is the most frequent implantation site in ectopic pregnancies.
5. The artery most commonly involved in epidural hematoma is:
A) Middle cerebral
B) Anterior cerebral
C) Middle meningeal
D) Basilar
Answer: C) Middle meningeal
Explanation: Rupture from temporal bone fracture causes lens-shaped hematoma on CT.
6. Which structure passes through the foramen ovale?
A) CN II
B) CN V2
C) CN V3
D) CN VII
Answer: C) CN V3
Explanation: Mandibular division of trigeminal nerve passes through foramen ovale.
7. Injury to the recurrent laryngeal nerve causes:
A) Loss of pitch control
B) Hoarseness
C) Dysphagia
D) Loss of taste
Answer: B) Hoarseness
Explanation: Recurrent laryngeal nerve supplies intrinsic laryngeal muscles.
8. The ligamentum arteriosum is a remnant of:
A) Ductus venosus
B) Ductus arteriosus
C) Foramen ovale
D) Umbilical vein
Answer: B) Ductus arteriosus
9. A lesion at L4 affects which reflex?
A) Achilles
B) Patellar
C) Biceps
D) Triceps
Answer: B) Patellar
Explanation: Patellar reflex = L3–L4.
10. The thoracic duct drains into:
A) Right subclavian vein
B) Left subclavian vein
C) SVC
D) IVC
Answer: B) Left subclavian vein
11. The strongest ligament of the knee is:
A) ACL
B) PCL
C) MCL
D) LCL
Answer: B) PCL
12. Injury to CN III results in:
A) Dilated pupil
B) Constricted pupil
C) Facial paralysis
D) Hearing loss
Answer: A) Dilated pupil
13. The spleen develops from:
A) Endoderm
B) Mesoderm
C) Neural crest
D) Ectoderm
Answer: B) Mesoderm
14. The most common site of abdominal aortic aneurysm is:
A) Above renal arteries
B) Below renal arteries
C) Thoracic aorta
D) Aortic arch
Answer: B) Below renal arteries
15. Erb palsy involves injury to:
A) C5–C6
B) C8–T1
C) L4–L5
D) T1–T2
Answer: A) C5–C6
16. The structure most posterior in the renal hilum is:
A) Vein
B) Artery
C) Pelvis
D) Ureter
Answer: C) Pelvis
17. The appendix is supplied by:
A) SMA
B) IMA
C) Celiac trunk
D) Renal artery
Answer: A) SMA
18. The blood supply to the head of the pancreas comes from:
A) Celiac only
B) SMA only
C) Both celiac and SMA
D) IMA
Answer: C) Both celiac and SMA
19. The Achilles tendon inserts on:
A) Talus
B) Calcaneus
C) Navicular
D) Cuboid
Answer: B) Calcaneus
20. The most common hernia is:
A) Femoral
B) Direct inguinal
C) Indirect inguinal
D) Umbilical
Answer: C) Indirect inguinal
21. The superior orbital fissure transmits:
A) CN II
B) CN III, IV, V1, VI
C) CN VII
D) CN V3
Answer: B)
22. The main blood supply to the cerebellum comes from:
A) MCA
B) ACA
C) PICA
D) PCA
Answer: C) PICA
23. The femoral nerve originates from:
A) L2–L4
B) L4–S1
C) S1–S3
D) T12–L2
Answer: A)
24. The mitral valve is located between:
A) RA–RV
B) LA–LV
C) LV–Aorta
D) RV–Pulmonary artery
Answer: B)
25. The linea alba is formed by:
A) External oblique only
B) Internal oblique only
C) Fusion of aponeuroses
D) Transversus only
Answer: C)
26. A positive Trendelenburg sign indicates weakness of:
A) Gluteus maximus
B) Gluteus medius
C) Iliopsoas
D) Adductor longus
Answer: B)
27. The cauda equina ends at:
A) L1
B) L2
C) L4
D) S1
Answer: B)
28. The coronary artery most commonly occluded in MI:
A) RCA
B) LAD
C) Circumflex
D) PDA
Answer: B)
29. The pterion overlies which artery?
A) ACA
B) MCA
C) Middle meningeal
D) Basilar
Answer: C)
30. The structure compressed in cubital tunnel syndrome:
A) Median nerve
B) Ulnar nerve
C) Radial nerve
D) Axillary nerve
Answer: B)
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Frequently Asked Questions (USMLE Step 1 Anatomy)
Is anatomy heavily tested on USMLE Step 1?
Yes. Anatomy is commonly tested in integrated clinical scenarios, especially involving nerve injuries, vascular supply, imaging, and trauma-related questions.
What anatomy topics are most high-yield for Step 1?
High-yield topics include brachial plexus, cranial nerves, pelvic anatomy, hernias, cerebral blood supply, coronary circulation, and spinal cord lesions.
How should I study anatomy for USMLE Step 1?
Focus on clinical correlations, nerve lesions, blood supply, and radiologic anatomy. Practice questions with explanations are essential for long-term retention.
Are anatomy practice questions enough for Step 1?
Practice questions are critical, but they should be combined with active recall, spaced repetition, and diagram-based review for best results.