USMLE Step 1 questions with complete solutions (New Update 2023)

USMLE Step 1 questions with complete solutions (New Update 2023) What gland is found in the muscular triangle of the neck? - CORRECT ANSWER Thyroid gland Is an afferent or efferent pupillary defect described as B/L pupillary constriction when light is shined in the unaffected eye and B/L paradoxical dilation when light is shined in the affected eye? - CORRECT ANSWER Afferent pupillary defect (CN II lesion); in an efferent pupillary defect (CN III), B/L constrict when light is shined in the unaffected eye and consentual pupil constriction occurs when light is shined in the affected eye. What is the name of the spinal cord passing within the subarachnoid space and forming the spinal nerves that exit the lumbar and sacral foramina? - CORRECT ANSWER Cauda equina Name the laryngeal muscle described by the following: • Pulls the arytenoids cartilages closer to the thyroid, relaxing the vocal ligaments and thereby decreasing the pitch - CORRECT ANSWER Thyroarytenoid muscles Name the laryngeal muscle described by the following: • Tenses the vocal ligaments, increasing the distance between the cartilages, thereby increasing the pitch - CORRECT ANSWER Cricothyroid muscles Name the laryngeal muscle described by the following: • Adducts the vocal ligaments, closes the air passageway during swallowing, and allows phonation - CORRECT ANSWER Lateral cricoarytenoid muscles Name the laryngeal muscle described by the following: • Only muscle to abduct the vocal cords - CORRECT ANSWER Posterior cricoarytenoid muscles Where does the parotid (Stensen's) duct enter the oral cavity? - CORRECT ANSWER Opposite the second upper molar tooth From what aortic arch are the following structures derived? • Common and internal carotid arteries - CORRECT ANSWER Third aortic arch MS CARD is my mnemonic for the aortic arch derivatives From what aortic arch are the following structures derived? • Degenerates - CORRECT ANSWER Fifth MS CARD is my mnemonic for the aortic arch derivatives From what aortic arch are the following structures derived? • Stapes artery - CORRECT ANSWER Second MS CARD is my mnemonic for the aortic arch derivatives From what aortic arch are the following structures derived? • Maxillary artery - CORRECT ANSWER First MS CARD is my mnemonic for the aortic arch derivatives From what aortic arch are the following structures derived? • Arch of the aorta and right subclavian artery - CORRECT ANSWER Fourth MS CARD is my mnemonic for the aortic arch derivatives From what aortic arch are the following structures derived? • Right and left pulmonary arteries and the ductus arteriosus - CORRECT ANSWER Sixth MS CARD is my mnemonic for the aortic arch derivatives What abdominal muscle contributes to the anterior layer of the rectus sheath, forms the inguinal ligament, and in men gives rise to the external spermatic fascia of the spermatic cord? - CORRECT ANSWER External abdominal oblique Name the compartment of the lower extremity and the nerve based on its movements. • Adduct the thigh and flex the hip - CORRECT ANSWER Medial compartment of the thigh, obturator nerve