ABEM Anatomy & Neurophysiology Flashcards
6 cards from real ABEM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 ABEM Anatomy & Neurophysiology flashcards as text
Which muscle is the primary abductor of the thumb and is commonly tested in thenar EMG?
Answer: Abductor pollicis brevis
The abductor pollicis brevis is the most superficial thenar muscle and is the primary target for median nerve EMG assessment.
The sural nerve is formed by contributions from which two nerves?
Answer: Tibial and common peroneal nerves
The sural nerve is formed by the medial sural cutaneous nerve (from tibial) and the peroneal communicating branch (from common peroneal nerve).
Which segment of the spinal cord is responsible for the Achilles tendon reflex?
Answer: S1-S2
The Achilles tendon reflex is mediated primarily by the S1 nerve root, with S2 contribution in some individuals.
The lateral femoral cutaneous nerve exits the pelvis near which anatomical landmark?
Answer: Inguinal ligament near ASIS
The lateral femoral cutaneous nerve passes under or through the inguinal ligament near the anterior superior iliac spine, where it can be compressed.
What is the functional consequence of demyelination on nerve conduction velocity?
Answer: Conduction velocity decreases
Demyelination disrupts saltatory conduction, forcing the action potential to travel continuously along the axon, markedly slowing conduction velocity.
Which nerve supplies sensation to the medial aspect of the forearm?
Answer: Medial cutaneous nerve of the forearm
The medial cutaneous nerve of the forearm (medial antebrachial cutaneous nerve) provides sensory innervation to the medial forearm.