ECS – Electrophysiologic Clinical Specialist (ABPTS)
ECS – ELECTROPHYSIOLOGIC CLINICAL SPECIALIST (ABPTS) | EXAM QUESTIONS
AND CORRECT ANSWERS | VERIFIED CLINICAL ELECTROPHYSIOLOGY PHYSICAL
THERAPY LATEST 2026/2027
ECS – Electrophysiologic Clinical Specialist (ABPTS)
1. Which spinal nerve roots primarily contribute to the median nerve?
A. C6-T1
B. C5-C6
C. L4-S1
D. C8-T1 only
A. C6-T1 — The median nerve arises mainly from the lateral and
medial cords, carrying fibers from C6 through T1.
2. The radial nerve is the terminal continuation of which brachial
plexus cord?
A. Posterior cord
B. Lateral cord
C. Medial cord
D. Upper trunk
A. Posterior cord — The posterior cord gives rise to the axillary and
radial nerves.
3. Which muscle is innervated by the anterior interosseous nerve, a
branch of the median nerve?
A. Flexor pollicis longus
B. Abductor pollicis brevis
C. Opponens pollicis
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, ECS – Electrophysiologic Clinical Specialist (ABPTS)
D. Flexor carpi ulnaris
A. Flexor pollicis longus — The AIN supplies flexor pollicis longus,
the lateral half of flexor digitorum profundus, and pronator
quadratus.
4. The common peroneal nerve divides into which two terminal
branches?
A. Sural and saphenous nerves
B. Superficial and deep peroneal nerves
C. Medial and lateral plantar nerves
D. Tibial and sural nerves
B. Superficial and deep peroneal nerves — The common peroneal
nerve splits near the fibular neck into superficial and deep peroneal
branches.
5. Which nerve supplies sensation to the first dorsal web space of the
foot?
A. Superficial peroneal nerve
B. Saphenous nerve
C. Deep peroneal nerve
D. Sural nerve
C. Deep peroneal nerve — The deep peroneal nerve's terminal
sensory branch supplies the first dorsal web space.
6. At the elbow, the ulnar nerve passes through which anatomic
structure?
A. Guyon's canal
B. Carpal tunnel
C. Cubital tunnel
D. Arcade of Frohse
C. Cubital tunnel — The ulnar nerve travels through the cubital
tunnel behind the medial epicondyle.
7. Which spinal nerve roots form the sciatic nerve?
A. T12-L3
B. L4-S3
C. S1-S4
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, ECS – Electrophysiologic Clinical Specialist (ABPTS)
D. L1-L4
B. L4-S3 — The sciatic nerve is formed from the L4 through S3 nerve
roots via the sacral plexus.
8. The tibial nerve primarily innervates which compartment of the leg?
A. Anterior compartment
B. Lateral compartment
C. Posterior compartment
D. None; it is purely sensory below the knee
C. Posterior compartment — The tibial nerve supplies the posterior
(gastrocnemius-soleus and deep flexor) muscles of the leg.
9. Fractures near the fibular neck most commonly injure which nerve?
A. Tibial nerve
B. Sural nerve
C. Saphenous nerve
D. Common peroneal nerve
D. Common peroneal nerve — The common peroneal nerve winds
superficially around the fibular neck, making it vulnerable there.
10. The axillary nerve, arising from the posterior cord, innervates
which muscles?
A. Supraspinatus and infraspinatus
B. Triceps and anconeus
C. Deltoid and teres minor
D. Biceps and brachialis
C. Deltoid and teres minor — The axillary nerve supplies the deltoid
and teres minor and gives sensation over the lateral shoulder.
Neuroscience Foundations
11. Upper motor neurons influence lower motor neurons primarily
through which descending pathway?
A. Corticospinal tract
B. Spinothalamic tract
C. Spinocerebellar tract
D. Dorsal column pathway
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, ECS – Electrophysiologic Clinical Specialist (ABPTS)
A. Corticospinal tract — The corticospinal tract is the principal
descending pathway carrying upper motor neuron output to the
anterior horn.
12. The cell bodies of lower motor neurons are located in which
structure?
A. Dorsal root ganglion
B. Dorsal horn of the spinal cord
C. Intermediolateral cell column
D. Anterior horn of the spinal cord
D. Anterior horn of the spinal cord — Lower motor neuron cell
bodies reside in the anterior (ventral) horn gray matter.
13. Where are the cell bodies of peripheral sensory nerve fibers
located?
A. Thalamus
B. Dorsal column nuclei
C. Anterior horn
D. Dorsal root ganglion
D. Dorsal root ganglion — Primary sensory neuron cell bodies sit in
the dorsal root ganglion, just outside the spinal cord.
14. Which spinal cord tract carries proprioception and vibration sense?
A. Corticospinal tract
B. Dorsal columns
C. Rubrospinal tract
D. Spinothalamic tract
B. Dorsal columns — The dorsal columns (fasciculus gracilis and
cuneatus) carry proprioception, vibration, and fine touch.
15. The spinothalamic tract primarily carries which sensory
modalities?
A. Two-point discrimination
B. Proprioception and vibration
C. Pain and temperature
D. Fine touch and pressure
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ECS – ELECTROPHYSIOLOGIC CLINICAL SPECIALIST (ABPTS) | EXAM QUESTIONS
AND CORRECT ANSWERS | VERIFIED CLINICAL ELECTROPHYSIOLOGY PHYSICAL
THERAPY LATEST 2026/2027
ECS – Electrophysiologic Clinical Specialist (ABPTS)
1. Which spinal nerve roots primarily contribute to the median nerve?
A. C6-T1
B. C5-C6
C. L4-S1
D. C8-T1 only
A. C6-T1 — The median nerve arises mainly from the lateral and
medial cords, carrying fibers from C6 through T1.
2. The radial nerve is the terminal continuation of which brachial
plexus cord?
A. Posterior cord
B. Lateral cord
C. Medial cord
D. Upper trunk
A. Posterior cord — The posterior cord gives rise to the axillary and
radial nerves.
3. Which muscle is innervated by the anterior interosseous nerve, a
branch of the median nerve?
A. Flexor pollicis longus
B. Abductor pollicis brevis
C. Opponens pollicis
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, ECS – Electrophysiologic Clinical Specialist (ABPTS)
D. Flexor carpi ulnaris
A. Flexor pollicis longus — The AIN supplies flexor pollicis longus,
the lateral half of flexor digitorum profundus, and pronator
quadratus.
4. The common peroneal nerve divides into which two terminal
branches?
A. Sural and saphenous nerves
B. Superficial and deep peroneal nerves
C. Medial and lateral plantar nerves
D. Tibial and sural nerves
B. Superficial and deep peroneal nerves — The common peroneal
nerve splits near the fibular neck into superficial and deep peroneal
branches.
5. Which nerve supplies sensation to the first dorsal web space of the
foot?
A. Superficial peroneal nerve
B. Saphenous nerve
C. Deep peroneal nerve
D. Sural nerve
C. Deep peroneal nerve — The deep peroneal nerve's terminal
sensory branch supplies the first dorsal web space.
6. At the elbow, the ulnar nerve passes through which anatomic
structure?
A. Guyon's canal
B. Carpal tunnel
C. Cubital tunnel
D. Arcade of Frohse
C. Cubital tunnel — The ulnar nerve travels through the cubital
tunnel behind the medial epicondyle.
7. Which spinal nerve roots form the sciatic nerve?
A. T12-L3
B. L4-S3
C. S1-S4
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, ECS – Electrophysiologic Clinical Specialist (ABPTS)
D. L1-L4
B. L4-S3 — The sciatic nerve is formed from the L4 through S3 nerve
roots via the sacral plexus.
8. The tibial nerve primarily innervates which compartment of the leg?
A. Anterior compartment
B. Lateral compartment
C. Posterior compartment
D. None; it is purely sensory below the knee
C. Posterior compartment — The tibial nerve supplies the posterior
(gastrocnemius-soleus and deep flexor) muscles of the leg.
9. Fractures near the fibular neck most commonly injure which nerve?
A. Tibial nerve
B. Sural nerve
C. Saphenous nerve
D. Common peroneal nerve
D. Common peroneal nerve — The common peroneal nerve winds
superficially around the fibular neck, making it vulnerable there.
10. The axillary nerve, arising from the posterior cord, innervates
which muscles?
A. Supraspinatus and infraspinatus
B. Triceps and anconeus
C. Deltoid and teres minor
D. Biceps and brachialis
C. Deltoid and teres minor — The axillary nerve supplies the deltoid
and teres minor and gives sensation over the lateral shoulder.
Neuroscience Foundations
11. Upper motor neurons influence lower motor neurons primarily
through which descending pathway?
A. Corticospinal tract
B. Spinothalamic tract
C. Spinocerebellar tract
D. Dorsal column pathway
Page 3 of 58
, ECS – Electrophysiologic Clinical Specialist (ABPTS)
A. Corticospinal tract — The corticospinal tract is the principal
descending pathway carrying upper motor neuron output to the
anterior horn.
12. The cell bodies of lower motor neurons are located in which
structure?
A. Dorsal root ganglion
B. Dorsal horn of the spinal cord
C. Intermediolateral cell column
D. Anterior horn of the spinal cord
D. Anterior horn of the spinal cord — Lower motor neuron cell
bodies reside in the anterior (ventral) horn gray matter.
13. Where are the cell bodies of peripheral sensory nerve fibers
located?
A. Thalamus
B. Dorsal column nuclei
C. Anterior horn
D. Dorsal root ganglion
D. Dorsal root ganglion — Primary sensory neuron cell bodies sit in
the dorsal root ganglion, just outside the spinal cord.
14. Which spinal cord tract carries proprioception and vibration sense?
A. Corticospinal tract
B. Dorsal columns
C. Rubrospinal tract
D. Spinothalamic tract
B. Dorsal columns — The dorsal columns (fasciculus gracilis and
cuneatus) carry proprioception, vibration, and fine touch.
15. The spinothalamic tract primarily carries which sensory
modalities?
A. Two-point discrimination
B. Proprioception and vibration
C. Pain and temperature
D. Fine touch and pressure
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