13 Anatomy for Needle Electromyography Upper Extremity Median Nerve Abductor Pollicis Brevis (APB) (Figure 13–1A,B) Innervation: FIGURE 13–1 A. Abductor pollicis brevis insertion point. B. Cross-section anatomy*. †Adapted from: Gray’s…
39 Basics of Electricity and Electronics for Electrodiagnostic Studies In the office, hospital, and home, we are surrounded by equipment, appliances, and many other devices powered by electricity. Although knowledge…
10 Routine Upper Extremity, Facial, and Phrenic Nerve Conduction Techniques Median Motor Study (Figure 10–1) Recording Site: Abductor pollicis brevis (APB) muscle (lateral thenar eminence): G1 placed over the muscle…
16 Clinical–Electrophysiologic Correlations Overview and Common Patterns The value of information gained from electrodiagnostic (EDX) studies relies on correct data collection and, even more importantly, correct data interpretation. Mastering the…
26 Polyneuropathy Nerve conduction studies and electromyography (EMG) play key roles in the evaluation of patients with suspected polyneuropathy. Although polyneuropathy has hundreds of potential causes, they can be grouped…
19 Ulnar Neuropathy at the Elbow Ulnar neuropathy at the elbow (UNE) is second only to median nerve entrapment at the wrist (i.e., carpal tunnel syndrome [CTS]) as the most…
14 Basic Electromyography Analysis of Spontaneous Activity The recognition of abnormal spontaneous activity is one of the most important parts of the needle electromyography (EMG) examination. The presence of abnormal…
17 Median Neuropathy at the Wrist Median nerve entrapment at the wrist is the most common of all entrapment neuropathies and, consequently, is one of the most frequent reasons for…
34 Neuromuscular Junction Disorders Disorders affecting the neuromuscular junction (NMJ) are among the most interesting and rewarding seen in the electromyography (EMG) laboratory. These disorders are generally pure motor syndromes…
32 Lumbosacral Plexopathy The anterior rami of the L1–S3 roots come together to form the lumbosacral plexus, from which all major lower extremity nerves are derived. Disorders of the lumbosacral…
