T1 Nerve Root (T1)

Authors
Affiliations

Doctor of Physical Therapy

B.S. in Kinesiology

Doctor of Physical Therapy

B.A. in Neuroscience

Figure 1: Nerve roots extending from the spinal cord

Motor Innervation

Dermatome

Figure 2: Dermatomal cutaneous distribution
Figure 3: Dermatomal cutaneous distribution (Posterior)

Lesion

“Sensory disturbances occur on the medial arm. Paresis occurs variably in the following muscles: abductor pollicis brevis, opponens pollicis, flexor pollicis brevis, all lumbricals and interossei, abductor digiti minimi, opponens digiti minimi, flexor digiti minimi, and adductor pollicis [16]. The finger flexor reflex (C8 T1) may be depressed. Sympathetic fibers destined for the superior cervical ganglia are interrupted, resulting in an ipsilateral Horner syndrome.”

Examination

Muscle Strength

“Hand Intrinsics (T1) The patient is asked to squeeze the clinician’s fingers between their fingers while the clinician tries to pull their fingers away (Fig. 25-30). Based on the findings from the history, systems review, and key muscle testing, a sensory examination may be necessary (see Chapter 3).”

References

1.
Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/
2.
Brazis PW, Masdeu JC, Biller J. Localization in Clinical Neurology. 8th ed. Wolters Kluwer Health; 2022.
3.
Dutton M. Dutton’s Orthopaedic Examination, Evaluation, and Intervention. 5th ed. McGraw Hill Education; 2020.

Citation

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