Flexor Pollicis Brevis Muscle. Anatomical Study and Clinical Implications

Abstract

Introduction:This paper reports anatomical study of nature, incidence, innervation and clinical implications of Flexor Pollicis Brevis muscle (FPB).Material and Methods:The anatomical dissection of 60 limbs from 30 cadavers were performed in the Department of Anatomy of Medical School of Catholic University of São Paulo.Results:The superficial head of FPB has been innervated by the median nerve in 70% and in 30% it had double innervation. The deep head of FPB were absent in 14%, in 65%, occurred a double innervation. In 17.5% by deep branch of ulnar nerve and in 3.6% by recurrent branch of median nerve.Conclusion:The pattern of innervation more frequent in relationship to the flexor pollicis brevis muscle and should be considered as a normal pattern is that superficial head receives innervation of branches of median nerve and the deep head receives innervation of ulnar and median nerve.

Intramuscular Neural Distribution of Adductor Pollicis Muscle Spasticity in Cadaver Model Regarding Botulinum Neurotoxin Treatment

“…A compromised adductor pollicis can be tested using Froment’s sign, and its strength can be measured in neuromuscular monitoring by stimulating the ulnar nerve. 6 Wall, et al 7 presented a therapeutic option for the treatment of thumb-in-palm deformity in cerebral palsied children using BoNT of the adductor pollicis muscle. The study assessed the early results of a clinical trial in five hemiparetic cerebral palsy children using a prospective non-trialist-biased study design based on an independent panel assessment of pre- and post-intervention photographic and videotaped records of hand function and appearance, grip dynamometry, and goniometry.…”

High Median Nerve Paralysis: Is the Hand of Benediction or Preacher’s Hand A Correct Sign?

“… 17 , 18 The anatomical basis for these findings is the deep head innervation of the FPB by the ulnar nerve and‚ in one-third of the cases‚ dual innervation of the superficial head of the FPB. 19 In the classical hand of benediction for a median nerve injury, the thumb is also in abduction; however‚ because of the ulnar innervated adductor pollicis (Fig. 5 ), when making a fist the thumb is completely adducted and IP extension is evident (Fig.…”

Effect of muscle length in a handgrip task on corticomotor excitability of extrinsic and intrinsic hand muscles under resting and submaximal contraction conditions

“…Thus, it was expected that changes in wrist posture could modulate the corticospinal excitability of the FPB, mainly because FPB and FCR share the same innervation. Additional hypotheses regarding the shared innervation of FPB and FCR muscles and its potential contribution to their corticospinal modulation [29][30][31] can be found in the Appendix S3.…”