Chinese Journal Of Clinical Anatomy ›› 2017, Vol. 35 ›› Issue (5): 486-489.doi: 10.13418/j.issn.1001-165x.2017.05.002

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Localization and clinical significance of the nerve entry point of the teres major muscle

WANG Meng1, WANG Guo-ya2, YANG Sheng-bo1   

  1. 1. Department of Anatomy of Zunyi Medical College, Zunyi, Guizhou 563000, China; 2. Centre of Forensic Expertise of Xishui country, Zunyi, Guizhou 564600, China
  • Received:2017-06-21 Online:2017-09-25 Published:2017-10-30

Abstract:

Objective    This study aimed to localize the body location of nerve entry point (NEP) of the teres major muscle accurately. Methods Twelve Chinese adult cadavers in the supine position were used. The lineclose to the skin that connecting the most inferior point of the jugular notch to the apex of the acromion was the horizontal reference H line and the line from the most inferior point of the jugular notch to the junction of sterna body and xiphoid process were designated as the L line longitudinal reference line L. Those cadavers were dissected to expose the NEPs of teres major muscle for marking the NEPs by barium sulfate. CT scanning and three-dimensional reconstruction were performed. The body surface projection points (P) of the NEPs were determined under Syngo system, P projected to the back skin was designated as P' point by NEP. The intersections between the vertical P and the H line, and between the horizontal P and L line were designated as PH and PL, respectively. The percentage location of PH and PL points on H line and L line and the percentage depth of NEPs were measured respectively.    Results    The points PH and PL of the NEP of teres major muscle were located at (9.59±1.24)% of the H line and (39.37±2.45)% of the L line, respectively. The percentage depth of NEP was located at (41.83±2.98)%.   Conclusion    These parameters can provide guidance for improving the efficiency and efficacy of the treatment of teres major muscle spasticity with shoulder pain after hemiplegia.

Key words: Teres major muscle,  Spasticity,  Nerve entry point,  Localization,  Spiral computed tomography