What are all the branches of the medial cord of the brachial plexus?

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Ramas del Cordón Medial del Plexo Braquial

El cordón medial del plexo braquial se divide en dos ramas terminales principales: el nervio cubital (ulnar) y la raíz medial del nervio mediano, además de dar origen a varias ramas colaterales cutáneas.

Ramas Terminales del Cordón Medial

Nervio Cubital

  • El nervio cubital se origina del cordón medial, que deriva del tronco inferior formado por las raíces C8-T1 1
  • Proporciona sensibilidad al dedo meñique y la mitad medial del dedo anular 1
  • Las lesiones del tronco inferior (C8-T1) afectan principalmente al nervio cubital, causando déficits en la función intrínseca de la mano 1

Raíz Medial del Nervio Mediano

  • El cordón medial se divide para formar la raíz medial del nervio mediano 2
  • Esta raíz se une con la raíz lateral (proveniente del cordón lateral) para formar el nervio mediano completo 2
  • El nervio mediano resultante proporciona sensación cutánea a la superficie palmar del pulgar, índice, dedo medio y la mitad lateral del dedo anular 1

Ramas Colaterales del Cordón Medial

Nervio Cutáneo Medial del Brazo (Medial Brachial Cutaneous)

  • Se origina del cordón medial del plexo braquial 3
  • Inerva la piel sensorial en la superficie medial posterior del brazo superior 3
  • Este nervio está presente solo en algunos primates, incluyendo humanos, chimpancés y ciertos monos con alta movilidad articular del hombro 3

Nervio Cutáneo Medial del Antebrazo (Medial Antebrachial Cutaneous)

  • Surge de las raíces C8-T1 del plexo braquial a través del cordón medial 4
  • Es un nervio puramente sensorial sin función motora 4

Nervio Pectoral Medial

  • Se origina del cordón medial 5
  • Inerva los músculos pectorales

Consideraciones Anatómicas Importantes

Variaciones Anatómicas Frecuentes

  • Las variaciones del plexo braquial son comunes, con una prevalencia total de variación del 12.8% 6
  • El nervio cubital puede surgir por dos raíces del cordón medial en algunos casos 5
  • El nervio mediano puede formarse por 2 raíces laterales del cordón lateral y 1 raíz medial del cordón medial en aproximadamente 3.5% de los casos 7
  • Pueden existir comunicaciones intercordales entre los cordones lateral y medial 5

Organización Secuencial del Plexo

  • El plexo braquial se organiza secuencialmente en: raíces → troncos → divisiones → cordones → ramas terminales 2
  • Los cordones lateral, posterior y medial dan origen a las ramas terminales en el borde lateral del músculo pectoral menor y continúan a través de la axila 1
  • El plexo braquial típicamente se forma por las ramas ventrales de C5-T1, con contribuciones ocasionales de C4 y/o T2 8, 4

Implicaciones Clínicas

  • Diferenciar lesiones pregangliónares (raíz) de posgangliónares (plexo) es esencial porque las estrategias de tratamiento difieren 1
  • Los estudios electrodiagnósticos se utilizan para confirmar el diagnóstico clínico de lesión del plexo braquial 1
  • La RM del plexo braquial es el estándar de oro, demostrando una sensibilidad del 84% y especificidad del 91% para detectar avulsiones traumáticas de raíces 4

References

1
Guideline

Brachial Plexus Anatomy and Clinical Implications

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2026

2
Research

Brachial plexus anatomy.

Hand clinics, 2004

4
Guideline

Anatomy, Injury Mechanisms, and Diagnostic Imaging of the Medial and Lateral Antebrachial Cutaneous Nerves

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2026

8
Guideline

Guideline Directed Topic Overview

Dr.Oracle Medical Advisory Board & Editors, 2025

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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