Plexus brachialis

Plexus Brachialis is a network of nerves that originate from the spinal cord, specifically the anterior rami of the lower four cervical nerves (C5-C8) and the first thoracic nerve (T1). This complex network of nerves provides motor and sensory innervation to the upper limb, including the shoulder, arm, forearm, and hand.

Anatomy

The plexus brachialis is divided into roots, trunks, divisions, cords, and branches. The roots are the five anterior rami (C5-T1) that exit the spinal cord. These roots combine to form three trunks: the superior (C5-C6), middle (C7), and inferior (C8-T1). Each trunk then splits into an anterior and posterior division. The divisions regroup to form three cords: the lateral (from the anterior divisions of the superior and middle trunks), medial (from the anterior division of the inferior trunk), and posterior (from all three posterior divisions). The cords give rise to the five main branches of the plexus: the musculocutaneous nerve, median nerve, ulnar nerve, axillary nerve, and radial nerve.

Clinical Significance

Injury to the plexus brachialis can result in a variety of conditions, including Erb's Palsy and Klumpke's Palsy. These conditions are often caused by trauma during birth, but can also occur as a result of trauma in adults. Symptoms can include weakness or paralysis in the upper limb, loss of sensation, and pain.

See Also

• Nervous System
• Spinal Cord
• Upper Limb

References

---

Translate: - East Asian 中文, 日本, 한국어, South Asian हिन्दी, தமிழ், తెలుగు, Urdu, ಕನ್ನಡ, Southeast Asian Indonesian, Vietnamese, Thai, မြန်မာဘာသာ, বাংলা
European español, Deutsch, français, Greek, português do Brasil, polski, română, русский, Nederlands, norsk, svenska, suomi, Italian
Middle Eastern & African عربى, Turkish, Persian, Hebrew, Afrikaans, isiZulu, Kiswahili,
Other Bulgarian, Hungarian, Czech, Swedish, മലയാളം, मराठी, ਪੰਜਾਬੀ, ગુજરાતી, Portuguese, Ukrainian