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Anatomy›Condition·Updated Jul 11, 2026·v1

Brachial Plexus

The brachial plexus (C5-T1) is a complex neural network supplying motor, sensory, and sympathetic innervation to the upper limb. Anatomical variants (prefixed 11%, postfixed 1%) are common and clinically relevant, altering dermatomal maps and interscalene block approaches. Injuries present with characteristic patterns: Erb-Duchenne palsy (C5-C6), Klumpke palsy (C8-T1), and whole plexus injury. Imaging with MRI neurography or CT myelography defines the injury level; Horner syndrome signals preganglionic avulsion requiring urgent surgical referral. Regional anesthesia techniques must account for fascial septa (costoclavicular block) and variant muscular anatomy (subclavius posticus, axillary arch). Management includes nerve transfers, physiotherapy for thoracic outlet syndrome, and dose-limited radiotherapy (≤60 Gy).

High Evidence176 references·7,236 words·29 min read·v1
brachial plexusErb palsyKlumpke palsythoracic outlet syndromenerve anatomyregional anesthesiaobstetric brachial plexus palsy

Quick Reference

RxDrug of choiceNot applicable; regional anesthesia: interscalene block for shoulder surgery, supraclavicular/axillary for more distal procedures
AltAlternativesPENG block (diaphragm-sparing), low-volume suprascapular block, infraclavicular continuous catheter
⊘AvoidInterscalene block in severe COPD or contralateral phrenic nerve palsy; screws >1.4 cm in medial clavicle
DxTest of choiceMRI neurography (3D STIR SPACE) or CT myelography to differentiate preganglionic vs postganglionic injury
ScKey scoreMRC scale for motor strength; Horner sign as indicator of preganglionic avulsion
→When to referHorner syndrome (urgent surgical referral), preganglionic avulsion, failed conservative therapy for thoracic outlet syndrome, birth palsy with no recovery by 3 months
Brachial plexus injury requires prompt localization to root, trunk, or cord level using history, exam, and imaging (MRI/CT myelography); anatomical variants (prefixed 11%, postfixed 1%) alter clinical and block approaches; Horner syndrome signals preganglionic avulsion mandating urgent surgical consultation.
The brachial plexus is a network of nerves formed by the ventral rami of C5-T1 that provides motor, sensory, and sympathetic innervation to the upper limb, shoulder, and upper chest. Its hierarchical organization into roots, trunks, divisions, cords, and terminal branches allows for predictable deficit patterns after injury. Anatomical variants (prefixed in 11%, postfixed in 1%) are common and alter clinical presentation and block strategies. Prompt recognition, accurate localization (root, trunk, cord), and appropriate imaging (MRI neurography or CT myelography) are essential for guiding management, especially when Horner syndrome signals preganglionic avulsion requiring urgent surgical referral.

Overview and Recommendations

Key Facts

  • •The brachial plexus is formed by the ventral rami of C5-T1 in 84% of individuals; a prefixed plexus (C4 contribution) occurs in 11% and a postfixed plexus (T2 contribution) in 1%, altering dermatomal maps, injury thresholds, and interscalene block landmarks.
  • •The plexus is organized hierarchically into roots, trunks, divisions, cords, and terminal branches; the regular arrangement of divisions into cords is the most stable element (96% prevalence), while root/trunk variations (16% atypical) are common enough to require careful imaging correlation.
  • •Motor innervation is distributed to all intrinsic and extrinsic upper limb muscles, and sensory coverage extends from the shoulder to the fingertips; the segmental organization produces predictable deficits: Erb-Duchenne palsy (C5-C6) and Klumpke palsy (C8-T1).
  • •Traumatic brachial plexus injury is a leading cause of upper limb disability, most often from high-energy traction in young males (e.g., motorcycle collisions); birth-related palsies affect thousands annually, with shoulder dystocia as the primary obstetric risk factor.
  • •The plexus traverses three confined spaces, the interscalene triangle, costoclavicular space, and retropectoralis minor space, each a site of potential entrapment in thoracic outlet syndrome; anatomical variants (e.g., subclavius posticus muscle in 4.9%) may contribute to neurogenic compression.
  • •The connective tissue architecture includes a "telescope" sliding system of epineurial laminae surrounding the musculocutaneous nerve that allows gliding during movement; disruption of this compliance is hypothesized to underlie idiopathic compression syndromes.

Clinical Significance

  • •Suspect brachial plexus injury in any patient with unilateral upper limb weakness, sensory loss, or pain after high-energy trauma (motorcycle crash, fall from height) or difficult delivery with shoulder dystocia; also consider in patients who have undergone prolonged prone positioning (e.g., during COVID-19).
  • •Ask about the mechanism: downward traction on an abducted arm (e.g., fall landing on shoulder) typically injures the upper trunk (C5-C6), while upward traction on an abducted arm (e.g., grasping to break a fall) stresses the lower trunk (C8-T1); arm elevation above the head during surgery can cause position-related plexopathy.
  • •Examine for Horner syndrome (ptosis, miosis, anhidrosis, enophthalmos), its presence indicates a preganglionic T1 root avulsion that will not recover spontaneously and mandates urgent surgical consultation for possible nerve transfer or grafting.
  • •Perform systematic motor testing: C5 - shoulder abduction (deltoid) and external rotation (infraspinatus); C6 - elbow flexion (biceps) and forearm supination; C7 - elbow extension (triceps) and wrist/finger extension; C8 - finger flexion (flexor digitorum profundus to digits 4-5); T1 - finger abduction/adduction (interossei) and thumb opposition; document strength using the MRC scale.
  • •Map sensory loss by dermatome: C5 - lateral shoulder and arm; C6 - lateral forearm and thumb/index finger; C7 - middle finger; C8 - medial forearm and ring/little fingers; T1 - medial arm; note that the medial antebrachial cutaneous nerve can help distinguish C8 from T1 involvement.
  • •Test for scapular winging (long thoracic nerve, C5-C7) and evaluate provocative maneuvers for thoracic outlet syndrome (Adson test, Roos test, Wright test), keep in mind that over 47% of individuals have the plexus piercing the anterior scalene, leading to false-negative vascular compression tests.
  • •Order MRI neurography (3D STIR SPACE) or CT myelography as the initial imaging study; CT myelography is superior for differentiating preganglionic avulsion (shown by pseudomeningoceles and absent root shadows) from postganglionic injury (neuroma, scar).
  • •In obstetric brachial plexus palsy, obtain 3D CT reconstruction to assess for scapular hypoplasia (average 14% reduction), acromial elongation (19%), and humeral head subluxation (14%), these correlate with functional impairment and surgical planning.
  • •For suspected neoplastic involvement (e.g., Pancoast tumor), MRI is best for evaluating tumor extension into the intervertebral foramen and brachial plexus, CT is optimal for bone erosion, and PET/CT detects unsuspected nodal and distant metastases.
  • •Differentiate from mimics: cervical radiculopathy (pain radiates with neck movement, dermatomal pattern may overlap but reflexes affected at same level), neuralgic amyotrophy (acute severe shoulder pain followed days later by weakness, often patchy), and distal mononeuropathies (median, ulnar, radial, more circumscribed deficits).
  • •Consider electrodiagnostic studies (EMG/NCS) at 3-4 weeks post-injury to confirm the level and severity of axon loss, differentiate preganglionic from postganglionic injury (sensory nerve action potentials are preserved in preganglionic lesions), and guide prognosis.
  • •When planning regional anesthesia, assess for variant anatomy: a prefixed plexus may lift the roots higher than expected, increasing phrenic nerve block risk; consider the pericapsular nerve group (PENG) block as a diaphragm-sparing alternative for shoulder surgery, as it has 0% phrenic nerve palsy compared to 24% with interscalene.

High-Yield Associations

  • •Upper trunk (C5-C6) injury → Erb-Duchenne palsy: produces a waiter's tip deformity (adducted, internally rotated shoulder; pronated forearm; flexed wrist) with loss of shoulder abduction, external rotation, and elbow flexion; most common birth-related palsy.
  • •Lower trunk (C8-T1) injury → Klumpke palsy: claw hand (intrinsic minus deformity), sensory loss over the medial forearm and hand; Horner syndrome if T1 is avulsed preganglionically; results from upward traction on the arm.
  • •Whole plexus injury → flail, anesthetic limb; absent reflexes; Horner syndrome often present; urgent surgical referral for possible nerve transfer or grafting to restore at least elbow flexion.
  • •Prefixed plexus (C4 contribution, 11%) → higher risk of upper trunk injury during delivery; the phrenic nerve (C3-C5) may be more cranial, altering the risk of hemidiaphragmatic paralysis during interscalene block; adjust block approach accordingly.
  • •Postfixed plexus (T2 contribution, 1%) → the lower trunk is more vulnerable to compression (e.g., from a cervical rib or fibrous band); deficits may mimic isolated C8-T1 pathology; dermatomal maps shift one level caudal.
  • •Thoracic outlet syndrome → compression occurs at the interscalene triangle (neurogenic TOS, most common, lower trunk affected), costoclavicular space (venous TOS, subclavian vein compression), or retropectoralis minor space (arterial TOS); first-line treatment is physiotherapy; surgery reserved for refractory cases with documented compression.
  • •Subclavius posticus muscle (prevalence 4.9%) → crosses the superior thoracic aperture and directly contacts the brachial plexus in 60% of cases on MRI; a potential cause of neurogenic TOS that may be missed on standard workup.
  • •Axillary arch of Langer → a musculofascial slip from latissimus dorsi that can compress the axillary vein or brachial plexus cords; innervated by the thoracodorsal nerve in 85% of cases; consider when axillary vein thrombosis or unexplained neurogenic symptoms occur.
  • •Dorsal scapular artery → when it arises from the subclavian artery (31% of cases), it passes between the upper and middle trunks in 63.2%, this relationship places the artery at risk during scalenotomy or supraclavicular exploration; inadvertent injury can cause significant bleeding that obscures the plexus.
  • •Costoclavicular block → a fascial septum separates the lateral cord from the medial and posterior cord compartments; the septum prevents anesthetic spread in 94.16% of cases unless pierced deliberately or two separate injections are made, always plan a dual-injection technique.
  • •PENG block for shoulder arthroscopy → provides comparable analgesia to interscalene block with 0% phrenic nerve palsy (vs 24%, P = 0.022) and less paresthesia (12% vs 36%, P = 0.047); preferred in patients with poor pulmonary reserve.
  • •Anterior suprascapular nerve block → reducing volume from 10 mL to 5 mL of 0.5% bupivacaine eliminates complete hemidiaphragmatic paralysis (0% vs 16.67%, P = 0.025) while maintaining effective analgesia for shoulder surgery.
  • •Radiation therapy → contour the brachial plexus as an avoidance structure during IMRT; limit maximum dose to ≤ 60 Gy to reduce the risk of radiation-induced plexopathy (diffuse T2 hyperintensity and thickening on MRI).
  • •Clavicle fracture fixation → avoid screws longer than 1.4 cm in the medial third of the clavicle; the neurovascular bundle lies between the medial fourth and three-fifths of the bone, and longer screws risk iatrogenic injury.
  • •Phrenic nerve palsy after interscalene block → occurs in up to 24% of patients; avoid this block in patients with severe COPD or contralateral phrenic nerve dysfunction; consider the PENG block or low-volume suprascapular block as alternatives.
  • •Oberlin transfer for C5-C6 injuries → transfer of ulnar nerve fascicles to the biceps branch of the musculocutaneous nerve restores elbow flexion; a triple transfer also reinnervates the brachioradialis via a lateral cutaneous nerve of forearm interposition graft (reinnervation distance ~94 mm, about 3 months).
  • •Preoperative depression (PHQ-9 ≥ 9) in patients undergoing partial ulnar nerve transfer is associated with significantly poorer motor recovery, screen for mood disorders and provide appropriate support before surgery.
  • •Reverse shoulder arthroplasty → lowering the humerus below the glenoid equator can stretch the axillary nerve; lateralization is safer; median nerve strain of up to 19.3% has been documented during the procedure, monitor for postoperative neurapraxia.
  • •Percutaneous tumor ablation near the brachial plexus → use hydrodissection, balloon interposition, or continuous electromyographic monitoring to reduce thermal injury risk; the plexus is vulnerable because of its fixed position and lack of protective fat in some areas.
  • •Post-radiation plexopathy vs tumor recurrence → radiation-induced changes show diffuse T2 hyperintensity and thickening without a mass; tumor recurrence typically presents with a focal enhancing mass; history of radiation dose and latency period (months to years) helps differentiate.

Board Review — High Yield

  • •Erb-Duchenne palsy, C5-C6 injury: waiter's tip deformity (adducted, internally rotated shoulder; pronated forearm; flexed wrist), loss of shoulder abduction, external rotation, and elbow flexion.
  • •Klumpke palsy, C8-T1 injury: claw hand (intrinsic minus), sensory loss over medial forearm and hand; Horner syndrome if T1 avulsed preganglionically.
  • •Prefixed plexus, C4 contribution in 11% of individuals; alters interscalene block landmarks and increases risk of upper trunk injury during delivery.
  • •Subclavius posticus muscle, prevalence 4.9%; crosses superior thoracic aperture, can compress brachial plexus causing neurogenic TOS; seen on coronal MRI.
  • •Dorsal scapular artery, when arising from subclavian artery (31%), passes between upper and middle trunks in 63.2%; at risk during scalenotomy.
  • •Costoclavicular fascial septum, separates lateral cord from medial/posterior cords; requires two separate injections for complete block in >94% of cases.
  • •PENG block, 0% phrenic nerve palsy vs 24% for interscalene; equivalent analgesia for shoulder arthroscopy but fewer side effects.
  • •Horner syndrome, ptosis, miosis, anhidrosis; indicates preganglionic T1 avulsion; urgent surgical referral for possible nerve transfer.
  • •Radiation dose limit, brachial plexus ≤60 Gy to avoid radiation-induced plexopathy (diffuse T2 hyperintensity on MRI).
  • •Clavicle screw length, >1.4 cm in medial third risks injury to neurovascular bundle lying between medial fourth and three-fifths of bone.

Deep Dive — Evidence Details

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