Brachial plexus bundle injury: Brachial plexus bundle injury is mostly seen in conveyor belt strangulation injuries, tire explosion impact injuries, direct impact on the shoulder and so on. Since the injury site is under the clavicle, the clinical manifestation is that the patient’s shoulder abduction function still exists partially or is normal, and the function below the shoulder is completely or mostly lost. However, on examination, the pectoralis major muscle function is normal, and the latissimus dorsi muscle strength may also be normal. This is the most obvious difference from a trunk or radicular nerve injury. Brachial plexus bundle injuries are divided into: lateral bundle, medial bundle and posterior bundle injuries. Lateral bundle injury: the main nerve branches of the lateral bundle are the musculocutaneous nerve and the lateral head of the median nerve, the main manifestations of the injury are biceps brachii muscle and brachialis muscle paralysis; paralysis of the anterior rotator anterior circular muscle and radial wrist flexor muscle, which will make the forearm rotator anteriorly and the power of wrist flexion weakened. For simple lateral bundle injury, because the elbow flexion function can be compensated by the brachioradialis muscle, the patient can still complete the elbow flexion movement, but the clinical examination will find that the biceps muscle atrophy, muscle strength grade 0. In addition, clinical examination showed hypesthesia of the thumb, digit, and middle finger, and grade 0 muscle strength of the radial wrist flexor. Medial bundle injury: the main branches of the medial bundle are the medial head of the median nerve and the ulnar nerve; after the injury of the medial bundle, the main manifestations are: hand dysfunction, such as: palsy of deep superficial flexor muscles of the finger to cause dysfunction of flexion of the finger, palsy of interosseous muscle to cause dysfunction of thumb abduction, palmar and finger; palsy of interosseous muscle to cause dysfunction of hand adduction and abduction. The intrinsic hand muscles and forearm flexors are obviously atrophied, showing “spade hand” deformity, and the shoulder and elbow joints have normal activities. Posterior fascicular injury: the branches of posterior fascicle are axillary nerve, radial nerve, thoracic and dorsal nerve and upper and lower branches of subscapularis nerve. After the injury of posterior lateral fascicle, the deltoid muscle, large and small circular muscle, triceps brachialis muscle, wrist extensor, extensor digitorum, extensor carpi radialis brevis muscle, extensor digitorum brevis muscle and latissimus dorsi muscle will lose the nerve innervation. The main clinical manifestations are: shoulder abduction function but limited (shoulder abduction function from the suprascapular nerve, but deltoid muscle strength grade 0), elbow extension, wrist extension, finger extension, thumb extension dysfunction, dorsal forearm and dorsal radial sensory deficits. Summary: Single bundle injuries are rare and can be seen in sharp force injuries. Through the observation of a large number of clinical cases, it was found that most of the bundle injuries were three bundle injuries at the same time. Clinical manifestations are elbow flexion dysfunction, complete loss of hand function, but elbow extension function is often partially residual. In addition, due to the mild injury of ulnar nerve in some patients, the little finger, ring finger and middle finger still have partial residual flexion function, and the hand is in the shape of a gun. The muscle strength of pectoralis major and latissimus dorsi is often normal. If the clinical examination found that the latissimus dorsi muscle strength grade 0, deltoid muscle strength grade 0, suggesting that the plane of injury of the posterior lateral fasciculus is higher, the injury is mostly located in the confluence of the three posterior femurs.