Axillary Nerve
Axillary Nerve - Related Videos
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This study describes a standardized surgical procedure for single-port endoscopic axillary lymph node dissection without liposuction in breast cancer. Indicated for patients with biopsy-confirmed nodal metastasis or positive sentinel lymph nodes, the technique emphasizes preservation of critical structures, particularly the intercostobrachial nerve, to reduce postoperative morbidity and optimize functional recovery.
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A New Hybrid Quantitative Evaluation Model for Axillary Junctional Hemorrhage in Swine
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This study presents a hybrid quantitative model for axillary junctional hemorrhage in swine, enhancing pre-hospital hemostatic intervention evaluation.
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Gasless Endoscopic Thyroidectomy via the Trans-Axillary Approach
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This protocol presents the procedure for conducting thyroidectomy using the gasless endoscopic thyroidectomy trans-axillary approach (GETTA).
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Toluidine Blue Staining of Peripheral Nerve Sections: A Technique to Stain Myelinated Nerve Fibers For Peripheral Nerve Structure Visualization
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2025
This video demonstrates the staining technique of resin-embedded, osmium tetroxide-treated rat peripheral nerve sections using toluidine blue. The stained nerve sections help visualize the fine structures of peripheral nerves.
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Vagus Nerve Stimulation via Chronically Implanted Peripheral Nerve Cuff Electrodes in Rats
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2025
Source: Sanchez, C. A., et al. Preparation of Peripheral Nerve Stimulation Electrodes for Chronic Implantation in Rats. J. Vis. Exp. (2020).This video demonstrates vagus nerve stimulation in an awake rat. A rat with an implanted chronic peripheral nerve cuff electrode and trained in a lever press task is connected to a stimulus generator via an implanted head cap. The vagus nerve is stimulated immediately after each successful lever press, resulting in the expansion of the motor map.
FAQs
The axillary nerve carries fibers mainly from spinal nerve roots C5 and C6 through the posterior cord of the brachial plexus. This organization links its activity to shoulder-region motor control and sensation. Because it contains both motor and sensory fibers, changes in its function can affect movement and skin sensation rather than producing only one type of deficit.
The quadrangular space is a clinically important passage because the axillary nerve travels through it near the surgical neck of the humerus. Its close relationship to this region helps explain why trauma or procedures involving the shoulder and upper humerus may compromise nerve function. Injury at this point can affect both downstream motor branches and the sensory branch.
Motor branches of the axillary nerve supply the deltoid and teres minor muscles, giving the nerve two distinct muscular targets in the shoulder. The deltoid is especially relevant to arm abduction, while involvement of the teres minor adds information about axillary motor function. Weakness affecting these muscles can therefore help indicate dysfunction along the nerve’s pathway.
The axillary nerve includes a sensory branch that supplies skin over the upper lateral arm. Reduced sensation in this region provides a sensory clue that the nerve may be affected, particularly when it occurs alongside shoulder weakness. Considering the sensory distribution together with motor findings helps distinguish a broader axillary nerve problem from an isolated muscle disorder.
Clinicians can assess axillary nerve function by considering the performance of its shoulder muscles and sensation in its cutaneous territory. These findings connect a peripheral nerve examination with the posterior cord and its mainly C5–C6 fibers. The combined pattern can help evaluate brachial plexus function and identify whether shoulder deficits have a neural component.
Axillary nerve function deserves attention after shoulder injury or surgery because the nerve passes through the quadrangular space near the surgical neck of the humerus. Assessment is particularly relevant when a person develops impaired arm abduction, shoulder weakness, or numbness over the upper lateral arm. These outcomes can indicate compromise of the nerve or its branches.