© Copyright 2026 American Medical Association. All rights reserved.
The cervical plexus is a network of nerves formed by the anterior rami of the C1 to C4 spinal nerve roots. This plexus is situated anterior to the cervical spine and posterior to the sternocleidomastoid muscle, which is a prominent muscle in the neck. In the context of a cervical plexus block, the procedure involves the careful identification and marking of the posterior border of the sternocleidomastoid muscle, as well as the planned injection site(s). The procedure can be performed as a superficial cervical plexus block, where a single injection is typically administered at the midpoint of the sternocleidomastoid muscle, or as a deep cervical plexus block, which may require multiple injections between the C2 and C6 vertebrae. During the procedure, the clinician inserts a needle and performs aspiration to confirm that the needle is not positioned within a blood vessel or, in the case of a deep block, to ensure that it has not entered the subarachnoid space. Once proper placement is confirmed, the anesthetic agent is injected. If multiple injections are necessary, this process is repeated until the desired level of anesthesia or analgesia is achieved, providing effective pain management for various surgical or diagnostic procedures involving the neck and upper shoulder regions.
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