Ultrasound anatomy

Ultrasound anatomy

The cervical plexus can be visualized as a collection of small oval hypoechoic (dark) nodules immediately deep or lateral to the posterior border of the sternocleidomastoid muscle (SCM), but this is not always apparent. Occasionally, the greater auricular nerve is visualized on the superficial surface of the SCM as a small, round, hypoechoic structure.

US view of the branches of the cervical plexus (yellow arrows) at the level of C4. GaN, Greater auricular nerve; SCM, Sternocleidomastoid muscle; LCa, Longus capitis muscle; LCo, Longus Colli muscle; MSM, Middle scalene muscle; LsCa, Longissimus capitis muscle; LS, Levator scapulae muscle; SPL, Splenius capitis muscle; SECM, Semispinalis capitis muscle.

US view of the branches of the cervical plexus (yellow arrows) at the level of C4. GaN, Greater auricular nerve; SCM, Sternocleidomastoid muscle; LCa, Longus capitis muscle; LCo, Longus Colli muscle; MSM, Middle scalene muscle; LsCa, Longissimus capitis muscle; LS, Levator scapulae muscle; SPL, Splenius capitis muscle; SECM, Semispinalis capitis muscle.