All of the following infrahyoid muscles receive motor fibres from the ansa cervicalis EXCEPT:

• A Sternohyoid
• B Sternothyroid
• C Omohyoid
• D Thyrohyoid ✓

Explanation

Thyrohyoid is supplied by fibres from the D1 root that travel briefly with the hypoglossal nerve and leave it directly above the hyoid, bypassing the ansa. The superior root of the ansa itself is likewise composed of D1 fibres hitchhiking on the hypoglossal nerve. Sternohyoid, sternothyroid and both bellies of omohyoid receive branches from the superior and inferior roots of the loop, so they are true ansa targets.

Reference: Snell's Clinical Anatomy by Regions, 10th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.