This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Sternohyoid is supplied by 
Select and explain. 
A. CI through hyoid glossal nerve, B. Ansa cervicalis, C. Glossopharyngeal nerve, D. Hypoglossal nerve
B: Ansa cervicalis
Answer: B: Ansa cervicalis 
Explanation: The ansa cervicalis or ansa hypoglossal is a thin nerve loop that lies embedded in the anterior wall of the carotid sheath over the lower pa of the larynx.It supplies the infrahyoid muscles. Distribution Superior root:To the superior belly of the omohyoid. Ansa cervicalis:To the sternohyoid,the sternothyroid and the inferior belly of the omohyoid. The throhyoid and geniohyoid are supplied by seperate branches from the first cervical nerve through the hypoglossal nerve. REF.BDC VOL.3,FIFTH EDITION