Which of the following is not attached laterally to thyroid cartilage, or all the following muscles are attached to the oblique line of thyroid cartilage except:
Sternothyroid
Thyrohyoid
Superior constrictor
Inferior constrictor
Larynx is composed of nine cartilage out of which 3 are paired and 3 unpaired.
Paired - Arytenoids, corniculates and cuneiforms. Unpaired - Thyroid, cricoids, epiglottis.
Thyroid cartilage is the largest cartilage of larynx.
On the lateral surface of thyroid cartilage three extrinsic laryngeal muscle are connects to it as:

Sternohyoid
Thyrohyoid
Inferior pharyngeal constrictor.