Which of the following laryngeal muscle arise from the 4th arch?

The neck is formed by the elongation of the region between the stomatodeum and the pericardium. This is achieved, paly, by a "descent" of the developing hea. However, this elongation is due mainly to the appearance of a series of mesodermal thickenings in the wall of the cranial-most pa of the foregut, i.e. future pharynx. These mesodermal thickenings are called the pharyngeal, or branchial, arches. Fouh arch - Larynx -Cricothyroid * Muscles of pharynx * Intrinsic muscles of soft palate except tensor palati. Ref: Inderbir Singh's Human Embryology, eleventh edition, pg. no.,127, Table Ref: Inderbir Singh's Human Embryology, eleventh edition, pg. no., 130 (Table 9.2).