Meckel S Cartilage

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Meckel Cartilage

Figure 15.8 A. Lateral view of the head and neck region of a 4-week embryo demonstrating the cartilages of the pharyngeal arches participating in formation of the bones of the face and neck. B. Various components of the pharyngeal arches later in development. Some of the components ossify; others disappear or become ligamentous. The maxillary process and Meckel's cartilage are replaced by the maxilla and mandible, respectively, which develop by membranous ossification.

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Figure 15.8 A. Lateral view of the head and neck region of a 4-week embryo demonstrating the cartilages of the pharyngeal arches participating in formation of the bones of the face and neck. B. Various components of the pharyngeal arches later in development. Some of the components ossify; others disappear or become ligamentous. The maxillary process and Meckel's cartilage are replaced by the maxilla and mandible, respectively, which develop by membranous ossification.

Development Maxillary
ous pharyngeal arches.

of the larynx (Fig. 15.9). Muscles of the fourth arch (cricothyroid, levator palatini, and constrictors of the pharynx) are innervated by the superior laryngeal branch of the vagus, the nerve of the fourth arch. Intrinsic muscles of the larynx are supplied by the recurrent laryngeal branch of the vagus, the nerve of the sixth arch.

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