Nerves of pharyngeal cleft develop from
Neural tube - upper pa: Brain CNS neural plate lower pa: Spinal cord ectoderm Neural crest - ganglia of PNS ARCH. NERVE MUSCLES SKELETON I. Main: CNV (III)Additional: chorda Tympani: (CNVII) Muscles of mastication (temporal, masseter & the pterygoids) ant. Belly of digastric, tensor palatini, tensor tympani. Premaxilla, maxilla, zygomatic, Mandible, malleus, incus, anterior, ligament of malleus, sphenomandibular ligament, meckel's cailage. II. Main: CN VII Additional: tympanic branch of glossopharyngeal nerve (CN IX) Muscles of facial expression, posterior belly of digastric, stylohyoid, stapedius Stapes, styloid process, stylohyoid ligament, lesser horn & upper poion of body of hyoid bone. III. CN IX - glossopharyngeal Stylopharyngeus Greater horn & lower pa of hyoid bone V-VI CNX - vagusSuperior laryngeal n - 4th arch Recurrent laryngeal n - 6th arch Cricothyroid, levator palatine, constrictors od pharynx intrinsic muscles of larynx Laryngeal cailage (thyroid, cricoid, arytenoid, corniculate, uniform) Nerves of pharyngeal arches : each arch has a main nerve derived from the neural plate and an additional nerve derived from NCC. The additional nerves are the nerves of pharyngeal clefts. (Derived from NCC) Fig. Each pharyngeal arch is supplied by its own cranial nerve. The trigeminal nerve supplying the first pharyngeal arch has three branches: the ophthalmic, maxillary, and mandibular. The nerve of the second arch is the facial nerve; that of the third is the glossopharyngeal nerve. The musculature of the fouh arch is supplied by the superior laryngeal branch of the vagus nerve, and that of the sixth arch, by the recurrent branch of the vagus nerve.
Neuroectoderm
Neural crest cells
Ectoderm
Mesoderm
NEET 2018