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Pharyngeal Arch 1

BIO 290 Anatomy James Madison University

QuestionAnswer
What are the three bones of arch 1? Greater wing of sphenoid, incus, and malleus
What arch 1 structures are pouch derivatives? Auditory tube, middle ear cavity, tympanic membrane, and external acoustic meatus.
What would a rupture in the tympanic membrane cause? A connection of the pharynx to the external enviroment
What nerve innervates pharyngeal arch 1? Trigeminal (opthalmic, maxillary, mandibular)
The trigeminal nerve is a ____ root cranial nerve. Dorsal root
The opthalmic nerve provides (sensory/motor) innervation? Sensory
The maxillary nerve provides (sensory/motor) innervation? Sensory
The mandibular nerve provides (sensory/motor) innervation? Sensory and Motor
What hole does the opthalmic nerve pass through? Superior orbital fissure
What type of sensory innervation does the opthalmic nerve provide? General body sensory (body sensation)
What hole does the maxillary nerve run through? Foramen rotundum
What type of sensory innervation does the maxillary nerve provide? General body sensory and general gut tube sensory (nasal cavity, palate, and upper teeth)
What type of innervation does the mandibular nerve provide? General body sensory, general gut tube sensory (cheeks, lower teeth, floor of mouth, anterior 2/3 of tongue, and motor innervation to arch 1 muscles.
What is the only branch of the trigeminal nerve that provides motor innervation to arch 1 muscles? Mandibular
Are the arch 1 muscles derived from somites? No
Describe the types of muscles innervated by the mandibular nerve. Skeletal, voluntary muscles NOT derived from somites.
Arch 1 muscles receive ____ innervation from ___ root cranial nerves. Motor, Dorsal
What are the muscle groups in arch 1? Masticatory(4), Suprahyoid(2), Tensor tympani muscle
What is the origin, insertion, action, and innervation of the tensor tympani muscle? O- auditory tube I- Malleus A-Pulls malleus towards incus Inn- Mandibular nerve
What is the origin, insertion, action, and innervation of the anterior belly of the digastric muscle? o-Inferior margin of mandible near symphasis I- Hyoid bone via connective tissue loop A- Elevates and steadies hyoid Inn- Mandibular nerve
What is the origin, insertion, action, and innervation of the mylohyoid muscle? O- Medial surface of mandible from symphasis to molar teeth I- Hyoid bone and midline raphe A-Elevates floor of mouth and mandible Inn- Mandibular n
What is the origin, insertion, action, and innervation of the masseter muscle? O- Inferior border of zygomatic arch I- Lateral surface of mandible A-Elevates floor of mouth and hyoid Inn- Mandibular nerve
What is the origin, insertion, action, and innervation of the temporalis muscle? O- temporal bone I- Coronoid process of mandible A- Elevates mandible (and retrudes) Inn- Mandibular nerve
What is the origin, insertion, action, and innervation of the lateral pterygoid muscle? O- Greater wing of sphenoid, pterygoid process of sphenoid I- Mandibular condyles and temperomandibular joint A- Protrudes mandible, side to side movement Inn- Mandibular nerve
What is origin, insertion, action, and innervation of the medial pterygoid muscle? O-Maxilla, palatine, and pterygoid process of sphenoid I- Medial surface of mandible inferior to mandibular foramen A-Elevates mandible, side to side movement of mandible (Angle of mandible) Inn- Mandibular nerve
Name the muscles of arch 1. Tensor tympani, anterior belly of the digastric, mylohyoid, masseter, temporalis, lateral pterygoid, medial pterygoid
Created by: 757405106
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