Muscles and Innervations Flashcards
How many muscles of mastication are there?
4
List the four muscles of mastication.
Temporalis
Masseter
Lateral and Medial Pterygoid
What cranial nerve innervates the 4 muscles of mastication?
The trigeminal nerve (V)
Which facial muscles are important for swallowing efficiency?
Buccinator (cheek muscles),
Orbicularis oris (labio-seal for pressure)
Upper Lip:
Levator labii superiorous (above the lips), zygomaticus major and minor (elevation of upper lip),
Lower Lip:
depressor labii inferiorous (below the lips for depressing the lower lip), depressor anguli oris
What cranial nerve innervates the facial muscles?
The Facial Nerve (VII)
What are the two most important muscles of the palate?
The tensor veli palatini and levator veli palatini
What are the five palatal muscles discussed in class?
Tensor Veli Palatini
Levator Veli Palatini
Palatopharyngeus
Musculus uvulae
Palatoglossus (Often grouped with tongue muscles)
What are the four suprahyoid muscles?
Geniohyoid
Stylohyoid
Digastric
Mylohyoid
What are the suprahyoid muscles responsible for?
Elevating the hyoid and moving it anteriorly to protect the airway as the epiglottis closes. (Also depression of the mandible.)
Are the trigeminal and facial nerves motor, sensory, or both?
Both!
What is the purpose of the palatal muslces?
Involved in velopharyngeal closure
What is the innervation of the palatal muscles?
Tensor veli palatini - Trigeminal (V)
Levator Veli Palatini
Palatopharyngeus
Musculus uvulae
- Innervated by Pharyngoplexus: a combination of 3 nerves:
IX (Glossopharyngeal), X (Vagus), and some fibers from XI (Acessory Nerve)
What is the only palatal muscle innervted by the trigeminal nerve?
Tensor veli Palatini
What is the purpose of the muscles of the palate?
Velopharyngeal closure to ensure proper transit of the bolus.
What is the tongue used for in swallowing?
Creation of the bolus in oral prep and oral transit.
How many tongue muscles are there?
4
List the tongue muscles (4)
Palatoglossus
Hyoglossus
Genioglossus
Styloglossus
Which cranial nerves innervate the tongue muscles?
Pharyngeal Plexus innervates the Palatoglossus
Hypoglossal Nerve innervates:
Hyoglossus
Genioglossus
Styloglossus
What are the muscles of the hyoid elevation?
Geniohyoid
Mylohyoid
Digastric
Stylohyoid
How many muscles are there for hyoid elevation?
4
In Dr. B’s opinion, which muscle of hyoid elevation is the most imporant and why?
The Geniohyoid, because it is the only muslce that is invovled in both the superior and anterior movement of the hyoid bone.
What is the innervation for the muscles of hyoid elevation?
Geniohyoid - Cervical Nerve
Mylohyoid & Digastric - Trigeminal Nerve (X)
Stylohyoid - Facial Nerve (VII)
What is another name of the muscles of hyoid elevation? What does this mean?
Extrinsic muscles of the larynx, meaning that either the origin or insertion of the muscles must be within the laryngeal structure and either the origin or insertion must be outside the laryngeal structure.