What is the functional difference between suprahyoid muscles and infrahyoid muscles?
13.11). Both groups of muscles are involved with depression of the mandible and subsequent opening of the mouth, movement of the tongue, swallowing, and speaking. The infrahyoid muscles stabilize the hyoid bone so that the suprahyoid muscles have a firm base to assist with depression of the mandible.
Which are the infrahyoid muscles?
The four infrahyoid muscles are the sternohyoid, sternothyroid, thyrohyoid and omohyoid muscles. Excluding the sternothyroid, the infrahyoid muscles either originate from or insert on to the hyoid bone.
What is the main function of the infrahyoid muscles?
Infrahyoid muscles: Together, the infrahyoid muscles play an active role in swallowing through the movement of the larynx. The omohyoid, sternohyoid, and thyrohyoid act to depress the hyoid bone. The thyrohyoid elevates the larynx whereas the sternothyroid depress the larynx.
What is the combined action of the Suprahyoid and infrahyoid muscles?
The suprahyoid muscles do not only form the floor of the mouth but play an important role in chewing, swallowing and speech. In combination with the infrahyoid muscles, they are responsible for the positioning of the hyoid bone.
How are the Suprahyoid muscles grouped in relationship to the hyoid bone?
Anatomical terms of muscle The suprahyoid muscles are four muscles located above the hyoid bone in the neck. They are the digastric, stylohyoid, geniohyoid, and mylohyoid muscles. They are all pharyngeal muscles, with the exception of the geniohyoid muscle.
What is Sternothyroid muscle?
The sternothyroid muscle is an infrahyoid muscle of the neck that is innervated by the ansa cervicalis of the cervical plexus receiving fibers from the ventral rami of C1-C3 spinal nerves.
Why is infrahyoid muscles called strap muscles?
The name “strap muscles” comes from their long and flat shape, similar to a belt or strap 3.
What Innervates Suprahyoid?
The suprahyoid muscles are four muscles located above the hyoid bone in the neck….Function.
| Muscle | Geniohyoid |
|---|---|
| Origin | Inferior mental spine of Symphysis menti |
| Insertion | Hyoid |
| Innervation | Cervical Spinal Nerve 1 via the hypoglossal nerve (CN XII) |
Which Suprahyoid and infrahyoid muscles are innervated by cervical nerves as opposed to cranial nerves?
Note that the thyrohyoid muscle, which is also an infrahyoid muscle and the geniohyoid muscle which is a suprahyoid muscle are innervated by cervical spinal nerve 1 via the hypoglossal nerve.
Which infrahyoid muscle attaches to the scapula and the hyoid?
Omohyoid
Temporomandibular Disorders
| Muscle | Inferior Attachment | Superior Attachment |
|---|---|---|
| Omohyoid | Superior border of the scapula, near scapular notch | Hyoid bone |
| Sternohyoid | Manubrium of the sternum and the medial clavicle | Hyoid bone |
| Sternothyroid | Manubrium of the sternum | Thyroid cartilage |
| Thyrohyoid | Thyroid cartilage | Hyoid bone |
Which muscles produce biting and chewing movements of the mandible?
The muscles of mastication are involved in biting and chewing. The large masseter and temporalis are powerful elevators of the mandible (Figure 3), assisted by the pterygoid medialis.
How are the Suprahyoid and infrahyoid muscles named?
Infrahyoid muscles are below hyoid, while Suprahyoid muscles are labeled above. The suprahyoid muscles are four muscles located above the hyoid bone in the neck….Function.
| Muscle | Digastric (posterior belly) |
|---|---|
| Origin | Mastoid notch |
| Insertion | Intermediate Tendon |
| Innervation | Facial nerve (CN VII) |