Contents
What does it mean to depress the hyoid bone?
infrahyoid muscles
The hyoid bone demarcates these muscles into a superior group and an inferior group. Contraction of the suprahyoid muscles will elevate the hyoid bone while contraction of the infrahyoid muscles will depress the hyoid bone. These muscles contract in the different phases of speaking, chewing, and swallowing.
What cranial nerve Innervates the Sternohyoid muscle?
Nerve supply The sternohyoid muscles are innervated by the anterior rami of C1 – C3 (predominantly C2 and C3) through the ansa cervicalis of the cervical plexus.
What muscles are superficial to sternohyoid?
There are four such muscles that are grouped into superficial and deep layers. The superficial layer includes sternohyoid and omohyoid, while the deep layer is made up of sternothyroid and thyrohyoid. The infrahyoid muscles are also part of a larger group called the extrinsic laryngeal muscles.
What muscle is lateral to the sternohyoid?
The sternohyoid muscle is a thin, narrow muscle attaching the hyoid bone to the sternum. It is one of the paired strap muscles of the infrahyoid muscles….
| Sternohyoid muscle | |
|---|---|
| Muscles of the neck. Lateral view. Sternohyoid muscle labeled | |
| Details | |
| Origin | manubrium of sternum |
| Insertion | hyoid bone |
What are the 4 infrahyoid muscles?
There are four strap muscles:
- thyrohyoid: deep and lateral.
- omohyoid: superficial and lateral.
- sternohyoid: superficial and medial.
- sternothyroid: deep and medial.
What muscle depresses the hyoid?
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 nerve Innervates Geniohyoid?
The hypoglossal nerve innervates the geniohyoid (GH) muscle, the intrinsic muscles of the tongue, and the extrinsic muscles of the tongue, i.e., the genioglossus muscle (medial branch), the styloglossus (SG), and hyoglossus (HG) muscles (lateral branch) (Fig.
What cranial nerve Innervates the Infrahyoid muscles?
The ansa cervicalis (or ansa hypoglossi) is the union of the C1, C2, and C3 nerves from the cervical plexus, which provides innervation to the infrahyoid muscles (Figure 31.2).
Does the sternohyoid elevate 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 function of sternothyroid muscles?
The sternothyroid is a paired, flat strap of muscle that serves to fix the hyoid bone as well as depressing the larynx in phonation and in the terminal phase of swallowing.
Are there two sternohyoid muscles?
The sternohyoid, sternothyroid, and sternocleidomastoid muscles originate at the manubrium. The sternohyoid muscle runs from the dorsal manubrium to the ventrocaudal hyoid bone, with attachments to the sternoclavicular joint capsule, and the sternothyroid muscle attaches along the dorsal midline of the manubrium.
What is the Sternocleidomastoid attach to?
The sternocleidomastoid (SCM) muscle is a major muscle of the neck. Classically, this muscle is attached below the sternum and clavicle, although the mode of attachment might vary.