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.
How many infrahyoid muscles are there?
The four infrahyoid muscles are the sternohyoid, omohyoid, sternothyroid, and thyrohyoid muscles.
Where are the infrahyoid muscles?
neck
The infrahyoid muscles are a group of four paired muscles that lie inferiorly to the hyoid bone in the anterior aspect of neck. This group of muscles is also known as strap muscles. They connect hyoid, sternum, clavicle and scapula. Infrahyoid muscles are organised in two layers.
What are the Supra and infrahyoid muscles?
The suprahyoid muscles include digastric, stylohyoid, mylohyoid and geniohyoid. The infrahyoid muscles include omohyoid, sternohyoid, sternothyroid and thyrohyoid. The hyoid muscles act to stabilise the trachea and play a vital part in swallowing and speech.
Is the thyrohyoid a infrahyoid muscle?
Anatomical terms of muscle The infrahyoid muscles, or strap muscles, are a group of four pairs of muscles in the anterior (frontal) part of the neck. The four infrahyoid muscles are the sternohyoid, sternothyroid, thyrohyoid and omohyoid muscles.
What does Sternohyoid muscle mean?
Medical Definition of sternohyoid : an infrahyoid muscle on each side of the midline that arises from the medial end of the clavicle and the first segment of the sternum, inserts into the body of the hyoid bone, and acts to depress the hyoid bone and the larynx.
What are the actions of the infrahyoid muscles?
Function. The infrahyoid muscles are responsible for the positioning of the hyoid bone along with the suprahyoid muscles. They play an active role in swallowing and the movement of the larynx. More specifically, all infrahyoid muscles (except the sternothyroid) depress the hyoid.
What Innervates the Infrahyoid muscle?
Nerve supply All of the infrahyoid muscles are innervated by the ansa cervicalis from the cervical plexus (C1-C3) except the thyrohyoid muscle, which is innervated by fibers only from the first cervical spinal nerve travelling with the hypoglossal nerve.
What is the anterior belly of digastric?
The anterior belly of the digastric is one of the three suprahyoid muscles which stabilizes the hyoid during swallowing, an action critical in protecting the airway while eating. Furthermore, the digastrics work to depress the mandible for jaw opening, chewing, and speech.
What is the Hyoglossus muscle?
The hyoglossus muscle is a thin, quadrilaterally shaped muscle in the upper neck and the floor of the mouth. It is one of the extrinsic muscles of the tongue. The submandibular ganglion suspended from the lingual nerve sits on it.
Which nerve Innervates 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).
