Why is it called omohyoid muscle?
The omohyoid muscle originates from the top of the scapula, which is the official name for the shoulder blade. From the top of the scapula, this muscle then extends up the neck and attaches to the bottom part of the hyoid bone. This muscle gets its name from the words omos and hyoid.
What is omohyoid muscle syndrome?
Omohyoid muscle syndrome is a rare condition that presents as a characteristic X-shaped lateral protruding neck mass that occurs on swallowing (Figure 2b). This dynamic bulging neck mass is usually painless and is caused by the omohyoid muscle displacing the overlying SCM.
What does omohyoid muscle feel like?
The omohyoid muscle was exquisitely tender with a trigger point and a boggy, swollen feeling. With the exception of limited cervical extension, ROM was actively and passively normal but accompanied by mid-range and end-range pain.
What is the motor supply to the omohyoid?
All infrahyoid muscles, including the omohyoid, are supplied by the ansa cervicalis which arises from the cervical plexus. The superior belly of omohyoid muscle is innervated by the superior root of ansa cervicalis (C1), while the inferior belly receives fibers from spinal nerves C1, C2 and C3.
What is the function of Omohyoid muscle?
The primary function of the omohyoid muscle is to depress and fix the hyoid bone and underlying larynx though it also draws the hyoid bone downwards in phonation and in the terminal phase of swallowing.
What are the Infrahyoid muscles?
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 does the omohyoid muscle do?
Action. The omohyoid muscle primarily depresses and fixes the hyoid bone and underlying larynx. The omohyoid muscle has also been thought to depress the larynx and hyoid bone in phonation and in the terminal phase of swallowing.
What is the Sternothyroid muscle?
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.
Where is the Omohyoid muscle?
neck
The omohyoid 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. The omohyoid is a paired, flat strap of muscle that is made up of superior and inferior bellies joined by an intermediate tendon.
What are considered infrahyoid muscles?
The infrahyoid muscles or strap muscles are a group of four paired muscles in the anterior neck below the hyoid bone, within the muscular triangle. They are responsible for depressing the hyoid during swallowing. These muscles can be remembered by the mnemonic “TOSS”.
What is the main function of 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.
Which is a Suprahyoid muscle?
The suprahyoid muscles are those above or superior to the hyoid bones of the neck. They elevate the hyoid bone when the mandible is fixed in place, and lower the mandible when the hyoid is held firm by muscles beneath it.
What is the action of the omohyoid muscle?
This attachment changes the direction of the muscle moving the superior belly distal toward the hyoid bone, where the superior belly inserts. The action of omohyoid is to depress the hyoid bone.
Where is the omohyoid located in the neck?
Kim Bengochea, Regis University, Denver Omohyoid is a paired muscle located in the anterior region of the neck. It belongs to a group of muscles called infrahyoid muscles, along with three others: sternohyoid, sternothyroid and thyrohyoid .
Where is the inferior belly of the omohyoid muscle located?
The narrow flat omohyoid muscle consists of two bellies, an inferior and a superior belly, joined by an intermediate tendon; similar to the digastric muscle. Each of these muscle bellies has their own unique origin points. The inferior belly of omohyoid muscle originates from the superior border of the scapula, medial to the suprascapular notch.
How is the omohyoid muscle attached to the clavicle?
Omohyoid Muscle. The central tendon of omohyoid (i.e., the tendon between the inferior and superior bellies) is attached to the clavicle by a fibrous expansion of the cervical fascia. This attachment changes the direction of the muscle moving the superior belly distal toward the hyoid bone, where the superior belly inserts.