Omohyoid muscle – Origin, Insertion, Innervation & Function – Human Anatomy | Kenhub

Omohyoid muscle – Origin, Insertion, Innervation & Function – Human Anatomy | Kenhub

Hey everyone! It’s Matt from Kenhub, and
in this tutorial, we will be discussing the omohyoid muscle. The infrahyoid muscles are
a group of four muscles under the hyoid bone attaching to the sternum, larynx, and scapula.
They are the sternothyroid, the thyrohyoid, the sternohyoid, and the omohyoid muscle – which
will be the focus of this video. The omohyoid muscle is divided into a superior
and inferior belly. The inferior belly begins at the superior border of the scapula, ascends
craniomedially and merges into an intermediate tendon at the height of the lateral cervical
region. This tendon is connected to the carotid sheath which surrounds the neurovascular bundle
which includes the common carotid artery, internal jugular vein and vagus nerve. Distally,
the muscle attaches to the body of hyoid bone. All four infrahyoid muscles are supplied by
the deep ansa cervicalis which arises from the cervical plexus. The infrahyoid muscles
are responsible for the positioning of the hyoid bone along the suprahyoid muscles. They
play an active role in swallowing and the movement of the larynx. More specifically,
the omohyoid assists the sternohyoid and the thyrohyoid in depressing the hyoid. The omohyoid has an additional function due
to its attachment to the carotid sheath. By pulling the sheath, it maintains a low pressure
in the internal jugular vein – this way, increasing the blood return from the head
to the superior vena cava. This video is more fun than reading a textbook,
right? If you want more videos, interactive quizzes, articles, and an atlas of human anatomy,
click on the “Take me to Kenhub” button. It is time to say goodbye to your old textbooks
and say hello to your new anatomy learning partner, Kenhub! See you there!

7 Replies to “Omohyoid muscle – Origin, Insertion, Innervation & Function – Human Anatomy | Kenhub”

  1. Great video! All of the infrahyoid muscles are innervated by the ansa cervicalis EXCEPT for the thyrohyoid, which is innervated by C1.

  2. Hey there! Hope you enjoyed this video on the omohyoid muscle! Let you know what you think in comments below! Remember if you'd like to know to more about the infrahyoid muscles, you can check out this videom which discusses them all in great detail! Enjoy!

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