The omohyoid muscle is most developed in the horse and is absent in carnivores. It originates form the subscapular fascia, close to the shoulder joint in the horse and form the deep fascia of the neck in ruminants adn inserts on the bsihyoid bone. In the horse, the omohyoid mudcle unites with the corresponding muscle of the opposite side midway up the neck and inserts together with the sternohyoid muscle on the lingual process of the hyoid bone. In the cranial half of the neck, it is positioned betwwen the external jugular vein and the common carotid artery, thus providing some protection for he latter during intravenous injection.
Origin: subscapular fascia (pigs and horses), fascia lateral to middle cervical vertebrae (ruminants)
Insertion: Basihyoid bone.
Action: retracts hyoid bone
Nerve: ventral branches of cervical nerves