Greater cornu
Encyclopedia
The greater cornua of the hyoid bone project backward from the lateral borders of the body; they are flattened from above downward and diminish in size from before backward; each ends in a tubercle to which is fixed the lateral hyothyroid ligament
.
The upper surface is rough close to its lateral border, for muscular attachments: the largest of these are the origins of the hyoglossus
and Constrictor pharyngis medius which extend along the whole length of the cornu; the digastric muscle
and stylohyoid muscle
have small insertions in front of these near the junction of the body with the cornu.
To the medial border the hyothyroid membrane
is attached, while the anterior half of the lateral border gives insertion to the thyrohyoid.
The greater cornua derive from the 3rd pharyngeal arches.
Lateral hyothyroid ligament
The lateral thyrohyoid ligament is a round elastic cord, which forms the posterior border of the hyothyroid membrane and passes between the tip of the superior cornu of the thyroid cartilage and the extremity of the greater cornu of the hyoid bone...
.
The upper surface is rough close to its lateral border, for muscular attachments: the largest of these are the origins of the hyoglossus
Hyoglossus
The Hyoglossus, thin and quadrilateral, arises from the side of the body and from the whole length of the greater cornu of the hyoid bone, and passes almost vertically upward to enter the side of the tongue, between the Styloglossus and Longitudinalis inferior....
and Constrictor pharyngis medius which extend along the whole length of the cornu; the digastric muscle
Digastric muscle
The digastric muscle is a small muscle located under the jaw. so digastric muscles are muscle fibers in ligament of treitz ,omohyoid , occipitofrontalis....
and stylohyoid muscle
Stylohyoid muscle
The stylohyoid muscle is a slender muscle, lying anterior, and superior of the posterior belly of the digastric muscle. It shares this muscle's innervation by the facial nerve, and functions to draw the hyoid bone backwards and elevate the tongue....
have small insertions in front of these near the junction of the body with the cornu.
To the medial border the hyothyroid membrane
Hyothyroid membrane
The hyothyroid membrane is a broad, fibro-elastic layer, attached below to the upper border of the thyroid cartilage and to the front of its superior cornu, and above to the upper margin of the posterior surface of the body and greater cornua of the hyoid bone, thus passing behind the posterior...
is attached, while the anterior half of the lateral border gives insertion to the thyrohyoid.
The greater cornua derive from the 3rd pharyngeal arches.