The thyrohyoid membrane is one of the extrinsic membranes that compose the larynx. It is a broad fibro-elastic layer named for its attachments as it attaches the upper border of the thyroid cartilage to the hyoid bone. The thicker median section of the membrane is the thyrohyoid ligament.

Where does the thyrohyoid originate?

Origin. The thyrohyoid is a paired broad, short muscle that originates along the oblique line on the lamina of the thyroid cartilage.

What is the origin of the thyroid cartilage?

The thyroid originates from two main structures: the primitive pharynx and the neural crest. The rudimentary lateral thyroid develops from neural crest cells, while the median thyroid, which forms the bulk of the gland, arises from the primitive pharynx.

What is the origin and insertion of the Sternothyroid?

The sternothyroid arises from the posterior surface of the manubrium of the sternum, below the origin of the sternohyoid. It also arises from the edge of the cartilage of the first rib. It is inserted into the oblique line on the lamina of the thyroid cartilage.

Does the Thyrohyoid depress the larynx?

The thyrohyoid elevates the larynx whereas the sternothyroid depress the larynx. The omohyoid also has a function in ensuring proper venous blood return through its attachment to the carotid sheath.

ENDOSYMBIOSIS

43 related questions found

What is the origin of Sternocleidomastoid?

Sternocleidomastoid Attachments

It originates on the anterior surface of the manubrium, and the superior border and anterior surface of the medial third of the clavicle. The SCM converges into one point and inserts on the lateral surface of the mastoid process and the nuchal line of the occipital bone.

What is thyroid membrane?

The thyrohyoid membrane is one of the extrinsic membranes that compose the larynx. It is a broad fibro-elastic layer named for its attachments as it attaches the upper border of the thyroid cartilage to the hyoid bone. The thicker median section of the membrane is the thyrohyoid ligament.

What is a lingual thyroid?

Lingual thyroid is an abnormal mass of ectopic thyroid tissue seen in base of tongue caused due to embryological aberrancy in development of thyroid gland. Most of the ectopic tissue is seen in the tongue.

What is the anatomy of the thyroid gland?

The thyroid is a butterfly-shaped gland that sits low on the front of the neck. Your thyroid lies below your Adam's apple, along the front of the windpipe. The thyroid has two side lobes, connected by a bridge (isthmus) in the middle. When the thyroid is its normal size, you can't feel it.

What Innervates the Geniohyoid?

Innervation. The geniohyoid muscles are innervated by a branch of the ventral ramus of C1 from the cervical plexus which courses with the hypoglossal nerve in to the floor of the mouth.

Where is the thyrohyoid ligament?

Anatomical terminology

The lateral thyrohyoid ligament (lateral hyothyroid ligament) is a round elastic cord, which forms the posterior border of the thyrohyoid 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.

What is the origin of Styloglossus muscle?

The styloglossus muscle is an extrinsic muscle of the tongue, and its origin in the styloid process of the temporal bone is well documented. However, some authors have noted variations in its origin.

What is superior laryngeal nerve?

The superior laryngeal nerve, a branch of the vagus nerve, innervates the cricothyroid muscle of the larynx. This muscle stretches, tenses, and adducts the vocal cord. Superior laryngeal neuralgia usually appears as a postsurgical complication.

What nerve Innervates the Stylopharyngeus?

All the muscles of the pharynx receive innervation from the tenth cranial nerve (vagus nerve) except the stylopharyngeus, which is innervated by the ninth cranial nerve (glossopharyngeal nerve).

What causes lingual thyroid?

Lingual thyroid is a mass of ectopic thyroid tissue, located at the base of the tongue, caused by a developmental anomaly of the descent of thyroid gland [3]. The thyroid gland develops as an endodermal diverticulum between the first and second pharyngeal pouches.

Is lingual thyroid hereditary?

Autotransplantation of thyroid tissue has been tried on rare occasions when no other thyroid tissue is present, and it has apparently been successful. A lingual thyroid was reported in two brothers, which suggests that this condition may be inherited.

How is lingual thyroid diagnosed?

The diagnosis of lingual thyroid is largely dependent on clinical awareness [3]. Once this disease is suspected, a complete thyroid functional test and the imaging tools are required. The diagnostic battery includes head and neck ultrasonography, scintigraphy, CT, and magnetic resonance imaging (MRI) [4].

What is the Cricovocal membrane?

The cricothyroid ligament (also known as the cricothyroid membrane or cricovocal membrane) is a ligament in the neck. It connects the cricoid cartilage to the thyroid cartilage. It prevents these cartilages from moving too far apart. It is cut during an emergency cricothyrotomy to treat upper airway obstruction.

What penetrates the thyrohyoid membrane?

The internal branch of superior laryngeal nerve (IBSLN) pierces the thyrohyoid membrane above the entrance of superior laryngeal artery.

What is the name of the mucosal membrane extending between the epiglottis and Arytenoids?

The quadrangular membrane, another submucosal sheet, extends between the lateral aspects of the epiglottis and the anterolateral surface of the arytenoid cartilages on each side.

What is the origin insertion and action of Sternocleidomastoid?

It is a 'two headed' muscle, meaning it has two origin sites and one insertion site. The SCM's origins are the sternum and clavicle and its insertion is the mastoid process behind the ear. The actions of the SCM are to flex and rotate the head. It does this by contracting both SCMs together or one alone, respectively.

What is the origin of the sternocleidomastoid quizlet?

The sternocleidomastoid muscle is a two-headed neck muscle, which true to its name bears attachments to the manubrium of sternum (sterno-), the clavicle (-cleido-), and the mastoid process of the temporal bone (-mastoid). ... It makes up the bulk of the chest muscles and lies under the breast.

What is the origin of the trapezius muscle?

It originates on the occipital bone, the ligamentum nuchae, and the spinous processes of T01–T12. The trapezius inserts on the lateral third of the clavicle, as well as the acromion and scapular spine of the scapula. Image from Human Anatomy Atlas.