Principal innervation of the thyroid gland derives from the autonomic nervous system. Parasympathetic fibers come from the vagus nerves, and sympathetic fibers are distributed from the superior, middle, and inferior ganglia of the sympathetic trunk. These small nerves enter the gland along with the blood vessels.

What nerve innervates the thyroid cartilage?

The parasympathetic division of the autonomic nervous system is the primary innervation of the thyroid gland, via the vagus nerve (CNX).

What nerve runs with inferior thyroid artery?

The recurrent laryngeal nerve passes upward generally behind, but occasionally in front of, the inferior thyroid artery. This makes it vulnerable to injury during surgery that involves ligating the inferior thyroid artery, such as excision of the lower pole of the thyroid gland.

Which nerve is related to upper pole of thyroid gland?

The external branch of the superior laryngeal nerve (ELN) is intimately associated with the superior thyroid artery (STA) in relation to the superior pole of the thyroid gland, rendering it vulnerable to injury during the ligation of this vessel during thyroidectomy.

What regulates the function of the thyroid gland?

The hypothalamus and the pituitary gland, which are located in the brain, help control the thyroid gland. The hypothalamus releases thyrotropin-releasing hormone (TRH), which stimulates the pituitary gland to release thyroid-stimulating hormone (TSH).

What is zuckerkandl tubercle?

Background. Zuckerkandl tubercle (ZT) is a lateral projection from the lateral thyroid lobe which is a constant landmark for finding the recurrent laryngeal nerve during thyroid surgery. It is the condensed thyroid parenchyma located in the cricothyroid junction.

Is the vagus nerve near the thyroid?

For thyroid surgery, the VN is located within the carotid sheath; the surgeons usually pay less attention to the VNs than recurrent laryngeal nerve. However, for both variations, the VN is near the thyroid gland and may be injured during lateral dissection during a thyroidectomy.

What cavity is the thyroid in?

As the thyroid gland develops, it separates from the floor of the mouth cavity by involution of the thyroglossal duct and it migrates caudally into the neck.

Which nerve carries parasympathetic impulses to the thyroid gland?

Vagus nerveTA98A14.2.01.153TA26332FMA5731Anatomical terms of neuroanatomy

What does the recurrent laryngeal nerve innervate?

The recurrent laryngeal nerves supply sensation to the larynx below the vocal cords, give cardiac branches to the deep cardiac plexus, and branch to the trachea, esophagus and the inferior constrictor muscles.

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What nerve runs with superior thyroid artery?

The external laryngeal nerve runs in close proximity to the origin of the superior thyroid artery in relation to the thyroid gland. The superior thyroid artery is clinically important in head and neck surgeries.

What is lingual nerve?

The lingual nerve is one of the sensory branches of the mandibular division of the trigeminal nerve. [5] It contains general somatic afferent nerve fibers and, after chorda tympani joins it, also carries general visceral efferent nerve fibers and special visceral afferent fibers.

Where is the tracheoesophageal groove?

The RLN enters the larynx posterior to the cricothyroid joint and inferior to the inferior constrictor muscle. 3 Tracheoesophageal groove is the sulcus formed because of the abutment of the trachea anteriorly and esophagus posteriorly and is useful for identifying the RLN.

What do T3 and T4 regulate?

The thyroid gland releases triiodothyronine (T3) and thyroxine (T4). These hormones play an important role in regulation of your weight, energy levels, internal temperature, skin, hair, nail growth, and more.

What is T3 and T4 thyroid?

The thyroid produces a hormone called triiodothyronine, known as T3. It also produces a hormone called thyroxine, known as T4. Together, these hormones regulate your body’s temperature, metabolism, and heart rate.

How does T3 and T4 work?

Thyroid cells are the only cells in the body which can absorb iodine. These cells combine iodine and the amino acid tyrosine to make T3 and T4. T3 and T4 are then released into the blood stream and are transported throughout the body where they control metabolism (conversion of oxygen and calories to energy).

What part of nervous system is thyroid?

The thyroid gland is a key part of the human endocrine system and works together with your nervous and immune systems to regulate your body’s metabolism.

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.

How is the vagus nerve stimulated?

Loud gargling with water or loud singing activates our vocal cords which in turn stimulates the vagus nerve. Foot massage: gentle or firm touch can assist in stimulation the vagus nerve. Cold water face immersion: immerse your forehead eyes and at least 2/3 of both cheeks into cold water.

What is pyramidal lobe of thyroid?

The pyramidal lobe of thyroid (also known as Lalouette pyramid 5) is a normal anatomic variant representing a superior sliver of thyroid tissue arising from the thyroid isthmus. It is seen as a third thyroid lobe and is present in 10-30% of the population. It represents a persistent remnant of the thyroglossal duct.

What is the organ of zuckerkandl?

The organ of Zuckerkandl is a chromaffin body derived from neural crest located at the bifurcation of the aorta or at the origin of the inferior mesenteric artery. It can be the source of a paraganglioma.

What is non recurrent laryngeal nerve?

A nonrecurrent laryngeal nerve (NRLN) is a rare anatomical variation in which the nerve enters the larynx directly from the cervical vagus nerve, without descending to the thoracic level [2]. It has been reported in 0.3-0.8% of the population on the right side, being extremely rare on the left side (0.004%) [3].

Which of the following nerves has parasympathetic axons?

The nerves that supply parasympathetic fibers to the parasympathetic ganglia of the head include the oculomotor nerve (ciliary ganglion), the facial nerve (pterygopalatine ganglion, submandibular ganglion), the glossopharyngeal nerve (otic ganglion), the vagus nerve, and the pelvic splanchnic nerves.

What is the parasympathetic nervous system characterized by?

The parasympathetic nervous system is characterized by long preganglionic and very short postganglionic nerves and, with only a few exceptions, an absence of well-defined, anatomically distinct ganglia.

What does the sympathetic division of the autonomic nervous system control?

The sympathetic division of the autonomic nervous system regulates the flight-or-fight responses. This division also performs such tasks as relaxing the bladder, speeding up heart rate, and dilating eye pupils.

What are the parts of the thyroid gland?

The thyroid gland lies in the front of your neck in a position just below your Adam’s apple. It is made up of two lobes – the right lobe and the left lobe, each about the size of a plum cut in half – and these two lobes are joined by a small bridge of thyroid tissue called the isthmus.

Is the thyroid gland in the thoracic cavity?

The thyroid gland is typically located in the lower third of the neck in front of the trachea (wind pipe) and above the breast bone. In some patients, the thyroid gland or masses within the gland can grow large and extend into the upper chest into a space known as the mediastinum. This is known as a substernal thyroid.

What is thyroid gland made up of?

The thyroid tissue is made up of 2 types of cells: follicular cells and parafollicular cells. Most of the thyroid tissue consists of follicles lined by the follicular cells, which secrete the iodine-containing thyroid hormones.

What does vagus nerve innervate?

The recurrent laryngeal nerve branches from the vagus in the lower neck and upper thorax to innervate the muscles of the larynx (voice box). The vagus also gives off cardiac, esophageal, and pulmonary branches. In the abdomen the vagus innervates the greater part of the digestive tract and other abdominal viscera.

What nerve Innervates vocal cords?

The vocal cords play a crucial role in phonation. The muscles that are responsible for vocal cord movement are mainly innervated by the recurrent laryngeal nerves. The recurrent laryngeal nerves are branches of the vagal nerves.

What cranial nerve Innervates the epiglottis?

The epiglottis is innervated by the ISLN and L-IX nerves.