Origin: first costal cartilage. Insertion: thyroid cartilage. Action: draw the hyoid apparatus, larynx and tongue caudally. Nerve: ventral branches of cervical nerves.

Thyrohyoid motoneurons are distributed between the caudal end of the hypoglossal motonucleus and the more dorsal and medial part of the ventral horn of C1. A similar location for these motoneurons has been reported by Yoshida et al., (1983) in the cat.

Despite a wealth of information about the respiratory behavior of pharyngeal dilator muscles such as the genioglossus, sternohyoid, and sternothyroid muscles, little is known about their contractile and endurance properties.

Sternothyroid Cat information: sternothyroid origin: first costal cartilage deep to the sternohyoid insertion: lateral half of cranial boder of thyroid cartilage nerve: hypoglossal (XII) and ventral ramus of C1 action: draws larynx caudally Human information: sternothyroid origin: posterior surface of manubrium insertion: thyroid cartilage

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Cats with thyroid tumours typically present for clinical signs of hyperthyroidism, dogs for a palpable mass. Although dogs with thyroid tumours are rarely hyperthyroid, elevated T4 in a dog is almost certainly due to a thyroid tumour (rather than hyperplasia).

The sternothyroid muscle (or sternothyroideus) is an infrahyoid muscle of the neck. [1] It acts to depress the hyoid bone.

1981). The prevalence of hyperthyroidism in cats has much increased since it was first reported. Increased awareness of the disease, environmental factors and better veterinary care most likely play an important role in this aspect. The overall prevalence varies geo-graphically from 2.4% to 11.4%, with more specifi-

Oct 28, 2016 · In the first part of this review article, thyroid anatomy, physiology and pathophysiology are reviewed to continue more specifically on hyperthyroidism, the most common thyroid disorder in cats....

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