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Cervical thymic cyst. A cervical thymic cyst, also called thymopharyngeal duct cyst, is a fluid-filled mass that occurs when the thymopharyngeal duct, an embryonic structure connecting the nascent thymus with the embryonic pharynx, fails to close and disappear. [1] A thymic cyst is typically a solitary mass on one side of the neck, and is ...
Thyroglossal cyst usually presents as a midline neck lump (in the region of the hyoid bone) that is usually painless, smooth and cystic, though if infected, pain can occur. There may be difficulty breathing, dysphagia (difficulty swallowing), or dyspepsia (discomfort in the upper abdomen), especially if the cyst becomes large. [citation needed]
A pharyngeal groove (or branchial groove, or pharyngeal cleft [1]) is made up of ectoderm unlike its counterpart the pharyngeal pouch on the endodermal side. The first pharyngeal groove produces the external auditory meatus (ear canal). [2] The rest (2, 3, and 4) are overlapped by the growing second pharyngeal arch, and form the floor of the ...
Otocephaly, also known as agnathia–otocephaly complex, is a very rare and lethal cephalic disorder characterized by the absence of the mandible ( agnathia ), with the ears fused together just below the chin (synotia). It is caused by a disruption to the development of the first branchial arch. It occurs in every 1 in 70,000 embryos.
Laryngeal cysts are cysts involving the larynx or more frequently supraglottic locations, such as epiglottis and vallecula. [1] Usually they do not extend to the thyroid cartilage. [2] They may be present congenitally [3] or may develop eventually due to degenerative cause. [4] They often interfere with phonation .
Specialty. Medical genetics. A webbed neck, or pterygium colli, is a congenital skin fold that runs along the sides of the neck down to the shoulders . There are many variants.
Cysts of the jaws. A cyst is a pathological epithelial lined cavity that fills with fluid or soft material and usually grows from internal pressure generated by fluid being drawn into the cavity from osmosis (hydrostatic pressure). The bones of the jaws, the mandible and maxilla, are the bones with the highest prevalence of cysts in the human body.
Branchial apparatus, an embryological structure. Branchial arch a series of bony "loops" present in fish, which support the gills. Branchial artery, also known as aortic arches. Branchial cleft cyst, failure of obliteration of the second branchial cleft in embryonic development. Branchial efferent, also known as special visceral efferent.