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The muscles creating this movement are the ceratohyoid muscles and are connected to the hyoid apparatus in the throat and larynx area. [9] Though the purpose of these displays is unclear, the colors of the dewlap and the movements during the displays are thought to be a way of standing out against visual background noise.
They are on each side of the frenulum (the piece of tissue connecting the bottom of the tongue to the inside of the mouth) under the tongue and run parallel next to the two distinct veins. They typically appear in pairs and may even be up to 4 or more sets, but for even those who have them only two closer to the tip are distinctly visible while ...
This type of snake are ambush predators, lurking at the bottom of rivers, streams and estuaries, and waiting for fish to approach, which they grip with their coils. The rough scales allow them to hold the fish despite the mucus coating. Adults grow to between 60 cm and 2.43 m in length.
Scales in the central or throat region, which are in contact with the first ventral scales of a snake's body and are flanked by the chin shields, are called gular scales. The mental groove is a longitudinal groove on the underside of the head between the large, paired chin shields and continuing between the smaller gular scales.
Sensation of a 'lump' in the back of the throat; Throat feels swollen; Discomfort - Lump can often feel quite big and pain is occasional; Symptoms normally worse in the evening; Stress aggravates the symptoms; Saliva is difficult to swallow, yet food is easy to swallow - eating, in fact, often makes the tightness go away for a time 'Lump ...
The snakes do not have a true venom gland, but they do have an analogous structure called the Duvernoy's gland derived from the same tissue. [4] Most subspecies are rear-fanged with the last maxillary teeth on both sides of the upper jaw being longer and channeled; [ 4 ] the notable exception is D. p. edwardsii , which is fangless. [ 7 ]
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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.