What is Protrusible pharynx?
The pharynx is a muscular, protrusible tube. During feeding, the pharynx is extended far out of the mouth to reach the food. The proximal end of the pharynx opens into the intestine which, in triclads, immediately divides into three branches one anterior and two posterior branches.
What means Protrusible?
Definitions of protrusible. adjective. capable of being thrust forward, as the tongue. synonyms: protrusile extensible, extensile. capable of being protruded or stretched or opened out.
What is a Protrusible mouth?
protrusible mouth (protractile mouth) In fish, a structural arrangement of the jaws that enables the animal to protrude (extend) or withdraw the mouth at will. When fully protruded, the cavity of the mouth is enlarged to form a funnel-like space facilitating the uptake of food…. …
What did jaws evolve from?
Jaws probably originated in the pharyngeal arches supporting the gills of jawless fish. The earliest jaws appeared in now extinct placoderms and spiny sharks during the Silurian, about 430 million years ago.
What is Protrusible proboscis?
Capable of being thrust outward, as the proboscis of many insects. adjective. Capable of being thrust outward, as the proboscis of many insects.
What does Eversible mean?
capable of being everted
capable of being everted.
What is a long skinny fish called?
needlefish
needlefish, any of the long, slim, primarily marine fishes of the family Belonidae (order Atheriniformes), found throughout temperate and tropical waters. Needlefish are adept jumpers, carnivorous in habit, and distinguished by long, slender jaws equipped with sharp teeth.
How did vertebrates get jaws?
Jawed vertebrates arose from non-jawed vertebrates that had a pharyngeal gill apparatus composed of gill bars and slits. Anterior gill bars evolved into the jaw, which supports structures in vertebrates.
Where are the larynx and the pharynx located?
The pharynx and larynx are two components or structures found in the neck region of the vertebrate. The pharynx is the digestive and respiratory systems and lacks a vocal cord. On the other hand, the larynx is part of only the respiratory system, and it is where the vocal cord is found.
Is the hypopharynx part of the oropharynx?
Hypopharynx. The hypopharynx or laryngopharynx forms the most inferior portion of the pharynx, being the continuation of the oropharynx superiorly and both the larynx and esophagus inferiorly. It also forms part of the upper respiratory tract.
What are the 9 cartilages of the larynx?
The laryngeal skeleton is nine cartilages: the thyroid cartilage, cricoid cartilage, epiglottis, arytenoid cartilages, corniculate cartilages, and cuneiform cartilages. The first three are unpaired cartilages, and the latter three are paired cartilages.
What are the medical conditions that affect the larynx?
This part of the body can be subject to a number of significant medical conditions, including bacterial infection (laryngitis), laryngeal cancer, and vocal fold paralysis (VFP), which can seriously compromise function. The larynx is a complex band of cartilage, ligament, and muscle as well as a mucous membrane.