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The dorsal fin is reduced to a tiny triangle, and the pectoral fins are longer than the head.
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dorsal and fin
Spotted Dolphin The pectoral fin and dorsal fin of the dolphin contribute to its agility and speed in the water.
The pectoral fins are movable and used in maneuvering ; the dorsal fin is fixed and contributes stability, and the tail is used for propulsion, as well as maneuvering.
Swimming water animals such as fish and cetaceans actively use pectoral fins for maneuvering, and dorsal fins contribute stability as the animal swims, propelling and maneuvering with its tail, itself recognizable as a fin.
The gray whale also lacks a dorsal fin, instead bearing 6 to 12 dorsal crenulations (" knuckles "), which are raised bumps on the midline of its rear quarter, leading to the flukes.
The gray or white area around the dorsal fin, known as the " saddle patch ", often contains some black colouring in residents.
Offshores appear to be smaller than the others, and females are characterized by dorsal fin tips that are continuously rounded.
Most of the dark parts of its body are medium gray instead of black, although it has a dark gray patch called a " dorsal cape " stretching back from its forehead to just behind its dorsal fin.
It is immediately recognizable by its extremely small white eye patch, shorter than usual dorsal fin, and bulbous head ( similar to a pilot whale ).
alt = Killer whale with only top of back and dorsal fin visible above water surface, the dorsal fin curves backward at the tip.
At about the male's dorsal fin is more than twice the size of the female's and is more of a triangular shape — a tall, elongated isosceles triangle — whereas hers is shorter and more curved.
Variations such as nicks, scratches, and tears on the dorsal fin and the pattern of white or grey in the saddle patch are unique.
alt = Back and dorsal fin of killer whale projecting above the sea surface, including the grey saddle patch and part of the white eye patch: The dorsal fin rises steeply to a rounded point.
dorsal and is
In aquatic salamanders and in frog tadpoles, the tail has dorsal and ventral fins and is moved from side to side as a means of propulsion.
The three sepals are generally colourful and bright ( which is why they are sometimes called outer tepals ), with one on each side (" lateral sepals ") and one usually at the top of the flower (" dorsal sepal "), sometimes forming a hood.
This is generally caused by dysfunction of the dorsal columns of the spinal cord, because they carry proprioceptive information up to the brain.
A second, dorsal aorta carries oxygenated blood from the gills to the rest of the body, and is homologous with the descending aorta of tetrapods.
In all craniates except for hagfish, the dorsal hollow nerve cord is surrounded with cartilaginous or bony vertebrae and the notochord is generally reduced ; hence, hagfish are not universally regarded as vertebrates, though recent DNA comparisons suggest that they are in fact vertebrates.
But with a few striking exceptions, such as Xavante and Tahitian-which have no dorsal consonants whatsoever-nearly all other languages have at least one velar consonant: the few languages that do not have a simple usually have a consonant that is very similar.
The CNS is contained within the dorsal cavity, with the brain in the cranial cavity and the spinal cord in the spinal cavity.
Like type B, it is primarily white and medium gray, with a dark gray dorsal cape and yellow-tinged patches.
Slow pain is transmitted via slower type C fibers to laminae II and III of the dorsal horns, together known as the substantia gelatinosa.
The central analgesia system is mediated by 3 major components: the periaquaductal grey matter, the nucleus raphe magnus and the nociception inhibitory neurons within the dorsal horns of the spinal cord, which act to inhibit nociception-transmitting neurons also located in the spinal dorsal horn.
The nostrils are located on the dorsal surface of the snout, while the eyes and ears are located in a groove set just back from it ; this groove is closed when swimming.
Unlike the passive articulation, which is a continuum, there are five discrete active articulators: the lip ( labial consonants ), the flexible front of the tongue ( coronal consonants: laminal, apical, and subapical ), the middle – back of the tongue ( dorsal consonants ), the root of the tongue together with the epiglottis ( radical consonants ), and the larynx ( laryngeal consonants ).
The authors proposed that both thin ( pain ) and large diameter ( touch, pressure, vibration ) nerve fibers carry information from the site of injury to two destinations in the dorsal horn of the spinal cord, and that the more large fiber activity relative to thin fiber activity at the inhibitory cell, the less pain is felt.
However, movement is usually quite precise ; dorsal and anal fins aid in manoeuvring and stabilizing.
The uterus is located inside the pelvis immediately dorsal ( and usually somewhat rostral ) to the urinary bladder and ventral to the rectum.
dorsal and reduced
In 1891, American otorhinolaryngologist John Roe presented an example of his work, a young woman on whom he reduced a dorsal nasal hump for cosmetic indications.
( 2002 ) showed that alterations to the ventral hippocampus reduced the amount of information sent to the amygdala by the dorsal and ventral hippocampus, consequentially altering fear conditioning in rats.
Hominoids have more mobile shoulder joints and arms due to the dorsal position of the scapula, broad ribcages that are flatter front-to-back, and a shorter, less mobile spine compared to Old World monkeys, with caudal ( tail ) vertebrae greatly reduced, resulting in complete tail loss in living species.
Swamp eels are almost entirely finless ; the pectoral and pelvic fins are absent, the dorsal and anal fins are vestigial, reduced to rayless ridges, and the caudal fin ranges from small to absent, depending on species.
Participants with ADHD were found to have reduced activation in the dorsal area of the ACC when performing the Stroop task.
Electric rays have a rounded pectoral disc with two moderately large rounded-angular ( not pointed or hooked ) dorsal fins ( reduced in some narkids ), and a stout, muscular tail with a well-developed caudal fin.
Because these males have reduced dorsal pigmentation, resulting a pearlescent white appearance, they have been dubbed " white stickleback ".
The males of galleriine moths have a gnathos almost or completely reduced, the pupae have a prominent dorsal median ridge on the thorax and abdomen, and most larvae have a sclerotised ring around seta SD1 of the first abdominal segment.
Research has found that the dorsal APN best diminished the perception of brief pain whereas the ventral APN reduced the perception of chronic pain.
They also have some unique physical features that distinguish them from the ascidiaceans, including a severely reduced pharynx, the retention of the dorsal nerve cord as adults, the superficial position of their ganglion and the unique histology of the cells of their digestive tracts.