The dorsal fin is small, visible only briefly during the dive sequence.

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.

Female residents characteristically have rounded dorsal fin tips that terminate in a sharp corner.

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.

It has a heavy and robust body with a large dorsal fin up to tall.

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.

An individual killer whale can often be identified from its dorsal fin and saddle patch.

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.

Spinal disorders of various types may cause sensory ataxia from the lesioned level below, when they involve the dorsal columns

However, because of the large, scarred and nicked dorsal fins resembling those of mammal-hunting transients, they may also eat mammals and sharks.

The dorsal and anal fins are divided into anterior spiny and posterior soft-rayed portions, which may be partially or completely separated.

In contrast to the model based on functional morphology described earlier, in the Epitheliozoa concept the ventral and dorsal cell layers of the Placozoa are homologs of endoderm and ectoderm, the two basic embryonic cell layers of the eumetazoans — the digestive gastrodermis in the Cnidaria or the gut epithelium in the bilaterally symmetrical Bilateria may have developed from endoderm, whereas ectoderm is, among other things, the precursor to the external skin layer ( epidermis ).

Occupational therapy and Physical therapy regimens of assisted stretching, strengthening, functional tasks, and / or targeted physical activity and exercise are usually the chief ways to keep spastic CP well-managed, although if the spasticity is too much for the person to handle, other remedies may be considered, such as various antispasmodic medications, botox, baclofen, or even a neurosurgery known as a selective dorsal rhizotomy ( which eliminates the spasticity by eliminating the nerves causing it ).

The sea lions may respond to the dorsal fin of a killer whale and remain vigilant, even when encountering resident fish-eating pods.

Under persistent activation nociceptive transmission to the dorsal horn may induce a wind up phenomenon.

Hypofunction of serotonergic neurones arising from the dorsal raphe nucleus and GABAergic neurones that are widely distributed in the brain may result in a lack of inhibitory effect on the putative GAD pathway.

Hence, what is technically a transverse ( orthogonal ) section with respect to the body length axis of a rat ( dividing anterior from posterior ) may often be referred to in rat neuroanatomical coordinates as a coronal section, and likewise a coronal section with respect to the body ( i. e. dividing ventral from dorsal ) in a rat brain is referred to as transverse.

These visuospatial decificts may be related to damage to the dorsal cortical pathway for visual processing.

The number of dorsal vertebra to which it is attached vary from four to eight ; the number of costal attachments varies ; muscle fibers may or may not reach the crest of the ilium.

Catsharks may be distinguished by their elongated cat-like eyes and two small dorsal fins set far back.

It may be known by its wedge-shaped form, the broad end of the wedge constituting the dorsal, the narrow end the palmar surface ; and by its having four articular facets touching each other, and separated by sharp edges.

Lymphangitis of the dorsal penis may also occur and resembles a string or cord.

Most of its fins ( dorsal, pectoral, pelvic, and caudal ) have white tips ( juvenile specimens and some adults may lack these ).

A saddle-like marking may be apparent between first and second dorsal fins.

Several plesiomorphic characteristics may be useful in recognizing these spiders: there are tergite plates on the dorsal side and the almost-median position of the spinnerets on the ventral side of the opisthosoma.

They may also be known as ' dorsal vertebrae ', in the human context.

The Eastern Ribbon Snake upon first glance may be easily confused with the common Garter snake, but the Eastern Ribbon Snake is defined by 3 longitudinal yellow stripes on the dorsal side and a black or dark brown colouration.

There are several small red or rust-coloured spots on the back which may form dorsal striping.

Typical is the turquoise blue patch in the neck region, which may be segmented by a small red dorsal stripe.

On the back there often are a large number of small red-brick coloured dots which may form a faint mid dorsal stripe.

A more or less visible red mid dorsal strip may be present on the upper back.

Note that such descriptors ( dorsal / ventral, rostral / caudal ; medial / lateral ) are relative rather than absolute ( e. g., a lateral structure may be said to lie medial to something else that lies even more laterally ).

The muscles acting on the foot can be classified into extrinsic muscles, those originating on the anterior or posterior aspect of the lower leg, and intrinsic muscles, originating on the dorsal or plantar aspects of the foot.

:" The severity of mutilations for some of these individuals can be astounding – including long term survivors with completely severed tails, major tail mutilations, and multiple disfiguring dorsal lacerations.

In dorsal gestures different parts of the body of the tongue contact different parts of the roof of the mouth, but this cannot be independently controlled, so they are all subsumed under the term dorsal.

The caudate and putamen contain the same types of neurons and circuits-many neuroanatomists consider the dorsal striatum to be a single structure, divided into two parts by a large fiber tract, the internal capsule, passing through the middle.

It is known only from the dorsal and ventral impressions of a single animal and was estimated to be from snout to vent.

Pronounced differentiation between the ventral surface facing the substrate and the dorsal, facing away from it, accordingly led to the physiologically distinct cell layers of Trichoplax adhaerens that can still be seen today.

Besides these well known dorsalizing factors, further molecules known to be involved in dorsal ventral patterning are also present in S. kowalevskii, such as a netrin that groups with netrin gene class 1 and 2.

The shell around each somite can be divided into a dorsal tergum, ventral sternum and a lateral pleuron.

Studies in patients that were a subject to bilateral cingulotomy, that involved fMRI analyses, showed that the anterior cingulate cortex has a key role in cognitive control and is highly likely to be involved in the control of attentional response, whereas the dorsal part of that region of the brain was not identified to be involved in such a process, although this is still under dispute.

Because the dorsal and ventral portions of the its tail angle inward toward a point to create a clear angle, the tail is said to be notched.

The pikes tend to be lie-in-wait, ambush predators, with elongated snouts, long, well-muscled torsos, forked tails, and dorsal and anal fins set well back and opposite each other for rapid acceleration along a straight line, allowing the fish to quickly emerge from cover to capture their prey.

At first observation, the day after the operation, the back of Head's hand and the dorsal surface of his thumb were seen to be " completely insensitive to stimulation with cotton wool, to pricking with a pin, and to all degrees of heat and cold.

In the case of spastic diplegia there is also a permanent neurosurgical treatment for spasticity, selective dorsal rhizotomy, that directly targets nerves in the spine that cause the spasticity, and destroys them, so that the spasticity cannot be activated at all.

However, a cladistic analysis of the forelimb skeleton found it highly similar to the Great Crested Grebe and unlike the Painted Buttonquail ( now known to be a basal charadriiform lineage ), the Black-necked Stilt ( a more advanced charadriiform ), or the Limpkin ( a member of the Grui suborder of Gruiformes ), namely in that its dorsal condyle of the humerus was not angled at 20 °– 30 ° away from long axis of the humerus.

The migratory stomatitis in the oral cavity mucosa and the geographic tongue that confined to the dorsal and lateral aspects of the tongue mucosa, are believed to be oral manifestations of psoriasis, as being histologically identical to cutaneous psoriasis lesions and more prevalent among psoriasis patients, although these conditions are quite common in the non-psoriatic population, affecting 1 % to 2. 5 % of the general population.

This has led to the suggestion that one cause of tinnitus might be a homeostatic response of central dorsal cochlear nucleus auditory neurons that makes them hyperactive in compensation to auditory input loss.

This jack can be distinguished from the pilot fish by the presence of a first dorsal fin.

The dorsal fin can be seen moving steadily through the water with the tip of the tail moving from side to side behind it.