What does anterior posterior ventral and dorsal mean?
Anterior or ventral – front (example, the kneecap is located on the anterior side of the leg). Posterior or dorsal – back (example, the shoulder blades are located on the posterior side of the body). Medial – toward the midline of the body (example, the middle toe is located at the medial side of the foot).
What is an example of an animal with asymmetric symmetry?
Sessile animals such as sponges are asymmetrical. Corals build colonies that are not symmetrical, but the individual polyps exhibit radial symmetry. Alpheidae feature asymmetrical claws that lack pincers, the larger of which can grow on either side of the body, and if lost can develop on the opposite arm instead.
In which of the following animals have bilaterally symmetrical body?
Examples of animals that possess bilateral symmetry are: flatworms, common worms (“ribbon worms”), clams, snails, octopuses, crustaceans, insects, spiders, brachiopods, sea stars, sea urchins, and vertebrates. The symmetry of an animal generally fits its lifestyle.
Which animal has its Aboral surface facing up?
Sea stars (class Asteroidea) and brittle stars (class Ophiuroidea) have flat bodies with a broad aboral surface facing up and an oral surface facing down.
What is dorsal and ventral surface?
In general, ventral refers to the front of the body, and dorsal refers to the back. These terms are also known as anterior and posterior, respectively. Similarly, for the feet, the dorsal side is the top of the foot, or the area facing upwards when standing upright.
What is the ventral surface in quadruped animals?
For example, in a typical quadruped such as a cat, the anterior (front) end moves forward and the posterior or caudal (tail) end follows. The dorsal (top) side is kept facing upward and the ventral (bottom) side is kept down and usually specialized for locomotion.
What animals display asymmetry?
Some of the animals that exhibit external asymmetry include:
- Plaice. Plaice refers to a group of flatfish that is made up of 4species (scale-eye, Alaskan, American, and European plaice).
- Wrybill.
- Fiddler Crab.
- Narwhale.
- Sperm Whales.
- Honey Badger.
- Snails.
- Pareas Iwasaki.
Are there any asymmetrical animals?
Asymmetry. Only members of the phylum Porifera (sponges) have no body plan symmetry. There are some fish species, such as flounder, that lack symmetry as adults.
Does Starfish show bilateral symmetry?
Unauthorized use is prohibited. These three challenges revealed that starfish have a hidden bilateral symmetry, and move in a preferred direction. That’s especially obvious when they face stressful situations, such as fleeing or having to turn themselves over. They tend to lead with the fifth arm.
Do fishes have bilateral symmetry?
Mostly all marine organisms, including all vertebrates and some invertebrates are bilaterally symmetrical. This includes marine mammals such as dolphins and whales, fish, lobsters, and sea turtles.
What is the Aboral surface of jellyfish called?
The upper or aboral surface is called the exumbrella and the lower surface is called the subumbrella; the mouth is on the lower surface, which may be partially closed by a membrane extending inward from the margin (called the velum).
Which is the dorsal surface of an animal?
Dorsum is a Latin word meaning “back.” Thus, dorsal refers to the animal’s back or the backside of any other structures; for example, the posterior surface of the human leg is its dorsal surface. The term ventral derives from the Latin term venter, meaning “belly,” and always refers to the belly side of animals.
Is the term anterior or posterior dorsal or ventral?
Depending on the orientation of the organism, these terms may be synonymous in some instances but be orthogonal in other instances). Sometimes anterior/posterior would be synonymous with ventral/dorsal, as is the case in humans or other bipedal organisms.
Which is superior dorsal or ventral in birds?
In other instances (e.g., in quadrupeds, fish or birds ), posterior/anterior lies relatively orthogonal to the dorsal/ventral orientation. In these cases, dorsal/ventral is instead synonymous with superior (from Latin superior, comparative of superus “that is above,” from super “above”) and inferior (from Latin inferus meaning “low” or “below”).
What can the ventral surface also be called?
In humans, the dorsal surface can also be called the (VENTRAL) surface; however in quadruped animals, the dorsal surface is the (POSTERIOR) surface. Likewise, what is the difference between dorsal and ventral? Ventral means ‘towards the stomach’. In humans, it’s towards the front (and generally means the same thing as ‘anterior’).