Which animal has a nerve ring?

The nerve ring of hydra is a ring of neurons whose neurites make a bundle running circumferentially around the hypostome just above the tentacle zone. This nervous structure has unique features in the hydra nervous system.

1. Do cnidarians have a nerve ring?
2. What animals have nerves?
3. Where do you find nerve ring?
4. Which animal has a nerve net that controls its body?
5. Does a hydra have a nerve net?
6. Do echinoderms have a nerve ring?
7. Which is the most nervous animal?
8. Which animal has nervous system but no brain?
9. What animals feel no pain?
10. What are nerve rings?
11. What is nerve ring in earthworm?
12. Which of the following animals has a ventral nerve cord?
13. Do squids have nerve net?
14. What is the most primitive animal with a brain?

Do cnidarians have a nerve ring?

The cnidarian nervous system has been considered to consist of a nerve net extending throughout the body, called diffuse nervous system. However, we can observe a nerve ring in the head of the Hydra polyp (Cnidaria: Hydrazoa) (Grimmelikhuijzen, 1985, Dunne et al., 1985, Koizumi et al., 1992).

What animals have nerves?

Nervous systems are found in almost all multicellular animals, but vary greatly in complexity. The only multicellular animals that have no nervous system at all are sponges and microscopic bloblike organisms called placozoans and mesozoans.

Where do you find nerve ring?

A circumesophageal or circumpharyngeal nerve ring is an arrangement of nerve ganglia around the esophagus/ pharynx of an animal.

Which animal has a nerve net that controls its body?

A nerve net is a simple, decentralized, multipolar multipolar nervous system found in animals like jellyfish. Cephalized animals have brains of varying complexity. Complex brains are typically compartmentalized, with separate but interconnected structures for functions such as olfaction, vision, and integration.

Does a hydra have a nerve net?

Hydra's nerve net actually has two separate components: one in the endoderm and one in the ectoderm. The morphology of both sensory cells and ganglion cells can vary, in terms of the size of their cell body and the ramification of their neurites [5]. The function of the nerve nets in Hydra is poorly understood.

Do echinoderms have a nerve ring?

The echinoderm nervous system primarily consists of a circumoral nerve ring connected to five radial nerve cords that run between the longitudinal and circular muscles of the body.

Which is the most nervous animal?

The Opossum: L.A.'s Most Anxious Animal.

Which animal has nervous system but no brain?

Step by step answer:Hydra has anatomically one of the simplest nervous systems which is a nerve net formed by the nerve cells present in the epidermis of the Hydra with no sign of a brain.

What animals feel no pain?

Though it has been argued that most invertebrates do not feel pain, there is some evidence that invertebrates, especially the decapod crustaceans (e.g. crabs and lobsters) and cephalopods (e.g. octopuses), exhibit behavioural and physiological reactions indicating they may have the capacity for this experience.

What are nerve rings?

Definition of nerve ring

: a ring of nervous tissue especially : a ring of concentrated nervous tissue about the pharynx of various invertebrate animals.

What is nerve ring in earthworm?

Nerve ring is an oblique ring around the pharynx in 3^rd and 4^th segments. Its mid-dorsal part comprises of a pair of small and fused supra-pharyngeal ganglia, also called cerebral ganglia or brain.

Which of the following animals has a ventral nerve cord?

Ventral nerve cords are found in some phyla of the bilaterians, particularly within the nematodes, annelids and the arthropods.

Do squids have nerve net?

Flatworms also have eyespots called "ocelli". The ocelli are sensitive to light and are connected to the cerebral ganglia. Generally, the flatworm avoids light. The nervous system of the earthworm is "segmented" just like the rest of the body.

What is the most primitive animal with a brain?

The most primitive ani- mals alive today that possess a true brain are the free-living flatworms, the turbellarian platyhelminthes. The planarian flatworms are the best known, having achieved some notoriety in earlier controversies over RNA and memory.