Dominic Stone
Ctenophores, also known as comb jellies, are the largest non-colonial animals that use cilia as their main method of locomotion. They have eight strips, called comb rows, that run the length of their bodies and bear comb-like bands of cilia, called ctenes. The ciliary rosettes in the canals may help transport nutrients to muscles in the mesoglea. The inner layer of the epidermis contains myoepithelial cells that act as muscles, and the inner surface of the cavity is lined with an epithelium, the gastrodermis, which has well-developed muscles. So, do ctenophores contain muscles?
| Characteristics | Values |
|---|---|
| Ctenophores and cnidarians | Have a type of muscle that, in more complex animals, arises from the middle cell layer |
| Comb jellies | Have more than 80 different cell types |
| Ctenophores | Are the largest non-colonial animals that use cilia as their main method of locomotion |
| Ctenophores | Have eight strips, called comb rows, that run the length of their bodies |
| Comb rows | Bear comb-like bands of cilia, called "ctenes", stacked along the comb rows so that when the cilia beat, those of each comb touch the comb below |
| Ciliary rosettes | May help to transport nutrients to muscles in the mesoglea |
| Anal pores | May eject unwanted small particles |
| Ciliary rosettes in the gastrodermis | May help to remove wastes from the mesoglea |
| Ciliary rosettes in the gastrodermis | May help to adjust the animal's buoyancy by pumping water into or out of the mesoglea |
| Outer surface | Bears eight comb rows, called swimming plates, which are used for swimming |
| Comb rows | Run from near the mouth (the "oral pole") to the opposite end (the "aboral pole") |
| Comb rows | Are spaced more or less evenly around the body |
| Comb rows | Extend only part of the distance from the aboral pole towards the mouth |
| Comb rows | Consist of thousands of unusually large cilia |
| Mouth and pharynx | Have well-developed muscles |
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What You'll Learn
- Ctenophores have a type of muscle that arises from the middle cell layer in more complex animals
- The comb rows in ctenophores are made up of comb-like bands of cilia called ctenes
- The ciliary rosettes in the canals may help transport nutrients to muscles in the mesoglea
- The inner layer of the epidermis contains myoepithelial cells that act as muscles
- The mouth and pharynx of ctenophores have well-developed muscles
Ctenophores have a type of muscle that arises from the middle cell layer in more complex animals
Ctenophores, or comb jellies, are marine invertebrates that constitute the phylum Ctenophora. They have two main layers of cells that sandwich a middle layer of jelly-like material called the mesoglea. This mesoglea contains muscle cells, which allow ctenophores to close their mouths and perform muscular contractions of the pharynx.
The inner layer of the epidermis, or outer skin, of ctenophores contains myoepithelial cells that act as muscles. These muscles enable the ctenophore to close its mouth, which is part of the internal cavity formed by the epidermis. The internal cavity also includes a pharynx (throat), a wider area in the center that acts as a stomach, and a system of internal canals.
The presence of muscle cells in the mesoglea and myoepithelial cells in the epidermis contributes to the classification of ctenophores as triploblastic by some recent textbooks. This classification considers the muscle cells in the middle layer of the ctenophore as analogous to those found in more complex animals with three main cell layers. However, other textbooks still regard ctenophores as diploblastic, emphasizing their two main layers of cells with a jelly-like middle layer.
The muscles in the mesoglea may also play a role in transporting nutrients to the ctenophore's muscles and adjusting the animal's buoyancy by pumping water into or out of the mesoglea. Additionally, the muscular contractions of the pharynx aid in liquefying swallowed prey, which is then digested by nutritive cells.
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The comb rows in ctenophores are made up of comb-like bands of cilia called ctenes
Ctenophores, also known as comb jellies, are the largest non-colonial animals that use cilia as their main method of locomotion. They have eight strips, called comb rows, that run the length of their bodies. These comb rows bear comb-like bands of cilia, called ctenes. The ctenes are stacked along the comb rows so that when the cilia beat, each one touches the comb below it. The beating of the cilia allows ctenophores to move through the water.
Ctenophores have a wide range of cell types, with over 80 different kinds. The outer layer of the epidermis consists of sensory cells, mucus-secreting cells, and interstitial cells, which can transform into other types of cells. The inner layer of the epidermis contains a nerve net and myoepithelial cells that act as muscles. The internal cavity forms a mouth, a pharynx, a central area that acts as a stomach, and a system of internal canals.
The mouth, pharynx, and other parts of the canal system are lined with cilia and well-developed muscles. The cilia circulate water through the canals, while the muscles help with functions such as swallowing and digestion. The ciliary rosettes in the canals may also play a role in transporting nutrients to the muscles in the mesoglea, the layer of tissue between the epidermis and the internal cavity.
In summary, the comb rows in ctenophores are indeed made up of comb-like bands of cilia called ctenes, with each ctene consisting of thousands of cilia. These ctenes are crucial for the locomotion of ctenophores, allowing them to move through the water with ease.
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The ciliary rosettes in the canals may help transport nutrients to muscles in the mesoglea
The ciliary rosettes in the canals may play a role in transporting nutrients to muscles in the mesoglea of ctenophores. Ctenophores, also known as comb jellies, are the largest non-colonial animals that use cilia as their primary means of locomotion. They possess a unique body structure, with two main layers of cells sandwiching a middle layer of jelly-like mesoglea.
The ciliary rosettes are an important component of the ctenophore's canal system. These rosettes are found in the gastrodermis, which lines the inner surface of the internal cavity. The gastrodermis is composed of two distinct sides, each serving different functions. The side nearest to the organ it supplies is made up of tall nutritive cells, germ cells, and photocytes, while the side furthest from the organ is covered with ciliated cells that facilitate water circulation through the canals.
The ciliated cells and their rosettes play a crucial role in nutrient transport. The ciliary rosettes connect to the mesoglea, allowing them to distribute nutrients to the muscles within this jelly-like layer. Additionally, the rosettes may aid in removing waste products from the mesoglea and adjusting the animal's buoyancy by pumping water in or out. This buoyancy regulation is essential for ctenophores to adapt to water of varying densities.
The ciliary rosettes are not the only structures involved in nutrient transport and muscle function in ctenophores. The mouth and pharynx, for instance, are equipped with well-developed muscles and cilia. When prey is ingested, muscular contractions in the pharynx, along with enzymes, liquefy it. The resulting slurry is then propelled through the canal system by the beating of cilia and digested by nutritive cells.
In summary, the ciliary rosettes in the canals of ctenophores likely contribute to the transport of nutrients to the muscles in the mesoglea. They also assist in waste removal and buoyancy control, demonstrating the versatility and importance of these structures in the overall functioning of ctenophores.
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The inner layer of the epidermis contains myoepithelial cells that act as muscles
The epidermis is the top or outermost layer of the skin. It is composed of four or five layers of epithelial cells, depending on its location in the body. The epidermis is made of closely packed epithelial cells and is attached to the deeper layer of the skin, the dermis. The dermis is well-vascularized and has numerous sensory, autonomic, and sympathetic nerve fibers.
The inner layer of the epidermis forms an internal cavity that includes a mouth, a pharynx or throat, a wider area that acts as a stomach, and a system of internal canals. The mouth can usually be closed by muscles, and the pharynx has well-developed muscles. The internal canals branch through the mesoglea to the most active parts of the animal, including the mouth, pharynx, and roots of the tentacles.
Ctenophores (or comb jellies) are the largest non-colonial animals that use cilia as their main method of locomotion. They have a type of muscle that, in more complex animals, arises from the middle cell layer. This has led to some disagreement in recent textbooks over whether ctenophores should be classified as diploblastic or triploblastic.
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The mouth and pharynx of ctenophores have well-developed muscles
The mouth and pharynx of ctenophores, also known as "comb jellies" or "sea walnuts", have well-developed muscles. Ctenophores are a group of marine plankton animals that use cilia as their main method of locomotion. They have a thick, jelly-like mesoglea sandwiched between two layers of cells, or epithelia, which are bound by inter-cell connections and a fibrous basement membrane.
The inner layer of the epidermis contains a nerve net and myoepithelial cells that act as muscles. The internal cavity forms a mouth that can usually be closed by muscles, a pharynx (throat), a wider area in the centre that acts as a stomach, and a system of internal canals. The mouth and pharynx have both cilia and well-developed muscles. The pharynx is lined with epidermis and opens into a small but wide stomach.
When prey is swallowed, it is liquefied in the pharynx by enzymes and muscular contractions. The resulting slurry is then digested by nutritive cells and transported through the canals by the cilia. The ciliary rosettes in the canals may also help to transport nutrients to muscles in the mesoglea. The nervous system of ctenophores controls muscular movements and the activity of cilia on the comb rows.
The mouth of a ctenophore is situated at one end, or the "oral pole", with a sense organ at the opposite end, or the "aboral pole". The comb rows, or "swimming plates", are oriented to run from near the mouth to the aboral pole. The Beroida, or Nuda, are ctenophores that have no feeding appendages but a large pharynx just inside the mouth. The pharynges of Platyctenida are used as suckers to attach themselves to surfaces.
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Frequently asked questions
The ctenophores have a type of muscle that, in more complex animals, arises from the middle cell layer. The mouth and pharynx of ctenophores have well-developed muscles.
Ctene, or ctene rows, are the eight longitudinal rows of comb plates in ctenophores that are used for locomotion.
Ctenophores are the largest non-colonial animals that use cilia as their main method of locomotion. They range from about 1 millimeter to 1.5 meters in size.
