What does the endostyle secrete?

The endostyle is a longitudinal, ciliated, grooved organ on the ventral wall of the pharynx that secretes mucoproteins into the alimentary canal for filter feeding (Fig. 7.8).

What does the endostyle secrete?

The endostyle is a longitudinal, ciliated, grooved organ on the ventral wall of the pharynx that secretes mucoproteins into the alimentary canal for filter feeding (Fig. 7.8).

What does endostyle become?

The endostyle in larval lampreys (ammocetes) metamorphoses into the thyroid gland in adults, and is regarded as being homologous to the thyroid gland in vertebrates.

What is the notochord?

The notochord is an embryonic midline structure common to all members of the phylum Chordata, providing both mechanical and signaling cues to the developing embryo. In vertebrates, the notochord arises from the dorsal organizer and it is critical for proper vertebrate development.

Which organisms have a notochord?

At some point, all of the organisms in this phylum have a structure called a notochord. A notochord is a flexible rod-like cord of cells that provides the main support for the organism’s body during its embryonic stage.

What is endostyle in Branchiostoma?

The asymmetrical endostyle of Branchiostoma larvae contains two different zones of mucus-producing cells which metamorphose to the paired zones 2 and 4 respectively in the endostyle of the adult. In both the larva and the adult these zones are parts of the food-trapping mechanism.

What is absent in Branchiostoma?

So, the correct answer is ‘Head’.

What is the importance of the notochord in the development of the Neurula?

The notochord forms during gastrulation and soon after induces the formation of the neural plate (neurulation), synchronizing the development of the neural tube. On the ventral aspect of the neural groove an axial thickening of the endoderm takes place.

Why is the notochord important?

The notochord is the defining structure of the chordates, and has essential roles in vertebrate development. It serves as a source of midline signals that pattern surrounding tissues and as a major skeletal element of the developing embryo.

What organisms possess Notochords throughout their lives?

The animal having notochord throughout life is Amphioxus (Cephalochordata).

What is the primary function of the notochord?

What is the importance of endostyle in Lancelets and Ascidians?

The endostyle of Lanceletes (Amphioxus) and Ascidians secretes mucus which helps to gather the food particles scattered in water. It is a ciliated glandular groove present on the floor of the pharynx.

What is the common name of Branchiostoma?

Common lancelet
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What is Branchiostoma nervous system?

The nervous system of Branchiostoma consists of a hollow dorsal nerve cord situated just above the notochord. The anterior part of the nerve tube is slightly dilated to form the brain and the posterior part remains as the spinal cord. The nerve tube gives paired nerves in each segment of the body.

What is the mode of feeding of Branchiostoma?

Branchiostoma feeds on micro-organisms brought into the pharyngeal cavity together with the respiratory water current. It exhibits a typical instance of ciliary mode of feeding. 3. External Structures of Branchiostoma:

What is Branchiostoma 1111?

11. Nervous System of Branchiostoma: The nervous system of Branchiostoma consists of a hollow dorsal nerve cord situated just above the notochord. The anterior part of the nerve tube is slightly dilated to form the brain and the posterior part remains as the spinal cord.

What is the histological structure of the endostyle of Branchiostoma?

The histological structure of endostyle of Branchiostoma (Fig. 3.15 C) similar to that of Ascidia in which the structure of the organ has been discussed in detail. The endostyle consists of a few tracts of ciliated cells alternating with mucus-secreting glandular bands (Fig. 3.15 C).