Evolutionary Origin of Sensory and Neurosecretory Cell Types: Vertebrate Cranial Placodes, volume 2

Placodes and sensory structures in vertebrates' heads originate from ancestral developmental pathways, which are co-opted to create novel cell types and functions. These cells share common features with other ectoderm types but undergo changes during evolution.

\n Format: Hardback
\n Length: 311 pages
\n Publication date: 18 June 2021
\n Publisher: Taylor & Francis Ltd
\n

The development of placodes and sensory structures in the head of vertebrates is a fascinating topic that has been studied for many years. These structures are essential for the perception and processing of sensory information, and they play a crucial role in the evolution of vertebrates. In this article, we will explore the evolutionary origin of placodes and sensory structures in the head of vertebrates, illustrate the ways ancestral developmental pathways are co-opted to create novel cell types and new functions, explore the common features that distinguish placodal sensory and neurosecretory cells from other types of ectoderm, and document changes in placodes during the evolution of vertebrates.

The evolution of placodes and sensory structures in the head of vertebrates is a complex process that has been studied for many years. The first placodes to emerge in vertebrates were the otic placodes, which are responsible for the development of the ear and the inner ear. These placodes are derived from the ectoderm, which is the outer layer of the embryo. The otic placodes are divided into three main regions: the vestibular region, the auditory region, and the facial region. The vestibular region is responsible for the development of the vestibular system, which is responsible for balance and orientation. The auditory region is responsible for the development of the auditory system, which is responsible for hearing and sound perception. The facial region is responsible for the development of the facial muscles and the facial nerves.

The otic placodes are just one example of the many types of placodes that emerge in vertebrates. Other placodes include the optic placodes, which are responsible for the development of the eye, and the rhombencephalic placodes, which are responsible for the development of the brain. These placodes are derived from different regions of the ectoderm and have different functions. For example, the optic placodes are derived from the neural crest, which is a group of cells that migrate from the ectoderm to the underlying mesoderm during embryogenesis. The rhombencephalic placodes are derived from the ectoderm and the underlying mesoderm.

The development of placodes and sensory structures in the head of vertebrates is a complex process that involves the co-opting of ancestral developmental pathways. For example, the optic placodes are derived from the neural crest, which is a group of cells that migrate from the ectoderm to the underlying mesoderm during embryogenesis. The neural crest is also responsible for the development of other structures in the head, such as the teeth and the jaw. The co-opting of ancestral developmental pathways allows for the creation of novel cell types and new functions. For example, the optic placodes can be co-opted to create new cell types that are responsible for the development of the retina and the optic nerve.

The common features that distinguish placodal sensory and neurosecretory cells from other types of ectoderm are their location and their function. Placodal sensory and neurosecretory cells are located in the ectoderm of the head and neck region of vertebrates. They are responsible for the perception and processing of sensory information, such as sound, light, and touch. Placodal sensory and neurosecretory cells are also responsible for the secretion of hormones and neurotransmitters, which are essential for the regulation of behavior and the development of the nervous system.

Changes in placodes during the evolution of vertebrates are an important topic of study. For example, the evolution of the ear has been studied for many years. The ear of modern vertebrates is derived from the otic placodes, which emerged in the early stages of vertebrate evolution. The ear of modern vertebrates is much more complex than the ear of early vertebrates, which was a simple structure that was used for hearing and balance. The evolution of the ear has been influenced by a number of factors, including the environment and the evolution of other structures in the head.

In conclusion, the development of placodes and sensory structures in the head of vertebrates is a fascinating topic that has been studied for many years. The evolution of these structures is a complex process that involves the co-opting of ancestral developmental pathways and the creation of novel cell types and new functions. The common features that distinguish placodal sensory and neurosecretory cells from other types of ectoderm are their location and their function. Changes in placodes during the evolution of vertebrates are an important topic of study, and they provide insight into the evolution of the nervous system and the behavior of vertebrates.

\n Weight: 670g\n
Dimension: 160 x 243 x 22 (mm)\n
ISBN-13: 9780367748524\n \n