What is Auditory Pit?

Embryology is the study of the development of an embryo. An embryo is defined as any vertebrate in a stage before birth or hatching. Embryology refers to the development of the egg cell (zygote) after fertilization and the differentiation of cells into tissues and organs.
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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The inner ear is the bony labyrinth, a system of passages comprising two main functional parts:

• the organ of hearing, or cochlea
• and the vestibular apparatus, the organ of balance that consists of three semicircular canals and the vestibule.

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The rhombencephalon (or hindbrain) is a developmental categorization of portions of the central nervous system in vertebrates.

The rhombencephalon can be subdivided in a variable number of transversal swellings called rhombomeres.
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University of North Carolina at Chapel Hill is a public, coeducational, research university located in Chapel Hill, North Carolina, United States. Also known as The University of North Carolina, Carolina, North Carolina, or simply UNC
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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Prenatal development is the process in which an embryo or fetus (or foetus) gestates during pregnancy, from fertilization until birth. Often, the terms fetal development, foetal development, or embryology are used in a similar sense.
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Mammalian embryogenesis is the process of cell division and cellular differentiation during early prenatal development which leads to the development of a mammalian embryo.
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Embryology is the study of the development of an embryo. An embryo is defined as any vertebrate in a stage before birth or hatching. Embryology refers to the development of the egg cell (zygote) after fertilization and the differentiation of cells into tissues and organs.
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nervous system of an animal coordinates the activity of the muscles, monitors the organs, constructs and also stops input from the senses, and initiates actions. Prominent parts of a nervous system include neurons and nerves, which are used in coordination.
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The study of neural development draws on both neuroscience and developmental biology to describe the cellular and molecular mechanisms by which complex nervous systems emerge during embryonic development and throughout life.
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Neurulation is a part of organogenesis in vertebrate embryos. Steps of neurulation include the formation of the dorsal nerve cord, and the eventual formation of the central nervous system.
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A Neurula is an embryo at the early stage of development in which neurulation occurs.

Neurulation is the development of the nervous system in the embryo, at the thickened area above the notochord in ectoderms.
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The notochord is a flexible, rod-shaped body found in embryos of all chordates. It is composed of cells derived from the mesoderm and defines the primitive axis of the embryo.
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neural folds; they commence some little distance behind the anterior end of the embryonic disk, where they are continuous with each other, and from there gradually extend backward, one on either side of the anterior end of the primitive streak.
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Neuroectoderm (or neural ectoderm) is the term for ectoderm which receives inhibitory signals from proteins such as noggin, which leads to the development of the nervous system from this tissue.
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In human embryology, formation of neural plate is the first step of neurulation. It is created by a flat thickening opposite to the primitive streak.

As it develops, it becomes surrounded by neural folds, which eventually create the cylindrical neural tube.
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Between the neural folds is a shallow median groove, the neural groove. The groove gradually deepens as the neural folds become elevated, and ultimately the folds meet and coalesce in the middle line and convert the groove into a closed tube, the neural tube or canal, the
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The neural crest, a transient component of the ectoderm, is located in between the neural tube and the epidermis (or the free margins of the neural folds) of an embryo during neural tube formation.
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neural tube is the embryo's precursor to the central nervous system, which comprises the brain and spinal cord. The neural groove gradually deepens as the neural folds become elevated, and ultimately the folds meet and coalesce in the middle line and convert the groove into a
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Neuromeres are transient segments during the early development of the human brain. Around the fifth week of biological development, there are 15 visible neuromeres.


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In the vertebrate embryo, a rhombomere is a transiently divided segment of the developing neural tube (a neuromere) in the area that will eventually become the rhombencephalon.
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The cephalic flexure is the first flexure, or bend, of the embryonic brain; it appears in the region of the mid-brain.

By means of it the fore-brain is bent in a ventral direction around the anterior end of the notochord and fore-gut, with the result that the floor of the
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The eye develops from the neural tube, the epidermis, and the periocular mesenchyme, which receives contributions from both the neural crest and mesoderm lineages.

Sequential inductions

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optic vesicles.

They project toward the sides of the head, and the peripheral part of each expands to form a hollow bulb, while the proximal part remains narrow and constitutes the optic stalk.
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optic stalk.

External links

• Embryology at UNC eye-012
• Overview at vision.ca

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated.
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Optic cup can refer to:

• Optic cup (embryology)
• Optic cup (ophthalmology)

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The mouth of the auditory pit is then closed, and thus a shut sac, the auditory vesicle (or otic vesicle^[1]), is formed; from it the epithelial lining of the membranous labyrinth is derived.
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