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✅ EMBRIOLOGÍA del OÍDO (Interno, Medio y Externo)👂🏻🦜
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✅ EMBRIOLOGÍA del OÍDO (Interno, Medio y Externo)👂🏻🦜

Introduction

The video introduces the topic of ear embryology and discusses the three parts of the ear in both adults and embryos.

Ear Anatomy

  • The adult ear consists of three main parts: the external ear, middle ear, and inner ear.
  • In embryos, the ear develops from three distinct parts: the external ear, middle ear, and inner ear.
  • The external ear captures sounds.
  • The middle ear conducts sound from the outer to the inner ear.
  • The inner ear converts sound waves into nerve impulses and records balance changes.

Internal Ear Development

This section focuses on the development of the internal ear in embryos.

Early Development

  • At approximately 22 days in embryos, thickening of the superficial ectoderm on both sides of the hindbrain indicates the developing ears.
  • These thickenings are called otic placodes or auditory vesicles.
  • Otic vesicles invaginate to form otic or auditory vesicles (otocysts).
  • Cells within otocysts differentiate into ganglion cells to form statoacoustic ganglia.

Further Development

  • During further development, each otic vesicle is divided into ventral and dorsal components.
  • The ventral component gives rise to sacules and cochlear ducts.
  • The dorsal component forms utricles, semicircular canals, and endolymphatic ducts.
  • These epithelial structures together produce membranous labyrinth.

Saculum, Cochlea, and Organ of Corti Development

This section discusses the development of saculum, cochlea, and organ of Corti during embryonic stages.

Formation of Cochlear Duct

  • In the 6th week of development, the saculum forms a tubular evagination at its bottom known as the cochlear duct.
  • The cochlear duct spirally penetrates the surrounding mesenchyme until completing 2.5 laps by the end of the 8th week.

Spiral Organ of Corti

  • In the 7th week, cells within the cochlear duct differentiate into spiral organ of Corti.
  • The spiral organ of Corti converts sound vibrations into electrical signals for hearing.
  • Hensen's conduit remains as a narrow channel connecting the cochlear duct and remaining part of the sacule.

Cartilaginous Shell and Membranes

  • Mesenchyme surrounding the cochlear duct differentiates into cartilage.
  • In the 10th week, this cartilaginous shell undergoes vacuolization.
  • Perilymphatic spaces appear: tympanic ramp and vestibular ramp.
  • Vestibular membrane separates cochlear duct from vestibular ramp, while basilar membrane separates it from tympanic ramp.

Spiral Ligament and Modiolo

  • The side wall of the cochlear duct is attached to surrounding cartilage through spiral ligament.
  • The middle angle is connected to a long cartilaginous process called modiolo, which forms the axis of bone cochlea.

Organ of Corti

  • Cochlear duct epithelial cells differentiate into inner edge (future spiral limbus) and outer edge.
  • Outer edge produces inner row and outer rows of hair cells known as sensitive cells of auditory system.
  • Hair cells are covered by tectorial membrane, a gelatinous substance attached to spiral limbus.
  • Sensory cells along with tectorial membrane constitute organ of Corti.

Utricle and Semicircular Canals Development

This section focuses on the development of utricle and semicircular canals during embryonic stages.

Development of Semicircular Canals

  • During the 6th week of development, semicircular canals appear as flattened evaginations in the utricular part of the otic vesicle.

The transcript ends here.

Ear Embryology

This section provides an overview of the embryology of the ear, discussing its development from three differentiated parts: the external ear, middle ear, and inner ear.

Development of the Ear

  • The ear develops from three well-differentiated parts:
  • External Ear
  • Middle Ear
  • Inner Ear
  • The External Ear captures sounds.
  • The Middle Ear conducts sound from the outer to the inner ear.
  • The Inner Ear converts sound waves into nerve impulses and records balance changes.

Internal Ear Development

  • The internal ear starts developing around day 22 in embryos.
  • Thickening of the superficial ectoderm on both sides of the hindbrain forms placodas óticas.
  • Placodas invaginate to form otic or auditory vesicles (otocistos).
  • Ganglion cells differentiate to form statoacoustic ganglia.

Differentiation of Gallbladder Components

  • Each gallbladder is divided into:
  • Ventral component: Gives rise to sacules and cochlear duct.
  • Dorsal component: Forms utricle, semicircular canals, and endolymphatic duct.

Formation of Membranous Labyrinth

  • Epithelial structures are put together to produce the membranous labyrinth.

Saculum, Cochlea, and Organ of Corti Development

  • In the 6th week of development, saculum forms a tubular evagination at its bottom known as cochlear duct.
  • Cochlear duct spirally penetrates surrounding mesentery until completing 2.5 laps by the end of the 8th week.
  • Duct cells differentiate into spiral organ of Corti that converts sound vibrations into electrical signals for hearing.

Utricle and Semicircular Canals Development

  • During the 6th week of development, semicircular canals appear as flattened evaginations in the utricular part of the otic vesicle.
  • Central parts of the walls of the evaginations unite and disappear, giving rise to three semicircular ducts.

External Ear

This section focuses on the external ear, which is responsible for capturing sounds.

Function of External Ear

  • The external ear is an organ that captures sounds.

Inner Ear

This section discusses the inner ear, which converts sound waves into nerve impulses and records balance changes.

Function of Inner Ear

  • The inner ear converts sound waves into nerve impulses.
  • It also records balance changes.

Middle Ear

This section explains the role of the middle ear as a conductor of sound from the outer to the inner ear.

Function of Middle Ear

  • The middle ear is a conductor of sound from the outer to the inner ear.

Introduction to Internal Ear

This section introduces and provides an overview of the internal ear's development.

Internal Ear Development

  • The internal ear starts developing around day 22 in embryos.
  • Thickening of superficial ectoderm forms placodas óticas.
  • Placodas invaginate to form otic or auditory vesicles (otocistos).
  • Ganglion cells differentiate to form statoacoustic ganglia.

Anatomy of the Inner Ear

This section provides an overview of the anatomy of the inner ear, including the formation of ampullary and non-ampullary branches, as well as the development of sensory cells for balance.

Formation of Ampullary and Non-Ampullary Branches

  • The non-ampullary branch forms three semicircular canals, while one end of each canal dilates to produce the ampullar branch.
  • The ampullar branch contains sensory cells in a structure called the Ampullar Crest.
  • The non-ampullary branch does not dilate and forms the Non-Ampullar Crest.

Sensory Cells for Balance

  • Sensory cells for maintaining balance are found in both the Ampullar Crest and other similar areas called Acoustic Maculae.
  • Acoustic Maculae develop in the walls of Utricle and Saccule.
  • When the body changes position, vestibular fibers transmit impulses generated by sensory cells to maintain balance.

Development of Ganglion Cells

This section discusses the development of ganglion cells in relation to the formation of otic vesicle and ganglia division.

Formation of Otic Vesicle

  • A small group of cells detach from the wall during otic vesicle formation.
  • These detached cells form the statoacoustic ganglion.
  • Other ganglion cells originate from neural crest crests.

Division into Cochlear and Vestibular Parts

  • The statoacoustic ganglion divides into cochlear and vestibular parts.
  • These parts innervate sensory cells in Corti's Organ, Saccule, Utricle, and Semilunar Canals respectively.

Development of the Middle Ear

This section focuses on the development of the middle ear, including the formation of the tympanic cavity, auditory tube, and ossicles.

Formation of Tympanic Cavity and Auditory Tube

  • The tympanic cavity originates from endoderm and the first pharyngeal pouch.
  • The expanding part of the pouch forms the primitive tympanic cavity.
  • The narrow part forms the auditory tube or Eustachian tube, connecting the tympanic cavity to the nasopharynx.

Development of Ossicles

  • The malleus and incus originate from cartilage in the first pharyngeal arch.
  • The stapes develops from cartilage in the second arch.
  • These ossicles remain embedded in mesenchyme until around 8 months when surrounding tissue dissolves.

Development of External Ear

This section discusses the development of external ear, specifically focusing on the formation of external auditory canal and eardrum.

Formation of External Auditory Canal

  • The external auditory canal develops from dorsal portion of the first pharyngeal cleft.
  • Epithelial zones in this region proliferate to form a solid epithelial plate called Meatal Plug.
  • In the 7th month, Meatal Plug dissolves, allowing for further development.

Formation of Eardrum

  • Epithelial lining at the floor of external auditory canal contributes to forming a definitive eardrum.

Desarrollo del Oído Externo

Esta sección describe el desarrollo del oído externo, incluyendo el tímpano y el pabellón auricular.

El Tímpano

  • El tímpano consta de tres partes:
  • Revestimiento epitelial ectodérmico en el fondo del conducto auditivo.
  • Revestimiento epitelial endodérmico de la cavidad timpánica.
  • Capa intermedia del tejido conectivo que forma el estrato fibroso.
  • La mayor parte del tímpano está unida al mango del martillo, mientras que una parte separa el conducto auditivo externo y la cavidad timpánica.

Desarrollo del Pabellón Auricular

  • El pabellón auricular se desarrolla a partir de seis proliferaciones mesenquimatosas en los extremos dorsales del primer y segundo arco faríngeo, rodeando la primera hendidura faríngea.
  • Estas prominencias, conocidas como montículos auriculares, se fusionan para formar el pabellón auricular definitivo.
  • Las anomalías en el desarrollo del pabellón auricular son frecuentes debido a la complejidad de la formación y fusión de los montículos.
  • Estas anomalías pueden estar asociadas con malformaciones en otros órganos derivados de las células de la cresta neural, como defectos faciales, craneales y cardíacos.

Desplazamiento del Oído Externo

  • Inicialmente, los oídos externos se localizan en la región inferior del cuello.
  • Sin embargo, el crecimiento posterior y craneal de la mandíbula desplaza los oídos a un lado de la cabeza, a nivel de los ojos.
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Video description

Breve, Práctico y Sencillo. ✅ Aprende los CONCEPTOS BÁSICOS DE LA EMBRIOLOGÍA DEL OÍDO de una manera fácil, rápida y concisa. #EmbriologíaLangman #Fonoaudiologia #Medicina #Veterinaria #Kinesiologia #Biologia ⌚Marcas de tiempo: 0:00 Bienvenida e Introducción 0:37 Oído Interno 5:37 Oído Medio 7:53 Oído Externo —————————————————————————————— 🚀Lista de reproducción "EMBRIOLOGÍA HUMANA 👶 ✅" ● https://bit.ly/EmbriologiaHumana —————————————————————————————— 🤩Suscribete en el link de abajo 👇 : ● https://bit.ly/VideosMedicina —————————————————————————————— 👨‍💼Contacto comercial ● francokellytb@gmail.com —————————————————————————————— 💰 Donaciones (Apoyo para mejorar mi contenido): ● https://bit.ly/YoApoyoTuCanal —————————————————————————————— 🙏GRACIAS POR VER MIS VÍDEOS🙏 RESUMEN El oído está constituido por tres partes, que tienen orígenes distintos pero que funcionan como una unidad. El oído interno se origina a partir de la vesícula ótica, que durante la cuarta semana de desarrollo se desprende del ectodermo superficial. Esta vesícula forma el otocisto que se divide en un componente ventral, que da origen al sáculo y al conducto coclear, y un componente dorsal, que genera el utrículo, los conductos semicirculares membranosos y el conducto endolinfático. Las estructuras epiteliales que se forman de este modo se conocen de manera colectiva como laberinto. membranoso. Excepto por el conducto coclear, que forma el órgano de Corti, todas las estructuras que derivan del laberinto membranoso están implicadas en el equilibrio. El oído medio, que está integrado por la caja timpánica y la trompa de Eustaquio, está cubierto por el epitelio de origen endodérmico y deriva de la primera bolsa faríngea. La trompa de Eustaquio se extiende entre la caja timpánica y la nasofaringe. Los huesecillos, que transmiten el sonido desde la membrana timpánica hasta la ventana oval, derivan del primer arco (martillo y yunque) y del segundo arco (estribo) faríngeos. El conducto auditivo externo se desarrolla a partir del primer arco faríngeo a manera de invaginación del ectodermo y se separa de la cavidad timpánica por medio de la membrana timpánica (tímpano). El tímpano está constituido por (1) una cubierta de ectodermo superficial, (2) una capa intermedia de mesénquima y (3) un revestimiento endodérmico derivado de la primera bolsa faríngea. El pabellón auricular se desarrolla a partir de seis protuberancias mesenquimatosas, que surgen a lo largo del primer y el segundo arcos faríngeos. Los defectos del pabellón auricular a menudo se relacionan con otras malformaciones congénitas. Bibliografía: - Embriología Langman 13era edición - Embriología Moore 8va edicion - Embriologia humana y biologia del desarrollo Carlson 4ta edicion —————————————————————————————— videos de embriologia, videos de embriologia humana en español , videos de embarazo, videos embriologia langman, embriologia videos explicativos, videos sobre embriologia video embriologia, videos de embriologia humana, videos aulas de embriologia, embriologia humana pdf, embriologia humana y biologia del desarrollo pdf, embriologia humana, embriologia y biologia del desarrollo, embriologia humana etapas, embriologia humana flores pdf, embriologia humana video, inicio vida humana embriologia, embrion video, embriologia del corazon video, embriologia del ojo, embriologia del desarrollo, embriologia humana facil