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Postnatal development of the vestibular aqueduct and endolymphatic sac. 1982

A Kodama, and I Sando

The purpose of this study was to gain basic information about the postnatal development of the vestibular aqueduct (VA) and the endolymphatic sac (ES). For this study, serial horizontal sections of 31 normal temporal bones of individuals whose ages ranged from 0 to 13 years were used. Medial view graphic reconstruction of the VA and rugose portion (RP) of the ES was performed in every case for analysis of the VA and RP. The findings of this study revealed the following new information about the postnatal development of the VA and ES. 1) The VA and RP undergo significant growth postnatally up to age 3 years. 2) In the newborn, individual variations in the VA and RP already exist and at age 3 years significantly wide individual variations which can be classified into three groups (hypoplastic, normoplastic, hyperplastic) may be recognized. 3) Hypoplastic VAs are of two types: one is fairly elongated and tubelike while the other is short and funnel-shaped. The tubelike VA seems to be the prenatal form. 4) The changes that occur with development postnatally in the area of the VA are more closely related to the changes that occur in the length of the external aperture of the VA than they are to the changes that occur in the length of the VA. 5) Development of the area of the VA is closely correlated with development of the area of the RP.

UI MeSH Term Description Entries
D006965 Hyperplasia An increase in the number of cells in a tissue or organ without tumor formation. It differs from HYPERTROPHY, which is an increase in bulk without an increase in the number of cells. Hyperplasias
D007223 Infant A child between 1 and 23 months of age. Infants
D007231 Infant, Newborn An infant during the first 28 days after birth. Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D007758 Ear, Inner The essential part of the hearing organ consists of two labyrinthine compartments: the bony labyrinthine and the membranous labyrinth. The bony labyrinth is a complex of three interconnecting cavities or spaces (COCHLEA; VESTIBULAR LABYRINTH; and SEMICIRCULAR CANALS) in the TEMPORAL BONE. Within the bony labyrinth lies the membranous labyrinth which is a complex of sacs and tubules (COCHLEAR DUCT; SACCULE AND UTRICLE; and SEMICIRCULAR DUCTS) forming a continuous space enclosed by EPITHELIUM and connective tissue. These spaces are filled with LABYRINTHINE FLUIDS of various compositions. Labyrinth,Bony Labyrinth,Ear, Internal,Inner Ear,Membranous Labyrinth,Bony Labyrinths,Ears, Inner,Ears, Internal,Inner Ears,Internal Ear,Internal Ears,Labyrinth, Bony,Labyrinth, Membranous,Labyrinths,Labyrinths, Bony,Labyrinths, Membranous,Membranous Labyrinths
D002648 Child A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL. Children
D002675 Child, Preschool A child between the ages of 2 and 5. Children, Preschool,Preschool Child,Preschool Children
D003388 Cranial Fossa, Posterior The infratentorial compartment that contains the CEREBELLUM and BRAIN STEM. It is formed by the posterior third of the superior surface of the body of the sphenoid (SPHENOID BONE), by the occipital, the petrous, and mastoid portions of the TEMPORAL BONE, and the posterior inferior angle of the PARIETAL BONE. Clivus,Cranial Fossas, Posterior,Fossa, Posterior Cranial,Fossas, Posterior Cranial,Posterior Cranial Fossa,Posterior Cranial Fossas
D004712 Endolymphatic Sac The blind pouch at the end of the endolymphatic duct. It is a storage reservoir for excess ENDOLYMPH, formed by the blood vessels in the membranous labyrinth. Endolymphatic Sacs,Sac, Endolymphatic,Sacs, Endolymphatic
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000293 Adolescent A person 13 to 18 years of age. Adolescence,Youth,Adolescents,Adolescents, Female,Adolescents, Male,Teenagers,Teens,Adolescent, Female,Adolescent, Male,Female Adolescent,Female Adolescents,Male Adolescent,Male Adolescents,Teen,Teenager,Youths

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