関: transitional epithelium

WordNet

make or undergo a transition (from one state or system to another); "The airline transitioned to more fuel-efficient jets"; "The adagio transitioned into an allegro"
a musical passage moving from one key to another (同)modulation
a change from one place or state or subject or stage to another
a passage that connects a topic to one that follows
cause to convert or undergo a transition; "the company had to transition the old practices to modern technology"
of or relating to or characterized by transition; "adolescence is a transitional stage between childhood and adulthood"

PrepTutorEJDIC

(…から…へ)移り変わること,変遷;(…から…への)過渡期《+from+名+to+名》
移り変わりの,過渡期の

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/10/07 06:23:25」(JST)

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Transitional epithelium (also known as urothelium) is a type of tissue consisting of multiple layers of epithelial cells which can contract and expand. These cells, part of the epithelium, are found in the urinary bladder, in the ureters, and in the superior urethra and gland ducts of the prostate.

Appearance

These cells appear to be cuboidal with a domed apex when the organ or the tube in which they reside is not stretched. When the bladder fills, the tissue actually compresses and the cells become stretched, and they appear to be flat, irregular, and squamous.

Functions

The transitional epithelium cells accommodate fluctuation of volume of the liquid in an organ or tube, such as the urinary bladder, and protect against the caustic effects of urine. Location : urinary bladder, kidneys, ureters, parts of urethra

Surfaces

The free surface of the tissue (the part that faces outward into the organ or tube) is called the apical surface or free surface.

The part that lines the bottom of the tissue is called the basement membrane.

Gallery

Types of epithelium
Schematic view of transitional epithelium
Vertical section of bladder wall.

External links

Histology at utmb.edu
Histology at OU 36_02 - "ureter"
Histology at OU 37_02 - "urinary bladder"
Anatomy Atlases - Microscopic Anatomy, plate 02.24 - "Transitional Epithelium", Ureter
Histology at KUMC urinary-renal16 "ureter"

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Japanese Journal

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関連記事	「transition」「transitional」「epithelia」

「transition」

Transitional epithelium
	Transitional epithelium of the urinary bladder. Note the rounded surface of the apical cells -- a distinguishing characteristic of this type of epithelium.
	Transverse section of ureter.
Code	TH H2.00.02.0.02033