umbilical vesicle

vesicle /ves·i·cle/ (ves´ĭ-k'l)

1. a small bladder or sac containing liquid.

2. a small circumscribed elevation of the epidermis containing a serous fluid; a small blister.

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acrosomal vesicle  a membrane-bounded vacuolelike structure which spreads over the upper two-thirds of the head of a spermatozoon to form the head cap.

auditory vesicle  otic v.

blastodermic vesicle  blastocyst.

brain vesicles , cephalic vesicles, cerebral vesicles the five divisions of the closed neural tube in the head of the developing embryo, including the telencephalon, diencephalon, mesencephalon, metencephalon, and myelencephalon.

chorionic vesicle  see under sac.

encephalic vesicles  brain v's.

germinal vesicle  the fluid-filled nucleus of an oocyte toward the end of prophase of its first meiotic division.

lens vesicle  a vesicle formed from the lens pit of the embryo, developing into the crystalline lens.

matrix vesicles  small membrane-limited structures at sites of calcification of the cartilage matrix.

olfactory vesicle 

1. the vesicle in the embryo that later develops into the olfactory bulb and tract.

2. a bulbous expansion at the distal end of an olfactory cell, from which the olfactory hairs project.

optic vesicle  an evagination on either side of the forebrain of the early embryo, from which the percipient parts of the eye develop.

otic vesicle  a detached ovoid sac formed by closure of the otic pit in embryonic development of the external ear.

primary brain vesicles  the three earliest subdivisions of the embryonic neural tube, including the prosencephalon, mesencephalon, and rhombencephalon.

secondary brain vesicles  the five brain vesicles formed by specialization of the prosencephalon (telencephalon and diencephalon), mesencephalon, and rhombencephalon (metencephalon and myelencephalon) in later embryonic development.

seminal vesicle  either of the paired sacculated pouches attached to the posterior urinary bladder; the duct of each joins the ipsilateral ductus deferens to form the ejaculatory duct.

Vesicula seminalis (seminal vesicle) in a median sagittal section of the male urogenital organs.

umbilical vesicle  the pear-shaped expansion of the mammalian yolk sac growing out into the cavity of the chorion, joined to the midgut by the yolk stalk.

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umbilical vesicle

n.

See yolk sac.

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umbilical vesicle,

a pear-shaped structure formed from the yolk sac at about the fourth week of prenatal development that protrudes into the cavity of the chorion and connects to the developing embryo by the yolk stalk at the region of the future midgut.

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vesicle

1. a small bladder or sac containing liquid.

2. a small circumscribed elevation of the epidermis containing a serous fluid; a small blister. See also vesicular disease.

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auditory vesicle

a detached ovoid sac formed by closure of the auditory pit in the early embryo, from which the percipient parts of the inner ear develop.

brain v's

the five divisions of the closed neural tube in the developing embryo, including the telencephalon, diencephalon, mesencephalon, metencephalon and myelencephalon.

chorionic vesicle

see chorionic vesicle.

clear vesicle

neuronal vesicles which occur in neuronal terminals in which acetylcholine is the transmitter.

coated vesicle

see coated pits.

compound vesicle

multilocular vesicle.

dense core vesicle

neuronal vesicles which occur in neuronal terminals in which norepinephrine or other catecholamine is the transmitter. Called also granular vesicle.

encephalic v's

brain vesicles.

germinal vesicle

the fluid-filled nucleus of an oocyte toward the end of prophase of its meiotic division.

granular vesicle

see dense core vesicle (above).

lens vesicle

a vesicle formed from the lens pit of the embryo, developing into the crystalline lens.

matrix v's

vesicles found in hyaline cartilage; are starting points for growth plate mineralization.

multilocular vesicle

a vesicle with multiple chambers or compartments.

olfactory vesicle

1. the vesicle in the embryo which later develops into the olfactory bulb and tract.

2. a bulbous expansion at the distal end of an olfactory cell, from which the olfactory hairs project.

otic vesicle

auditory vesicle.

pinocytotic v's

vesicles which appear in vascular endothelium; may participate in transcapillary movement of macromolecules.

primary brain v's

the three earlier subdivisions of the embryonic neural tube, including the forebrain, midbrain and hindbrain.

secondary brain v's

the four brain vesicles formed by specialization of the forebrain and of the hindbrain in later embryonic development.

secretory v's

vesicles found in rough excretory endoplasm of cells.

seminal v's

paired sacculated pouches that overlie the urinary bladder in the males of some species; in some the pouch is a simple sac, in others a compound acinous gland, and in some the duct of each joins the ipsilateral ductus deferens to form the ejaculatory duct. In the boar and stallion it produces a bulky ejaculate. See also vesicular gland.

transfer v's

vesicles found in rough endoplasmic reticulum of cells.

transport vesicle

membrane bound vesicle, pinched off from endoplasmic reticulum, containing macromolecules to be transported to other parts of the cell.

umbilical vesicle

the pear-shaped expansion of the yolk sac growing out into the cavity of the chorion, joined to the midgut by the yolk stalk.