Aphasmidea Flashcards
A. Adult Worm
“ minute and appears threadlike
“ it is more delicate anteriorly than posteriorly
Trichinella spiralis
Male Worm
• measures 1.4-1.6 mm in length by 40-60 micra in transverse diameter
cloaca is found at the caudal end which is evertible during coitus. It is guarded by 2 conspicuous conical papillae which clasp the female during copulation
spicule is absent, posterior end of the worm is curved ventrad
Trichinella spiralis
Female Worm
. about 3-4 mm long and 60-80 micra in width
• vulva opens at the anterior fifth of the body
• has a single uterus which contains larvae
. a single ovary is found near the bluntly rounded caudel end
Trichinella spiralis
Larva
measures 100 by 6 micra when extruded by the female worm
provided with a spear-like burrowing tip at its tapering anterior end .
in the striated muscles, the larva grows to about 0.8-1mm and becomes encrusted along the axis of the muscle fibers
Trichinella spiralis
Trichuris trichiura (common name)
Whipworm
Adult Worm
whiplike is appearance
anterior 3/5 is very thin and hairlike
posterior 2/5 is thick and stout resembling the handle of a whip which houses the intestine and reproductive organs
the esophagus is a delicate capillary tubule capable of dilating at its distal end which is characteristically embedded in glandular cells called_____
stichocytes
Trichuris trichiura
Male Worm
• measures 3 - 3.5 cm
• testes are sacculate
” a single lanceolate spicule protrudes through a refractile penial which has a bulbous termination covered with small recurved spines sheath
” distinguished from the female by its coiled caudal extremity about 360 degrees or more.
Trichuris trichiura
Female Worm
• measures 3.5 - 5.5 cm in length
“ vulva opens at the anterior end, the fleshy portion of the body
“ has a single uterus and ovary
“ bluntly rounded at the posterior end
Trichuris trichiura
Ovum
. characteristically barrel-shaped with bipolar unstained
intralaminar prominences which have the appearance of mucoid plugs
measures **50-54 micra by 22-23 micra **
it is passed in the unsegmented stage
Trichuris trichiura
Trichuris trichiura
in addition to a vitellaine membrane, it has a triple shell consisting of
chorionic layer
albuminous layer
bile-stained layer
A. Adult Worm
characteristically filiform anteriorly and stout posterior but the tapering is gradual and less pronounced
Capillaria philippinensis
Male Worm
small, measuring 1.5 to 3.9 mm in length
characterized by caudal alae and long, non-spiny sheaths
Capillaria philippinensis
Female Worm
• measures 2.3 to 5.3 mm in length
” body is divided into 2 almost equal parts, the anterior containing esophagus and esophageal glands and the posterior containing intestine and reproductive system with slightly prominent vulva.
Capillaria philippinensis
Ovum
• similar to that of the whipworm but are smaller about 42 by 20 micra usually in the single or 2-segmented stage of development
• more oval in shape
” bipolar mucous plugs that are not protruberant
shell is thick and pitted which appear as strations hence peanut-shaped
Capillaria philippinensis
Male Worm
“ much more delicate than those of T. trichiura
measures about 10 mm long
” has a * slightly chitinized spicule* within a protrusible membranous sheath
Capillaria hepatica
