Tag Archives | Zoology

ABOMASUM

The fourth compartment of ruminant's stomach.

Continue Reading · Comments { 0 }

ABORAL

Surface opposite or away from the mouth.

Continue Reading · Comments { 0 }

ABORTION

Termination of the pregnancy by removing a fetus or embryo from the uterus. It may happen spontaneously (then it is called miscarriage) or can be induced on purpose.

Continue Reading · Comments { 0 }

ACANTHOCEPHALA

Phylum of parasitic worms. Their body is characterized by elongated appendage called proboscis, which they use to pierce and hold the gut wall of the hosts. They have complicated life cycle that involves at least two different hosts. Around 1150 species are described so far.

Continue Reading · Comments { 0 }

ACARINA

Taxon of arachnids which includes mites and ticks. They are extremely diverse and old group of organisms (fossil records date back from Devonian period). Acarina could be found in various habitats. Some forms are parasitic.

Continue Reading · Comments { 0 }

ACCELERATOR

Any nerve, muscle or activating substance that accelerates the movement.

Continue Reading · Comments { 0 }

ACCESSORY

1. Eleventh cranial nerve which controls muscles of the shoulder and neck; 2. muscles of the shoulder girdle, chest wall, neck and abdomen, which assist other muscles.

Continue Reading · Comments { 0 }

ACCESSORY GLANDS

Small mass of glandular tissue detached from a gland of similar structure and function. They can be found in reproductive system, near adreanal glands, in the intestine.

Continue Reading · Comments { 0 }

ACCESSORY PULSATORY ORGANS

The small muscular sacs and accompanying veins in some insects that pump hemolymph into the wings.

Continue Reading · Comments { 0 }

ACCIPITRIFORMES

An order that includes diurnal birds of prey such as hawks, eagles, vultures. They have hooked beak, long and broad wings, strong legs, sharp claws and an opposable hind claw. Almost all of them are carnivores.

Continue Reading · Comments { 0 }