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abdomen

Overview page. Subjects: Medicine and Health — Zoology and Animal Sciences.

That part of the body cavity below the chest and separated from it by the diaphragm. It contains a number of organs including the stomach, liver, kidneys, spleen, pancreas, and intestines.

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acrodont

Overview page. Subjects: Dentistry — Zoology and Animal Sciences.

Having tooth attachment in which the teeth are fused (ankylosed) to the jaw bone, rather than being located in sockets within the bone. It is common in reptiles and fish.

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acromion

Overview page. Subjects: Medicine and Health — Zoology and Animal Sciences.

n. an oblong process at the top of the spine of the scapula, part of which articulates with the clavicle (collar bone) to form the acromioclavicular joint. —acromialnull...

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adductor

Overview page. Subjects: Medicine and Health — Zoology and Animal Sciences.

n. any muscle that moves one part of the body towards another or towards the midline of the body.

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allantois

Overview page. Subjects: Zoology and Animal Sciences — Medicine and Health.

A saclike outgrowth of the ventral side of the hindgut present in the embryos of reptiles, birds, and mammals. The allantois represents a large and precocious development of the urinary...

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animal pole

Overview page. Subjects: Zoology and Animal Sciences — Medicine and Health.

The end (or pole) of an egg that contains the most cytoplasm and the least yolk. It is also the point on the surface of the egg that is nearest to its nucleus. The opposite end is called...

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antitragus

Overview page. Subjects: Medicine and Health — Zoology and Animal Sciences.

In Mammalia, the lower posterior part of the outer ear, which lies opposite the tragus.

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anus

Overview page. Subjects: Zoology and Animal Sciences — Medicine and Health.

n. the opening at the lower end of the alimentary canal, through which the faeces are discharged. It opens out from the anal canal and is guarded by two sphincters. The anus is...

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appetite

Overview page. Subjects: Sports and Exercise Medicine — Zoology and Animal Sciences.

A complex phenomenon, not to be confused with hunger, that in humans is the comparatively pleasant, though at times compelling, anticipation of certain foods. In other animals, appetite is...

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Ascaris

Overview page. Subjects: Medicine and Health — Zoology and Animal Sciences.

A genus of nematodes (Aschelminthes). Ascaris lumbricoides causes ascariasis in humans and is said to be the most common helminth infection of humans. Heavy infestations cause growth...

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