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A headache, also known as cephalalgia, is the symptom of pain in the face, head, or neck.It can occur as a migraine, tension-type headache, or cluster headache. [1] [2] There is an increased risk of depression in those with severe headaches.
An adult's trachea has an inner diameter of about 1.5 to 2 centimetres (1 ⁄ 2 to 3 ⁄ 4 in) and a length of about 10 to 11 cm (4 to 4 + 1 ⁄ 4 in), wider in males than females. [2]
The blood–brain barrier (BBB) is a highly selective semipermeable border of endothelial cells that regulates the transfer of solutes and chemicals between the circulatory system and the central nervous system, thus protecting the brain from harmful or unwanted substances in the blood. [1]
In mammals, invertebrates and most fish, [1] [2] the anus (pl.: anuses or ani; from Latin, 'ring' or 'circle') is the external body orifice at the exit end of the digestive tract (), i.e. the opposite end from the mouth.
In vertebrates, the circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the body. [1] [2] It includes the cardiovascular system, or vascular system, that consists of the heart and blood vessels (from Greek kardia meaning heart, and Latin vascula meaning vessels).
The Tocci Brothers, c. 1881. Polycephaly is the condition of having more than one head.The term is derived from the Greek stems poly (Greek: "πολύ") meaning "many" and kephalē (Greek: "κεφαλή") meaning "head". [1]
Detail of the Old English manuscript of the poem Beowulf, showing the words ofer hron rade (' over the whale's road '), meaning ' over the sea '.. A kenning (Icelandic: [cʰɛnːiŋk]) is a figure of speech, a figuratively-phrased compound term that is used in place of a simple single-word noun.
Dinocephalians were generally large. The biggest herbivores (Tapinocephalus) and omnivores (Titanosuchus) may have weighed up to 2 tonnes (4,400 lb), and were some 4.5 metres (15 ft) long, while the largest carnivores (such as Titanophoneus and Anteosaurus) were at least as long, with heavy skulls 80 centimetres (31 in) long, and overall masses of around a half-tonne.