Anatomy

Definition of myelin

Myelin is a system of phospholipid bilayers made of sphingolipid, which enables the transmission of nerve impulses to various body regions through an insulating effect, forming sheaths that surround the axons of neurons. Myelin is specifically made up of a sphingophospholipid that is formed by sphingol, an alcohol […]

Definition of cleft lip

Cleft lip is a congenital defect that develops in the first three months of pregnancy, when one side of the upper lip grows unevenly. This creates a fissure or split in the upper lip, which takes on an appearance similar to a hare’s lip (from […]

Definition of hemisphere

Hemisphere is one half of the Earth’s surface, segmented by a great circle (such as the equator or a meridian). The term has its origin in the Latin word hemisphaerĭum, which in turn comes from a concept of Greek origin. In relation to the equator line, it must be said that […]

Definition of thorn

Thorn is a word that comes from the Latin term spina and has different meanings and uses. One of them refers to the spike, point or sting that emerges from the vascular or woody tissue of a plant species. For example: «Be careful, Molly! If you play next to those plants you could get a thorn stuck in you», «I tried to […]

Definition of aorta

The aorta is the artery that originates in the ventricle located in the left region of the heart muscle and forms an arch and extends towards the abdominal area. There, at the level of the fourth lumbar vertebra, it has a bifurcation that extends into two smaller arteries, which […]