Browse the glossary using this index

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Schwann cells

cells that make up the myelin sheath in a nerve cell


the tough outer layer of the eye

Sebaceous glands

glands that secrete sebum (oily substance)


physical display of violent cerebral disorder resulting from abnormal brain signalling


having one single reproductive episode in a lifetime

Sensory nerves

conduct nerve impulses from a structure or sensory organ towards the central nervous system


a partition that separates two chambers, as in the heart and nasal cavity

Simple epithelium

epithelium that consists of one layer of cells on a basement membrane

Sinoatrial node (SA node)

a small area of cells in the wall of the right atrium of the heart, where the electrical impulse is generated; also known as the natural pacemaker 


an air-filled cavity in the skull; any blind-ending tract in a tissue

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