Septum

Look up septum in Wiktionary, the free dictionary.

A septum (Latin for something that encloses; plural Septa) is a partition separating two cavities or spaces. Examples include:

• Nasal septum: the cartilage wall separating the nostrils of the human nose.
• Cephalopod Septa: walls between each chamber, or siphuncle, in shells of nautiloids, ammonites, and belemnites; i.e. cephalopods that retain an external shell.
• The wall dividing the right side of the heart from the left side.
• A partition dividing filamentous hyphae into discrete cells in fungi

Histological septa are seen throughout most tissues of the body, particularly where they are needed to stiffen soft cellular tissue, and they also provide planes of ingress for small blood vessels. Because the dense collagen fibres of a septum usually extend out into the softer adjacent tissues, microscopic fibrous septa are less clearly defined than the macroscopic types of septa listed above. In rare instances, a septum is a cross-wall.

The septum is also found within the chambers of the heart. It provides strength to the walls of the heart and separates the left and right sides of the heart.

Particle accelerators

Septum magneta and electrostatic septum are two types of septa that can deflect an ejected beam while not affecting the orbiting beam. These devices are used with a circular particle beam accelerator to inject or eject a beam of particles to or from an accelerator.

Brain physiology

Part of the limbic system that regulates emotions and the ability to learn and control impulses as well as such drives as sex, hunger, thirst, aggression, and fear. The septum (or septal nuclei) in the brain is named for its approximate shape (partition). The septum is rich with nicotinic cholinergic receptors.

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