Septum

Septum (Latin saeptum 'fence', 'fence'; plural: septa or septa) stands for:

• Septum nasi, the nasal septum
• the partition between the halves of the heart; see heart
• Septum interalveolare or alveolar septum, the intervening wall of two adjacent alveoli.
• Septum pellucidum, a partition between lateral ventricles in the brain
• Connective tissue spaces between the skeletal muscles (intermuscular septa, muscle septum), see fascia
• the rectovaginal septum is a thin connective tissue partition between the vagina and the rectum.
• the vaginal septum is a congenital anatomical malformation of the vagina
• the fascia rectoprostatica or rectovaginal septum is a collection of several layers of connective tissue below the peritoneum urogenitale, caudal to the excavatio rectovesicalis, in the male sex. It corresponds to the fascia rectovaginalis in women
• the septum transversum, as one of the precursors of the diaphragm, is an embryonic structure
• the septum orbitale closes the orbit like a circular membrane running around the eyeball
• the intersinus, interfrontal septum separates the paired frontal sinus
• the median dorsal septum, the middle septum and the dorsal septum are retractions in the spinal cord
• the interdental septum is the bone between two teeth in the dental arch
• the interradicular septum is the bone between the root tips of teeth

For reptiles and amphibians

• in reptiles, septa separate the pulmonary from the systemic circulation and the arterial from the venous blood flow
• in some amphibians subdivisions of the ventricle in the heart

For birds

• Connective tissue membranes in the air sac (avian lung)

In Morphology in Lower Animals:

• the septa in the gastral cavity of corals, floral animals and on the corallite of stony corals, in corals a distinction is made between fleshy sarcosepts (mesenteries) and hard sclerosepts
• the chamber septum in the body of the cephalopods, here it separates 2 air chambers each; diaphragm, dissepiments.
• in the case of arthropods, an internal septum
• in horseshoe worms the septum separates the metocoel from the mesocoel
• In some snails that drop their shell tip, the resulting opening is closed by a transverse septum
• in the Annelida (annelids - earthworms), septa formed by the mutually adjacent walls of successive coelomic sacs
• in bryozoans mostly non-cellular connecting webs between neighbouring branches of fenestrate zoaria (colonies of zooids)
• in some graptolites periderm strands between adjacent branches of dendroid (branched, ramified) colonies

In botany

• the true septa of coenocarpic ovaries, which arise from intergrown carpel areas of the individual carpels. False septa, on the other hand, (false septa) are caused by growths
• septum (false or real depending on interpretation) of the replum in pods

In mycology

• the dividing wall between the hyphal compartments, see septum (mycology)

with technical reference:

• Septum (gas chromatography)
• a disturbance of the waveguide structure in a polarization switch, see Orthomode Transducer#Septum or Branching

Other:

• Septum piercing, a piercing through the connective tissue below the nasal septum cartilage

See also: