समान शरीर के खंडों की एक श्रृंखला में से एक जिसमें कुछ जानवरों को अनुदैर्ध्य रूप से विभाजित किया जाता है

Noun:

कायखंड, भ्रूणकायखंड, देहभाग, विखंड,

somites's Usage Examples:

VII, Usually considered to be the tergum of the genital somite, but suggested by Pocock to be that of the other [According to the system of numbering explained in the text, if VII is the tergum of the praegenital somite (as is probable) it should be labelled Prg without any number, and the somites VIII to XIII should be lettered 1 to 6, indicating that they are the six normal somites of the mesosoma; whilst XV to XVIII should be replaced by the numbers 7 to 12 - an additional suppressed segment (making up the typical six) being reckoned to the metasomatic fusion.] (From Lankester, Q.

I to VI, The six appendagebearing somites of the prosoma.

This region corresponds in both cases to six somites, as indicated by the presence of six pairs of limbs.

In the direct development Bateson showed that the three divisions of the coelom arise as pouches constricted off from the archenteron or primitive gut, thus resembling the development of the mesoblastic somites of Amphioxus.

Besides the five limb-bearing somites just enumerated, two others must now be recognized in the head.

The brain innervates the eyes and feelers, and must be regarded as a " syncerebrum " representing the ganglia of the three foremost limb-bearing somites united with the primitive cephalic lobes.

The number of limb-bearing somites in the insectan head is thus seen to be seven.

The head of an insect carries usually four pairs of conspicuous appendages - feelers, mandibles and two pairs of maxillae, so that the presence of four primitive somites is immediately evident.

In the middle of the body, where the limits of the somites can be checked by a comparison with the arrangement of the nephridia and the gonads, and where the ganglia are quite distinct and separated by long connectives, each ganglion is seen to consist of six masses of cells enclosed by capsules and to give off three nerves on each side.

It has, however, been alleged that this cavity is formed by a pair of mesoblastic somites (N.

somites's Meaning':

one of a series of similar body segments into which some animals are divided longitudinally