Sentence examples for head segment from inspiring English sources

The ancestors of insects most likely had bodies consisting of many similar segments with only minor aggregation of the nervous system in the anterior (head) segment.

They have as many as 200 pairs of legs two pairs on each diplosomite except for the first (head) segment, which is legless, and the next three segments, which each contain one pair of legs.

Stream segments that might be a head segment, or might be defined as a segment between two segment junctions were created to produce a stream link grid map.

Because the only arthropods with appendages mounted on the front of their heads are extinct species from 500 million years ago, it seemed likely that sea spiders are living fossils that have retained an extra head segment adorned with appendages.

The strange positioning of the grabber nerves may be due to a rearrangement of the brain during sea spider evolution rather than an extra head segment lost in all other arthropod species, the team reports 25 May in Nature.

The pattern of segment fusion that forms chelicerates' heads is unique among arthropods, and what would normally be the first head segment disappears at an early stage of development, so that chelicerates lack the antennae typical of most arthropods.

All maps are normalized relative to cells from the head segments, as in Fig. 4. c, Pearson correlation between datasets 1 and 2 by segment.

A repeated-measures analysis of variance was used to assess systematic changes in the alignment of the pelvic, thoracic, and head segments, and the thoracolumbar and cervicothoracic spines.

In some instances, articulated or swing axles that have tubular housings surrounding the axle shafts terminate in spherical head segments that fit into matching sockets formed in the sides of the central gear housing.

The pattern of tlr expression at the extended germ band stage is characterized by 15 transverse stripes in the gnathal and trunk segments, with four patches of expression corresponding to head segments and an additional patch of expression in the presumptive hindgut.

The ganglia of other head segments are often close to the brain and function as part of it.