Sentences with phrase «thoracic segments»
"Thoracic segments" refer to the sections of the spine located in the upper and mid-back region. These segments are connected to the ribs and serve to protect vital organs such as the heart and lungs. Full definition
Sympathetic nerves originate inside the vertebral column, toward the middle of the spinal cord in the intermediolateral cell column (or lateral horn), beginning at the first thoracic segment of the spinal cord and are thought to extend to the second or third lumbar segments.
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Since flies have legs only in thoracic segments, the presence of neuroblasts in these segments indicates the coordination of neurogenesis with development of the body plan at the stem - cell level,» says James Truman, co-author of the study.
In these animals, the first few thoracic segments have appendages that look like those of the head.
The upper cervical and upper thoracic segments are typically most severely affected.
In a study published in the open access scientific journal eLife, Roberto A. Keller and Patrícia Beldade from the Instituto Gulbenkian de Ciência (IGC, Portugal), in collaboration with Christian Peeters from Université Pierre et Marie Curie (France), showed that ants grow the size of their thoracic segments differently according to the specialized tasks they will perform as adults.
Keller observed that in workers the thoracic segment closer to the head is greatly enlarged and filled by strong neck muscles.
«In primitive kinds of crustaceans, we found Ubx - abdA is turned on in the first thoracic segment and is «on» from there back to the tail,» Patel said.