In this diagram of a duplicated chromosome, (2) identifies the centromereâthe region that joins the two sister chromatids, or each half of the chromosome. In prophase of mitosis, specialized regions on centromeres called kinetochores attach chromosomes to spindle fibers. The centromere is the part of a chromosome that links sister chromatids or a dyad. During mitosis, spindle fibers attach to the centromere via the kinetochore. Centromeres were first thought to be genetic loci that direct the behavior of chromosomes.
Carotid Artery Pain in Left Side of Neck. The carotid artery pain in left side of neck means (if this is the case) that there may be carotid artery disease which is when the arteries that supply the brain (its front) with oxygenated blood, get narrowed.hen the carotid arteries get dilated or distended the carotidynia occurs. It has 3 types: classic, migrainous and arteriosclerotic, and all of them lead to pain in left side of neck, as well as to face, head or ear pain.
Neck pain may be caused by injury, inflammation, or infection. Common causes of neck pain include muscle strains and muscle spasms. Additional causes of neck pain include infections of the neck, arthritis of the spine, and a herniated disk.