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.
What causes neck pain? The neck consists of the cervical spine and spinal cord, nerves, intervertebral discs, muscles, ligaments, and tendons. Any of these structures can become irritated or inflamed in response to a variety of mild to serious conditions, such as poor posture, trauma, cervical spondylosis, and arthritis. Common causes of neck pain are overuse, poor posture, and whiplash, which is often incurred in a car accident or other trauma. Neck pain can also be caused by rheumatoid arthritis or fibromyalgia. A problem or injury in another part of the body, such as the chest, shoulders and head, can also radiate to the neck.