One of the most peculiar aspects of the living sperm whale is a mass of tissue cradled on its skull called the spermaceti organ.
Polyps that remain physically attached to one another or embedded in a common mass of tissue constitute a colony.
He now claims, with characteristic boldness, to have developed the only biological theory that explains how the marvellous phenomenon of the mind somehow emerges from the enigmatic three-pound mass of tissue known as the brain.
"You can't grow a big mass of tissue without a blood supply, so a cell has to be within about five cell diameters of the nearest capillary to stay alive".
The teenager had been born with a rare vascular anomaly that severely disfigured his face with a mass of tissue; his condition was greatly improved by the grueling operation, but he still faces more surgery.
Except when a suspensor is formed, early cleavages follow no well-defined plan, and the product is an ovoid mass of tissue called the proembryo.
Typically, the primitive brain of the flatworm consists of a bilobed mass of tissue with lateral longitudinal nerve cords connected by transverse connectives, thus forming a rather ladderlike structure or grid running the greater length of the organism.
The microspore divides to form a reduced gametophyte, merely a jacket of cells and a few sperm cells; the megaspore divides to form a mass of tissue and archegonia, each enclosing an egg.
He was told a granuloma – a mass of tissue that forms in response to infection – had appeared in the same spot where a surgeon had removed another growth in late October.
Indeed, the relatively large mass of tissue and fluid involved in the response to sounds is in part responsible for the efficiency of the ear at low frequencies and also for the rapid loss of sensitivity as frequency increases.
The inner cell grows inward, producing the stem and first leaf, and the outer cell divides to form a foot, a mass of tissue that exists as part of the embryo and disappears when its function, presumably absorption, is completed.
