Biology

Mediastinum Definition Mediastinum is the area in the chest between the lungs that contains the heart, part of the windpipe (the trachea), the esophagus, and…

Thymus Gland Definition Thymus gland is an organ of the lymphatic system located behind the upper sternum (breastbone). T cells (T lymphocytes) develop and mature…

Nasal Concha Definition Nasal concha also called Turbinate, or Turbinal, any of several thin, scroll-shaped bony elements forming the upper chambers of the nasal cavities.…

Ethmoid Bone Definition Ethmoid bone is exceedingly light and spongy bone that provides the floor of the front part of the skull and the roof…

Hypermagnesemia Definition Hypermagnesemia is a disorder of serum electrolyte balance caused by the abnormally high concentration of magnesium in the blood. It is defined as…

Olfactory Nerve Definition Olfactory nerve is the first pair of cranial nerves that carries sensory information relating to smell from the nose to the brain.…

Facial Nerve Definition Facial nerve is the seventh cranial nerve, supplying the muscles controlling facial expression, glands of the palate and nose, and the taste…

Parotid Gland Definition Parotid gland is either of the pair of salivary glands situated below and in front of each ear. In humans, the two…

Osteocyte Definition Osteocyte is a cell characteristic of mature bone tissue. It is derived from osteoblasts and embedded in the calcified matrix of bone. Osteocytes…

Osteoclast Definition Osteoclast is a specialized bone cell that absorbs bone, allowing for the deposition of new bone and maintenance of bone strength. The osteoclast…

Androgen Receptor Definition Androgen receptor is a key mediator of androgen function within normal and malignant prostate cells. It is mainly expressed in androgen target…

Transcription Factor Definition Transcription factors (TFs) are proteins that regulate the transcription of genes—that is, their copying into RNA, on the way to making a…