tropho-, troph-, -trophy, -trophs, -trophically, -trophic, -trophous

1. Impaired nutrition of hair, which can lead to baldness.
2. Defective nutrition of hair, often culminating in alopecia. May be acquired or congenital; the latter often with metabolic or other birth defects.

Congenital defect of copper metabolism manifested in short, sparse, poorly pigmented kinky hair.

This condition is associated with failure to thrive in life, physical and mental retardation, and progressive severe deterioration of the brain; apparently a defect of copper transport.

1. An abnormality of the hair shaft in which the fine, brittle hairs show alternating light and dark zones when viewed under a polarizing microscope.

The sulfur content of the hair is greatly reduced and mental retardation has frequently been a related feature.

2. Congenital fragile hair with multiple fractures resulting from low sulfur-containing amino acid, cysteine, content of the hair, mental impairment, and short stature.

Nutrition of the hair.

Trophallactic fluid is a glandular fluid given by larvae to adults after being fed.

The exchange of food substances among members of a colony of social insects; such as, ants, bees, and termites.

1. A reference to or involving nutrition, digestion, assimilation, and growth.
2. Relating to or dependent upon nutrition.

Any part of the central nervous system whose proper functioning is thought to be necessary for the nutrition, growth, or maintenance of a peripheral part of the body; such as, the parietal lobe for the development of the muscles of an extremity.

A trophic influence or condition.

A participant in a trophobiotic relationship.

Symbiosis in insects in which food is obtained from one species (the trophobiont) by another in return for protection.

The cell layer that forms the outer wall of the blastocyst. It supplies the embryo with nutrients and aids with implanting the embryo in the uterine wall.

In mammals, a layer of tissue formed by cells forming the outer covering of the blastocyst. After implanation of the blastocyst, this layer is no longer cellular. At the 5th-5th day of human pregnancy, the blastocyst attaches to the luteinized endometrium and differentiates on its surface a syncytium which helps to penetrate the epithelium and then break through into the maternal mucous membrane (implanation).

As early as implanation (about the 8th-9th day), the trophoblast starts to establish a fetal-maternal exchange of gases and nutriments. When the blastocyst has completely penetrated into the maternal mucosa, the trophoblast consists of an external syncytial layer around the blastocyst, the syncytiotrophoblast, and an internal cellular layer, the cytotrophoblast.

A cell that supplies nourishment to other cells.