| optic disk drusen | Hyaline bodies occurring in the intra-ocular portion of the optic nerve. They are distinguished from retinal drusen, which lie beneath the retinal pigment epithelium. This disorder is differentiated also from papilledema by the absence of dilated retinal vessels. (12 Dec 1998) |
|---|---|
| tactile disk | A specialised tactile sensory nerve ending in the epidermis, characterised by a terminal cuplike expansion of an intraepidermal axon in contact with the base of a single modified keratinocyte. Synonym: meniscus tactus, Merkel's corpuscle, Merkel's tactile cell, Merkel's tactile disk, tactile disk. (05 Mar 2000) |
| tactile hair | The vibrissae or whiskers of animals such as rats and cats which have especially well developed touch endings in the follicular wall. (05 Mar 2000) |
| temporomandibular articular disk | The fibrocartilaginous plate that separates the joint into upper and lower cavities. Synonym: discus articularis temporomandibularis, mandibular disk, temporomandibular articular disk. (05 Mar 2000) |
| temporomandibular joint disk | A plate of fibrous tissue that divides the temporomandibular joint into an upper and lower cavity. The disk is attached to the articular capsule and moves forward with the condyle in free opening and protrusion. (boucher's clinical dental terminology, 4th ed, p92) (12 Dec 1998) |
| terminal hair | A mature pigmented, coarse hair. (05 Mar 2000) |
| embryonic disk | Germ disk, the point in a telolecithal ovum where the embryo begins to be formed. Synonym: embryonic disk, germinal area, area germinativa. (05 Mar 2000) |
| transverse disk | One of the dark transverse bands seen on examining a striated muscular fibre under the microscope. (05 Mar 2000) |
| triangular disk of wrist | The disk that holds together the distal ends of the radius and ulna; it is attached by its apex to a depression between the styloid process and distal surface of the head of the ulna, and by its base to the ridge separating the ulnar notch from the carpal surface of the radius. Synonym: discus articularis radioulnaris, radioulnar disk, radioulnar articular disk, triangular cartilage, triangular disk of wrist, triquetrous cartilage. (05 Mar 2000) |
| exclamation point hair | <clinical sign> The type of dystrophic anagen hair found at margins of patches of alopecia areata. The bulb is absent. (21 Jun 2000) |
| Z disk | <cell biology> The line formed where actin filaments attach between two sarcomeres. (11 May 1997) |
| kinky hair | Tightly curled or bent hair. See: kinky-hair disease. (05 Mar 2000) |
| kinky-hair disease | Kinky hair disease, congenital defect of copper metabolism manifested in short, sparse, poorly pigmented kinky hair; associated with failure to thrive, physical and mental retardation, and progressive severe deterioration of the brain; apparently a defect of copper transport; X-linked recessive inheritance. Synonym: kinky-hair disorder, Menkes' syndrome, trichopoliodystrophy. (05 Mar 2000) |
| kinky-hair disorder | Kinky hair disease, congenital defect of copper metabolism manifested in short, sparse, poorly pigmented kinky hair; associated with failure to thrive, physical and mental retardation, and progressive severe deterioration of the brain; apparently a defect of copper transport; X-linked recessive inheritance. Synonym: kinky-hair disorder, Menkes' syndrome, trichopoliodystrophy. (05 Mar 2000) |
| kinky hair syndrome | <syndrome> Genetic disorder with fragile twisted ( kinky ) hair and progressive deterioration of the brain. Due to an error in copper transport resulting in copper deficiency. Females are carriers and their sons with the gene have the disease. Also known as menkes syndrome. (12 Dec 1998) |