| head presentation | Presentation of any part of the foetal head, usually the upper and back part as a result of flexion such that the chin is in contact with the thorax in vertex presentation; there may be degrees of flexion so that the presenting part is the large fontanel in sincipital presentation, the brow in brow presentation, or the face in face presentation. Synonym: head presentation. (05 Mar 2000) |
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| head process | The primordium for the notochord. See: notochordal process. (05 Mar 2000) |
| head protective devices | Personal devices for protection of heads from impact, penetration from falling and flying objects, and from limited electric shock and burn. (12 Dec 1998) |
| head tetanus | A type of local tetanus that follows wounds to the face and head; after a brief incubation (1-2 days) the facial and ocular muscles become paretic yet undergo repeated tetanic spasms. The throat and tongue muscles may also be affected. Synonym: cerebral tetanus, head tetanus, hydrophobic tetanus, rose cephalic tetanus, Rose's cephalic tetanus. (05 Mar 2000) |
| head tremors | Head movements associated with congenital nystagmus, spasmus nutans, and miner's nystagmus. Synonym: head tremors. (05 Mar 2000) |
| Head's areas | Area's of skin exhibiting reflex hyperesthesia and hyperalgesia due to visceral disease. (05 Mar 2000) |
| Head's lines | Bands of cutaneous hyperesthesia associated with acute or chronic inflammation of the viscera. Synonym: Head's zones, tender lines, tender zones. (05 Mar 2000) |
| Head's zones | Bands of cutaneous hyperesthesia associated with acute or chronic inflammation of the viscera. Synonym: Head's zones, tender lines, tender zones. (05 Mar 2000) |
| Head, Sir Henry | <person> English neurologist, 1861-1940. See: Head's areas, Head's lines, Head's zones. (05 Mar 2000) |
| head-bobbing doll syndrome | <syndrome> Bobbing motion of the head usually due to cysts in or about the third ventricle. (05 Mar 2000) |
| head-down tilt | Posture while lying with the head lower than the rest of the body. Extended time in this position is associated with temporary physiologic disturbances. (12 Dec 1998) |
| head-dropping test | A test used in the diagnosis of disease of the extrapyramidal or striatal system (e.g., parkinsonism, Wilson's disease); with the patient supine, relaxed, and his attention diverted, the examiner briskly lifts the patient's head with the right hand and then allows it to drop upon the palm of his left hand; the head of a normal person drops suddenly like a dead weight, whereas, in striatal disease the head falls slowly, gently, and almost hesitantly. (05 Mar 2000) |
| head-nodding | Head movements associated with congenital nystagmus, spasmus nutans, and miner's nystagmus. Synonym: head tremors. (05 Mar 2000) |
| head-tilt | An abnormal position of the head adopted to prevent double vision resulting from underaction of the vertical ocular muscles. (05 Mar 2000) |
| headache | Pain in various parts of the head, not confined to the area of distribution of any nerve. See: cephalodynia. Synonym: cephalalgia, cephalea, cerebralgia, encephalalgia, encephalodynia. (05 Mar 2000) |