| snake's-head | <botany> The Guinea-hen flower; so called in England because its spotted petals resemble the scales of a snake's head. <botany> Snake's-head iris, an iridaceous plant (Hermodactylus tuberosus) of the Mediterranean region. The flowers slightly resemble a serpent's open mouth. Source: Websters Dictionary (01 Mar 1998) |
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| sperm head | The anterior, usually ovoid, nucleus-containing part of spermatozoa. (12 Dec 1998) |
| death's-head | A naked human skull as the emblem of death; the head of the conventional personification of death. "I had rather be married to a death's-head with a bone in his mouth. <zoology> " (Shak) Death's-head moth, a very large European moth (Acherontia atropos), so called from a figure resembling a human skull on the back of the thorax. Synonym: death's-head sphinx. Source: Websters Dictionary (01 Mar 1998) |
| deep head of flexor pollicis brevis | The head of short flexor of the thumb that arises from the trapezoid and capitate bones and transverse carpal ligaments. It is innervated by the deep ulner nerve, and considered by many to be the first palmar interosseous muscle. Synonym: caput profundum musculi flexoris pollicis brevis. (05 Mar 2000) |
| swollen head syndrome | <syndrome> A disease of chickens caused by the turkey rhinotracheitis virus. (05 Mar 2000) |
| drusen of the optic nerve head | Basophilic, laminated, calcareous acellular masses that resemble crystals within the nerve head, anterior to the lamina cribrosa, that may simulate papilledema and/or cause visual field defects. Synonym: intrapapillary drusen. (05 Mar 2000) |
| intra-articular ligament of costal head | Transverse fibres extending within the capsule from the ridge between the two facets on the head of the rib to the intervertebral disk. Synonym: ligamentum capitis costae intra-articulare. (05 Mar 2000) |
| oblique head | Head of origin which is diagonally situated. Nomina Anatomica lists oblique heads (caput obliquum...) of the following: 1) adductor hallucis muscle (... Musculi adductoris hallucis ); 2) adductor pollicis muscle (... Musculi adductoris pollicis ). Synonym: caput obliquum. (05 Mar 2000) |
| occipital region of head | The surface region of the head corresponding to the outlines of the occipital bone. Synonym: regio occipitalis capitis. (05 Mar 2000) |
| open head injury | A head injury in which there is a loss of continuity of scalp or mucous membranes; the term is sometimes used to indicate a communication between the exterior and the intracranial cavity. See: penetrating wound. (05 Mar 2000) |
| optic nerve head | The portion of the optic nerve seen in the fundus with the ophthalmoscope. It is formed by the meeting of all the retinal ganglion cell axons as they enter the optic nerve. Because the retina at the optic disk has no photoreceptors there is a corresponding blind spot in the visual field. (12 Dec 1998) |
| temporal region of head | The surface region of the head corresponding approximately to the outlines of the temporal bone. Synonym: regio temporalis capitis. (05 Mar 2000) |
| tough-head | <zoology> The ruddy duck. Source: Websters Dictionary (01 Mar 1998) |
| tow-head | 1. An urchin who has soft, whitish hair. 2. <zoology> The hooded merganser. Source: Websters Dictionary (01 Mar 1998) |
| transverse head | Head of origin of a muscle which is transversely situated. Nomina Anatomica lists transverse heads (caput transversum...) of the following: 1) adductor hallucis muscle (... Musculi adductoris hallucis ); 2) adductor pollicis muscle (... Musculi adductoris pollicis ). Synonym: caput transversum. (05 Mar 2000) |