| posterior nasal spine | The sharp posterior extremity of the nasal crest of the hard palate. Synonym: spina nasalis posterior, posterior palatine spine. (05 Mar 2000) |
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| haemal spine | The middle point on the underside of the haemal arch of the typical vertebra; considered by some to be represented by the sternum in humans. (05 Mar 2000) |
| posterior palatine spine | The sharp posterior extremity of the nasal crest of the hard palate. Synonym: spina nasalis posterior, posterior palatine spine. (05 Mar 2000) |
| posterior superior iliac spine | The posterior extremity of the iliac crest, the uppermost point of attachment of the sacrotuberous and posterior sacroiliac ligaments; a readily apparent dimple occurs in the skin overlying the posterior superior iliac spine which is clinically useful as an indication of the level of the S-2 vertebra, the level of the inferior limit of the subarachnoid space. Synonym: spina iliaca posterior superior. (05 Mar 2000) |
| Henle's spine | Small bony prominence anterior to the supramastoid pit at the posterosuperior margin of the bony external acoustic meatus. Synonym: spina suprameatica, Henle's spine, meatal spine, spina meatus. (05 Mar 2000) |
| sciatic spine | A pointed process from the posterior border of the ischium on a level with the lower border of the acetabulum; gives attachment to the sacrospinous ligament; the pudendal nerve passes dorsal to the ischial spine, which is palpable per vagina or rectum, and thus is used as a target for the needle-tip in administering a pudendal nerve block. Synonym: spina ischiadica, ischiadic spine, sciatic spine. (05 Mar 2000) |
| pubic spine | A small projection at the anterior extremity of the crest of the pubis about 2 cm from the symphysis. Synonym: tuberculum pubicum, pubic spine, spina pubis. (05 Mar 2000) |
| sphenoidal spine | A posterior and downward projection from the greater wing of the sphenoid bone on either side, located posterolateral to the foramen spinosum, so-named for its proximity to the sphenoidal spine; gives attachment to the sphenomandibular ligament. Synonym: processus spinosus, spina ossis sphenoidalis, alar spine, angular spine, spina angularis, spinous process. (05 Mar 2000) |
| spine | A stiff, sharp-pointed structure, formed by modification of a plant organ, for example a lateral branch or a stipule. (09 Oct 1997) |
| spine-finned | <zoology> Having fine supported by spinous fin rays; said of certain fishes. Source: Websters Dictionary (01 Mar 1998) |
| spine fracture | A break in the bony cortex of the vertebrae. Spine fractures must be assessed as stable or unstable. Unstable spine fractures pose a risk of spinal cord injury due to abnormal movement at the fracture site. (27 Sep 1997) |
| spine of helix | An anteriorly directed spine at the extremity of the crus of the helix of the auricle. Synonym: spina helicis, apophysis helicis. (05 Mar 2000) |
| spine of scapula | The prominent triangular ridge on the dorsal aspect of the scapula, providing attachment for the trapezius and deltoid muscles and separating the supra-and infraspinous fossae. Synonym: spina scapulae. (05 Mar 2000) |
| spine sign | <clinical sign> Resistance to flexion of the spine in cases of meningitis. (05 Mar 2000) |
| spine-tailed | <zoology> Having the tail quills ending in sharp, naked tips. Spine-tailed swift. <zoology> See Spinetail . Source: Websters Dictionary (01 Mar 1998) |