| alar 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) |
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| angular 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) |
| anterior inferior iliac spine | Spine on the anterior border of the ilium between the anterior superior iliac spine and the acetabulum; site of origin for the direct head of the rectus femoris muscle. Synonym: spina iliaca anterior inferior. (05 Mar 2000) |
| anterior nasal spine | A pointed projection at the anterior extremity of the intermaxillary suture; the tip, as seen on a lateral cephalometric radiograph, is used as a cephalometric landmark. Synonym: spina nasalis anterior. (05 Mar 2000) |
| anterior superior iliac spine | The anterior extremity of the iliac crest, which provides attachment for the inguinal ligament and the sartorius muscle. Synonym: spina iliaca anterior superior. (05 Mar 2000) |
| bamboo spine | In radiology, the appearance of the thoracic or lumbar spine with ankylosing spondylitis. (05 Mar 2000) |
| meatal 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) |
| cervical spine fractures | <radiology> Hyperflexion injury (46-79%), odontoid fracture, simple wedge fracture (stable), tear drop fracture, anterior subluxation, bilateral locked facets (unstable), anterior disc space narrowing, widened interspinous distance, clay shoveler's fracture hyperextension injury (20-38%), anteriorly widened disc space, prevertebral swelling, tear drop fracture, neural arch fracture of C1, subluxation (anterior/posterior), hangman's fracture flexion-rotation injury (12%), unilateral locked facets (stable) vertical compression (12%), Jefferson fracture, burst fracture lateral flexion/shearing (4-6%), uncinate fracture, isolated pillar fracture, transverse process fracture, lateral vertebral compression location (by frequency): C2,C6 greater than C5,C7 greater than C3,C4 greater than C1 see: atlas fracture, axis fracture, unstable fractures (12 Dec 1998) |
| cervical spine fusion | <radiology> (ankylosis) Posterior elements, JRA, vertebral bodies, block vertebrae, Klippel-Feil (12 Dec 1998) |
| mental spine | A slight projection, sometimes two, in the middle line of the posterior surface of the body of the mandible, giving attachment to the geniohyoid muscle (below) and the genioglossus (above). Synonym: spina mentalis, genial tubercle. (05 Mar 2000) |
| greater tympanic spine | The anterior edge of the tympanic notch (of Rivinus). Synonym: spina tympanica major. (05 Mar 2000) |
| cleft spine | See: spina bifida. (05 Mar 2000) |
| poker spine | Stiff spine resulting from widespread joint immobility or overwhelming muscle spasm as might be evoked by an osteomyelitis of a vertebra or a rheumatoid spondylitis. (05 Mar 2000) |
| crest of scapular spine | The posterior subcutaneous border of the spine of the scapula that expands in its medial part into a smooth triangular area. (05 Mar 2000) |
| posterior inferior iliac spine | Spine at the inferior end of the posterior border of the ilium between the posterior superior iliac spine and the greater sciatic notch; it forms the upper margin of the latter. Synonym: spina iliaca posterior inferior. (05 Mar 2000) |