| thoracic spine fracture | <orthopaedics> Bony fracture of one of the twelve thoracic vertebrae. (27 Sep 1997) |
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| erector muscle of spine | Origin, from sacrum, ilium, and spines of lumbar vertebrae; it divides into three columns, iliocostalis musculus, longissimus musculus, and spinalis musculus, which insert into ribs and vertebrae with additional muscle slips joining the columns at successively higher levels; action, extends vertebral column; nerve supply, dorsal primary rami of spinal nerves. Synonym: musculus erector spinae, erector muscle of spine, musculus sacrospinalis. (05 Mar 2000) |
| trochlear spine | A spicule of bone arising from the edge of the trochlear fovea, giving attachment to the pulley of the superior oblique muscle of the eyeball. Synonym: spina trochlearis. (05 Mar 2000) |
| unstable cervical spine fractures | <radiology> Flexion: bilateral interfacetal dislocation, flexion teardrop fracture (usually C5 or C6) extension: extension teardrop fracture (usually C2 or C3), hangman's fracture, extension-dislocation, extension-fracture-dislocation, odontoid fracture vertical compression: Jefferson burst fracture see: cervical spine fractures (12 Dec 1998) |
| lesser tympanic spine | The posterior edge of the tympanic notch (of Rivinus). Synonym: spina tympanica minor. (05 Mar 2000) |