| semiprone position | A position to facilitate a vaginal examination, the patient lying on the side with the under arm behind the back, the thighs flexed, the upper one more than the lower. Synonym: English position, lateral recumbent position, semiprone position. (05 Mar 2000) |
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| semiquartile | <astronomy> An aspect of the planets when distant from each other the half of a quadrant, or forty-five degrees, or one sign and a half. Source: Websters Dictionary (01 Mar 1998) |
| semiquinone | A free radical resulting from the removal of one hydrogen atom with its electron during the process of dehydrogenation of a hydroquinone to quinone or similar compound (e.g., flavin mononucleotide). (05 Mar 2000) |
| semiquintile | <astronomy> An aspect of the planets when distant from each other half of the quintile, or thirty-six degrees. Source: Websters Dictionary (01 Mar 1998) |
| semirecondite | <zoology> Half hidden or half covered; said of the head of an insect when half covered by the shield of the thorax. Source: Websters Dictionary (01 Mar 1998) |
| semiring | <anatomy> One of the incomplete rings of the upper part of the bronchial tubes of most birds. The semerings form an essential part of the syrinx, or musical organ, of singing birds. Source: Websters Dictionary (01 Mar 1998) |
| semisextile | <astronomy> An aspect of the planets when they are distant from each other the twelfth part of a circle, or thirty degrees. Source: Websters Dictionary (01 Mar 1998) |
| semispinal | Half spinal; denoting muscles attached in part to the spinous processes of the vertebrae. (05 Mar 2000) |
| semispinal muscle | <anatomy> The most superficial layer of the three layers of the transversospinal muscle; comprised of semispinalis capitis, semispinalis cervicis, and semispinalis thoracis muscles. Synonym: musculus semispinalis, semispinal muscle. (05 Mar 2000) |
| semispinal muscle of head | <anatomy, muscle> Origin, transverse processes of five or six upper thoracic and articular processes of four lower cervical vertebrae; insertion, occipital bone between superior and inferior nuchal lines; action, rotates head and draws it backward; nerve supply, dorsal primary rami of cervical spinal nerves. Synonym: musculus semispinalis capitis, musculus complexus, semispinal muscle of head. (05 Mar 2000) |
| semispinal muscle of neck | <anatomy> Continuous with musculus semispinalis thoracis; origin, transverse processes of second to fifth thoracic vertebrae; insertion, spinous processes of axis and third to fifth cervical vertebrae; action, extends cervical spine; nerve supply, dorsal primary rami of cervical and thoracic spinal nerves. Synonym: musculus semispinalis cervicis, musculus semispinalis colli, semispinal muscle of neck. (05 Mar 2000) |
| semispinal muscle of thorax | <anatomy, muscle> Origin, transverse processes of fifth to eleventh thoracic vertebrae; insertion, spinous processes of first four thoracic and fifth and seventh cervical vertebrae; action, extends vertebral column; nerve supply, dorsal primary rami of cervical and thoracic spinal nerves. Synonym: musculus semispinalis thoracis, musculus semispinalis dorsi, semispinal muscle of thorax. (05 Mar 2000) |
| semispinalis capitis | <anatomy, muscle> Origin, transverse processes of five or six upper thoracic and articular processes of four lower cervical vertebrae; insertion, occipital bone between superior and inferior nuchal lines; action, rotates head and draws it backward; nerve supply, dorsal primary rami of cervical spinal nerves. Synonym: musculus semispinalis capitis, musculus complexus, semispinal muscle of head. (05 Mar 2000) |
| semispinalis cervicis muscle | <anatomy> Continuous with musculus semispinalis thoracis; origin, transverse processes of second to fifth thoracic vertebrae; insertion, spinous processes of axis and third to fifth cervical vertebrae; action, extends cervical spine; nerve supply, dorsal primary rami of cervical and thoracic spinal nerves. Synonym: musculus semispinalis cervicis, musculus semispinalis colli, semispinal muscle of neck. (05 Mar 2000) |
| semispinalis muscle | <anatomy> The most superficial layer of the three layers of the transversospinal muscle; comprised of semispinalis capitis, semispinalis cervicis, and semispinalis thoracis muscles. Synonym: musculus semispinalis, semispinal muscle. (05 Mar 2000) |