Notch

[O. Du., nock, notch]. A deep indentation. N., Intervertebral, one of the depre ions on the vertebral pedicles, either on the upper or lower surface. The apposition of two notches of contiguous vertebrae forms the intervertebral foramen. N., Ischiatic. See N., Sacrosciatic. N., Jugular, a notch forming the posterior boundary of the jugular foramen. N., Nasal, an uneven interval between the internal angular proce es of the frontal bone, which articulates with the nasal bone and the nasal proce of the superior maxillary bone. N., Popliteal, the depre ion on the posterior surface of the head of the tibia, separating the two tuberosities. N. of Rivinus, the deficiency in the o eous tympanic ring, filled in by Shrapnell’s membrane. N., Sacrosciatic, one of two notches on the posterior edge of the innominate bone. The greater N. is just above the spine of the ischium, and is converted into a foramen by the le er sacrosciatic ligament; the le er N. is below the spine of the ischium, and is converted into a foramen by the sacrosciatic ligaments. N., Sigmoid, a deep semilunar depre ion separating the coronoid and condyloid proce es of the inferior maxillary bone. N., Sphenopalatine, the notch that separates the orbital and sphenoid proce es of the palate bone. N., Supra scapular, a notch in the superior border of the scapula at the base of the coracoid proce , for the pa age of the supra scapular nerve. N., Supra sternal, the depre ion at the top of the manubrium, between the two sternoclavicular articulations. 450