BIOL 115 Lecture Notes - Lecture 5: Transverse Plane, Costovertebral Joints, Interspinous Ligament
Document Summary
Body: equal ap and transverse diameter, wedge shaped bodies (greater posterior height than anterior. Facets for rib articulation: head of ribs 2-10, articulate at junction of t1-2 through t9-10. Costovertebral joint: rib head with pair costal facet, span 1 intervertebral junction. T1: full costal facet superiorly accepts head of 1st rib, partial facet inferiorly accepts part of head of 2nd rib. T11 & t12: single full facet articulates with head 11th and 12th ribs. Joints between adjacent thoracic vertebra: interbody joints, facet joints. Categories of thoracic vertebra transverse process: upper t1-t4, mid-thoracic t5-t9 side bending and rotation minimally limited by articulation, lower thoracic t10-t12 less rotation. T- spine (orientation facets change at t10/t11: upper thoracic level- sb and rotation couple in same direction, lower thoracic level- rotation may be accompanied by sb in opposite direction. Function: provides stable base for muscle to control craniocervical region, protects intrathoracic organs, acts as mechanical bellows for breathing.
