ANAT 215 Lecture Notes - Lecture 25: Costal Cartilage, Serratus Anterior Muscle, Thoracic Vertebrae

• School: Queen's University
• Department: Anatomy and Cell Biology
• Course: ANAT 215
• Professor: Leslie W Mac Kenzie

Document Summary

Thoracic and abdominal walls (reading materials: chapter 6: pages 174-176; chapter 10: pages 281-284; chapter 22: pages 587, 593, 595) Protect organs of thoracic cavity (heart, lungs) and protects some abdominal organs. Provides itself as being the structural basis for the mechanical function of breathing. Attachment (for upper limbs, and mammary glands of breasts) consists of the vertebrae, ribs and sternum. 3 types: true ribs, false ribs (false and floating) 12 pairs true ribs (pairs 1-7): false ribs (pairs 8-12): attached to sternum directly by their own costal cartilages. Attached indirectly to the sternum via another rib"s costal cartilage. Floating(free) ribs (11 and) head no attachment to the sternum pairs 11 and 12 are called false floating rib. Anchored into muscles of postanterior wall structure of a typical rib: Shape of a wedge, has 2 articulating facets. 1 articulating facet will allow articulation with the same numbered vertebrae, other will allow for articulation with vertebrae right abpove it.