ANAT 215 Lecture Notes - Lecture 16: Suprasternal Notch, Pectoralis Major Muscle, Pectoralis Minor Muscle

• 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) Consists of the vertebrae, ribs and sternum: Functions: protection, the whole function of the ribcage/wall, protect the vital organs in the thoracic cavity. Also protects some of the abdominal organs: breathing. Provides the physical mechanics for our ability to breath: attachment. Important point of attachment for upper limbs and the rest of body. 12 pairs: each attaching to a thoracic spinal segment. True ribs (pairs 1-7) : attached to sternum directly by costal cartilages: directly connected. The distal part is embedded in the musculature of the posterior abdominal wall. Costal cartilage: articulates with the muscles in the thoracic wall directly or indirectly. Structure of a typical rib: ribs 3-10, all composed of the same components: head: wedge-shaped head. Distal end: connects bony part of the rib with the cartilage: angle: about 1/3 way through, it curves forward and downward.