Anatomy and Cell Biology 3319 Lecture Notes - Lecture 22: Occipital Bone, Temporal Bone, Nuchal Ligament
13 Dec 2016
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Lecture 22 muscles of thorax and back. Describe the anatomy of the bony rib cage. Understand the arrangements and actions of the intercostal muscles and diaphragm. Describe the intrinsic muscles (i. e. muscles which originate and insert into structures of the axial skeleton) of back: deep: transversospinales (interspinales, intertransversarii, rotatores, multifidus, semispinalis) Intermediate: erector spinae muscles (spinalis, longissimus, iliocostal: superficial: splenius. There are 25 bones in the thoracic cage (12 pairs of ribs + 1 sternum) True ribs (ribs 1-7) articulate with the sternum via their own, individual coastal cartilage. False ribs (ribs 8-10) articulate by piggybacking with the coastal cartilage of the true ribs above. The connecting ridges of the costal cartilage are known as the costal margin. Floating ribs (ribs 11-12) do not articulate with anything. The ribs articulate with the thoracic vertebrae at the coastal facets on the vertebral body and the transverse process. Note that t1 and t10-t12 will only articulate with a single thoracic vertebra.
