Health Sciences 2300A/B Lecture Notes - Lecture 7: Internal Intercostal Muscles, Abdominal Internal Oblique Muscle, Plywood
16 Dec 2016
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Document Summary
These muscles are deeper within the back and are collectively referred to as the erector spinae muscles. Iliocostalis: runs from the iliac crest to the angles of the ribs. Longissimus: attaches from the transverse processes of lumbar vertebrae to the transverse processes of thoracic and cervical vertebrae. Spinalis: attaches to the spines of the lumbar vertebrae and lower thoracic vertebrae to the upper thoracic vertebrae and cervical vertebrae. These muscles are considered to be true back muscles responsible for keeping us standing. They are true back muscles because they do not move any limbs. Their purpose is to extend the trunk and to maintain posture and balance. There is white connective tissue known as thoracolumbar fascia inferior to these back muscles. This is why some sports result in triangular bruising. Nerves come off from two horns composed of grey matter in the spinal cord. These horns are known as the ventral horn and the dorsal horn.
