Kinesiology 2222A/B Lecture 7: Muscles of the Trunk

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2222A/B
• Professor: Jamie Melling

Document Summary

Only few muscles are true back muscles: keep the spine erect creates posture, extend trunk, maintain balance. Erector spinae muscles (i like standing muscles): Attaches on the angle of the ribs: feathers out along the back (covers a lot of area, longissimus. Insertion: transverse processes of lumbar, thoracic & cervical vertebrae (all: spinalis. Insertion: spinous processes of cervical, lumbar and thoracic. Aim: understand the spinal nerves that come off of the spinal cord considered a spinal nerve after it passes the intervertebral foramen. Ventral and dorsal horns within spinal cord. Roots come off of the spinal cord roots come together to form rami. Ventral horn sends motor information via ventral root: motor innervation will stimulate skeletal muscles causing them to contract, sends back sensory information. Lets body know what"s going on in the periphery. Need a constant supply of stimuli & sensory information. Sensory comes back into spinal cord via dorsal route.