IHST 1001 Lecture Notes - Lecture 10: Cardiac Muscle, Skeletal Muscle, Mechanical Energy

• School: York University
• Department: Global Health
• Course: IHST 1001
• Professor: Nicolette S Richardson

Document Summary

Interconnected, contract as one (so more than other muscle types: how muscles work - muscles can only pull, never push instead you have one muscle that. Axial muscles: trapezius, origin nuchal ligament, thoracic spinous processes, occipital bone, actions scapular elevation/depression/retraction. Latissimus dorsi: origin spinous processes of lumbar and lower thoracic vertebrae, sacrum, actions arm extension, arm adduction, internal rotation of arm. Levator scapulae: origin c1-c4 transverse processes, actions scapula elevation. Insertion medial border of scapula, superior to spine: rhomboid major & minor, origin c7-t5 spinous processes, actions retraction of scapula. Insertion medial border of scapula (rhomboid minor is superior to major: erector spinae, origin iliac crest, sacrum, lumbar and lower thoracic spinous processes, actions back extension, lateral flexion of back. Insertion ribs, transverse/spinous processes of cervical/thoracic vertebrae: sternocleidomastoid, origin clavicle, manubrium, actions neck flexion, lateral flexion of neck, neck rotation. Insertion mastoid process of temporal bone: three intercostal muscles, external fibers run down and forward, inspiration.