HK 3401 Lecture Notes - Lecture 7: Latissimus Dorsi Muscle, Anterior Ramus Of Spinal Nerve, Levator Scapulae Muscle

• School: University of Guelph
• Department: Human Kinetics
• Course: HK 3401
• Professor: Lorraine Jadeski

Document Summary

Two major groups of back muscles: extrinsic and intrinsic back muscles. Extrinsic back muscles: include superficial and intermediate muscles that produce and control limb and respiratory movements: superficial extrinsic: trapezius, latissimus dorsi, levator scapulae and rhomboids connect the upper limbs to the trunk. Superior and inferior serrates posterior is innervated by anterior rami. These muscles originate from the transverse processes of vertebrae and pass to spinous processes of more superior vertebrae. They occupy the gutter between the transverse and spinous processes. Superficial extrinsic back muscles: trapezius: provides a direct attachment of the pectoral girdle to the trunk. Assists in suspending upper limb: latissimus dorsi: Large, fan shaped muscle covering a wide area of the back. Passes from trunk to the humerus and acts directly on the glena-humeral (shoulder) join. Wednesday, september 21, 2016 and indirectly on the pectoral girdle. Deep extrinsic back muscles: levator scapulae: Lies deep to the scm; the inferior third is deep to the trapezius.