ANAT 315 Chapter Notes - Chapter 3: Latissimus Dorsi Muscle, Rhomboid Major Muscle, Thoracolumbar Fascia
20 Oct 2017
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Anat 315: anatomy of the limbs an d back. Lecture 3: muscles of the back and neck. Sp = spinous process: tp = transverse process. Superficial muscles of the back (extrinsic muscles of the back: arranged into layers (3, primarily involved with movements of the upper limb. Innervated by branches of anterior rami of spinal nerves: note: exception = trapezius (cranial nerve 11: spinal accessory) When the scapula is fixed: trapezius contributes to bilateral cervical extension, ipsilateral lateral flexion and contralateral rotation of the cervical spine (direction of contraction is opposite think origin to insertion) Latissimus dorsi contributes to extension and lateral flexion of the lumbar spine. Medial boarder of scapula (minor superior to major) Contribute slightly to elevation and downward rotation of the scapula. Deep muscles of the back (intrinsic muscles of the back: arranged into layers (3): superficial (splenius), intermediate (erector spinae), deep (transversospinal and minor deep muscles, primarily involved with movements of the vertebral column.
