Extrinsic Superficial
Name the two muscles part of this group
Latissimus Dorsi and Trapezius
What are the actions of the trapezius muscle?
Upper Trapezius: scapular elevation and rotation
Middle Trapezius: scapular retraction
Lower Trapezius: scapular depression
What is the proximal and distal attachment of the latissimus dorsi?
Proximal Attachment: spinous process (T7-T12), thoracolumbar fascia, posterior third of iliac crest, ribs 9-12
Distal Attachment: floor of the intertubecular sulcus (humerus)
What is the proximal and distal attachment of the trapezius?
Proximal Attachment: superior nuchal line (medial third), nuchal ligament, external occipital protuberance, spinous process (C7-T12)
Distal Attachment: clavicle (lateral third), acromion and spine of scapula
What are the innervations of the latissimus dorsi and trapezius?
Latissimus Dorsi: thoracodorsal nerve
Trapezius: accessory nerve and cervical plexus (C3-C4)