This is the Latissimus Dorsi PDF for you to download
Latissimus Dorsi is a large, flat, triangular shaped muscle with a massive proximal attachment.
Latissimus Dorsi has amazing movable attachments which has significant clinical relevance in the dog.
The canine Latissimus Dorsi has an important function in caudal core stability.
Using Therapeutic Handling / Alignment treatment techniques in the aquatic setting leads to noticeable improvement in the dog's caudal core and it's land based natural balanced stance, postures and motion.
The massive proximal attachment on the axial skeleton is through the thoracolumbar fascia (also known as lumbodorsal fascia in older texts). So via the thoracolumbar fascia, Latissimus Dorsi attaches to all the lumbar vertebrae and the last 9 or 10 thoracic vertebrae. It also attaches to the last few ribs by a couple of muscular slips.
The thoracolumbar fascia (deep fascia) has 2 leaves; superficial and deep.
The proximal attachment of Latissimus Dorsi begins as a wide tendinous leaf from the superficial leaf of the thoracolumbar fascia.
The apical end of the muscle (narrower cranial end) goes medial to the shoulder attaching as a conjoined tendon with the Teres Major muscle to the teres major tuberosity on the medial aspect of the humerus. This is roughly opposite to the deltoid tuberosity found on the lateral aspect of the humerus.
Innervation of Latissimus Dorsi
Latissimus Dorsi muscle is innervated by the thoracodorsal nerve which arises mainly from the 8th cervical nerve, with contributions for the 1st thoracic nerve and 7th cervical nerve.
This is the motor nerve to Latissimus Dorsi and it has no cutaneous branches.
Retraction in the stance phase is actually the power sweep of movement. The dog is a rear engine design and the pelvic limb muscles (hindlimb muscles) are where the dog primarily powers from. Whereas, the biomechanical design of the thoracic limbs (forelimbs) is primarily for braking and shock absorbing.
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