ĭue to this muscle's broad attachment on the spinous processes, ongoing research is looking at what, if any, role the muscle plays in trunk movement. As a result of this, people wearing calipers and using crutches can achieve a modified gait by fixing the arms and hitching the hips by alternative contraction of each latissimus dorsi. In people with paralysis of the lower half of the body, the fact that latissimus dorsi attaches to the pelvis and the fact that it is still innervated, enables the person to produce movement of the pelvis and trunk. With this action there is also a lifting of the pelvis. In activities such as walking with crutches, where the humerus becomes the fixed point when standing, latissimus dorsi has the ability to pull the trunk forwards relative to the arms. The attachment of the muscle to the inferior angle of the scapula allows this. The muscle assists in holding the scapula against the thorax during upper limb movements. During a cough or sneeze, the muscle can be felt pressing forcibly inward, as it acts to compress the thorax and abdomen. The muscle is also active in violent expiration, as it attaches to the ribs. It is an important muscle in rowing, swimming (especially during the downstroke) and chopping. With the arms fixed above the head, it can raise the trunk upwards, together with the help of pectoralis major. Research has also demonstrated that the latissimus dorsi is also active during deep inspiration and with forceful respiratory functions such as coughing and sneezing. The muscle is also active in moving the trunk forward and upward when the upper extremities are fixed overhead, as in climbing or performing an activity such as a chin up.
Latissimus dorsi, along with teres major and the sternal head of pectoralis major, is also active in the extension of the humerus.Įxtension and adduction will be strongest when the motion is started from a position of partial flexion or abduction or a combination of the two motions. Together, these muscles will work to adduct, medially rotate and extend the arm at the glenohumeral joint. Latissimus dorsi works collaboratively with the teres major and pectoralis major to perform actions of the upper extremity.
#LATISSIMUS DORSI STRETCH SKIN#
The skin covering the latissimus dorsi muscle is supplied by roots T4 to T12, inclusive by both ventral and dorsal rami, as well as the dorsal rami of L1 to 元. Thoracodorsal nerve (C6 – C8) from the posterior cord of the brachial plexus, which enters the muscle on its deep surface. Image: Latissimus dorsi muscle (highlighted in green) - posterior view The latissimus dorsi attachment on the intertubercular sulcus extends farther superiorly than does the attachment of the teres major on the lateral lip of the sulcus.As the muscle fibers extend toward the axilla, the fibers wind around the anterior aspect of the teres major muscle to insert as a flat tendon on the floor of intertubercular (bicipital) groove of humerus.The muscle fibers are situated in various orientations with the uppermost fibers almost horizontally oriented and the lower fibers much more vertically oriented on the thorax. Other attachments of the muscle include the posterior iliac crest, lower three to four ribs where it interdigitates with the external oblique muscle and inferior angle of the scapula.Through the thoracolumbar fascia latissimus dorsi attaches to the lumbar and sacral spinous processes (T6 to S5 levels), and the supraspinous ligament.
The lower six thoracic vertebral spinous processes anterior to the attachment of the trapezius on the spinous processes.
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