Does the latissimus dorsi retract the scapula?
As the rhomboids and latissimus dorsi muscles create scapular retraction, they also produce scapular downward rotation. The ability of the trapezius muscle to upwardly rotate the scapula during retraction can counter this downward rotation, thereby keeping the scapula in a neutral upwardly/downwardly rotated position.
What action does latissimus dorsi perform?
Latissimus dorsi works collaboratively with the teres major and pectoralis major to perform actions of the upper extremity. Together, these muscles will work to adduct, medially rotate and extend the arm at the glenohumeral joint.
What muscles abduct the scapula?
The trapezius and serratus anterior muscles work in tandem to coordinate rotation and movement of the scapula to accommodate the full range of motion of the arm. Specifically, they facilitate abduction of the arm from 90 degrees and further upwards.
Does the latissimus dorsi flex the shoulder?
Background. Shoulder flexion requires an optimal length of the latissimus dorsi muscle in order to allow full lateral rotation of the humerus and upward scapular rotation. If shoulder flexion (in an externally rotated position) is restricted, this may predispose the individual to shoulder pathology.
Is the latissimus dorsi a skeletal muscle?
The word latissimus dorsi (plural: latissimi dorsi) comes from Latin and means “broadest [muscle] of the back”, from “latissimus” (Latin: broadest)’ and “dorsum” (Latin: back). The pair of muscles are commonly known as “lats”, especially among bodybuilders….Latissimus dorsi muscle.
| Latissimus dorsi | |
|---|---|
| FMA | 13357 |
| Anatomical terms of muscle |
Where are the lats muscles?
The latissimus dorsi muscle is a broad, flat muscle that occupies the majority of the lower posterior thorax. The muscle’s primary function is of the upper extremity but is also considered to be a respiratory accessory muscle.
What muscles are under the latissimus dorsi?
Triangles. The lateral margin of the latissimus dorsi is separated below from the obliquus externus abdominis by a small triangular interval, the lumbar triangle of Petit, the base of which is formed by the iliac crest, and its floor by the obliquus internus abdominis.
Why is the latissimus dorsi muscle important?
The latissimus dorsi muscle is a large, triangularly shaped back muscle that helps you do things like pull-ups, swimming and even breathing. It functions to stabilize your back while extending your shoulders.
What muscles support the scapula?
3 Specifically, the muscles of the scapula function as follows:
- Serratus Anterior. The serratus anterior is an important scapular stabilizing muscle.
- Rhomboids. The rhomboids (major and minor) function to stabilize the medial border of the scapula.
- Trapezius (Upper/Middle/Lower)
- Levator Scapulae.
- Normal Biomechanics.
Which of the following describes the latissimus dorsi muscle?
The latissimus dorsi muscle is a broad, flat muscle that occupies the majority of the lower posterior thorax. This muscle is able to pull the inferior angle of the scapula in various directions, producing movements on the shoulder joint (internal rotation, adduction and extension of the arm).
Where are the latissimus dorsi muscles?
What type of muscle is the latissimus dorsi?
type V muscle
Latissimus dorsi is a type V muscle with a single dominant and long vascular pedicle from the thoracodorsal artery at its insertion.
What does the latissimus dorsi muscle do?
The latissimus muscle is a member of the scapular motion muscle group. This muscle has the ability to pull the inferior angle of the scapula in various directions, resulting in shoulder joint movements such as internal rotation, adduction, and extension of the arm.
What nerve innervates the latissimus dorsi?
The innervation is carried by the thoracodorsal nerve (C6-C8), a branch of the brachial plexus. The latissimus dorsi supports various different movements of the shoulder. Due to the crossing over of the muscle fibers at the insertion point, the muscle’s contraction leads to an inward rotation of the humerus.
How is the fold of the latissimus dorsi accentuated?
The fold is accentuated when the arm is adducted against resistance. During this movement, it is possible to trace the whole inferolateral border of latissimus dorsi to its attachment to the iliac crest. The lower part of the lateral margin of the latissimus dorsi comprises the medial margin of the lumbar triangle (of Petit).
Is latissimus dorsi atrophy a global Mobiliser?
As mentioned previously, latissimus dorsi is a global mobiliser and has the structural characteristics of a global mobiliser, Therefore, the muscle will shorten, as in most cases a painful shoulder would be held in an arm by side position. Furthermore, the muscle will atrophy in the presence of pain or a lengthy period of poor positioning/posture.