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Latissimus dorsi muscle

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Latissimus dorsi muscle

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Latissimus dorsiLatissimus dorsi originates from the mid to lower backMuscles connecting the upper extremity to the vertebral column.DetailsOriginSpinous processes of vertebrae T7-L5, thoracolumbar fascia, iliac crest, inferior 3 or 4 ribs and inferior angle of scapulaInsertionFloor of intertubercular groove of the humerusArteryThoracodorsal branch of the subscapular arteryNerveThoracodorsal nerve (C6, C7, C8)ActionsAdducts, extends and internally rotates the arm when the insertion is moved towards the origin. When observing the muscle action of the origin towards the insertion, the lats are a very powerful rotator of the trunk.AntagonistDeltoid and trapezius muscleIdentifiersLatinMusculus latissimus dorsiTA98A04.3.01.006TA22231FMA13357Anatomical terms of muscle

The latissimus dorsi (/ləˈtɪsɪməs ˈdɔːrsaɪ/) is a large, flat muscle on the back that stretches to the sides, behind the arm, and is partly covered by the trapezius on the back near the midline. 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. The latissimus dorsi is the largest muscle in the upper body.

The latissimus dorsi is responsible for extension, adduction, transverse extension also known as horizontal abduction (or horizontal extension),[1] flexion from an extended position, and (medial) internal rotation of the shoulder joint. It also has a synergistic role in extension and lateral flexion of the lumbar spine.

Due to bypassing the scapulothoracic joints and attaching directly to the spine, the actions the latissimi dorsi have on moving the arms can also influence the movement of the scapulae, such as their downward rotation during a pull up.

Structure

Variations
Axillary arches shown from two different angles.

The number of dorsal vertebrae to which it is attached varies from four to eight; the number of costal attachments varies; muscle fibers may or may not reach the crest of the ilium.

A muscular slip, the axillary arch, varying from 7 to 10 cm in length, and from 5 to 15 mm in breadth, occasionally springs from the upper edge of the latissimus dorsi about the middle of the posterior fold of the axilla, and crosses the axilla in front of the axillary vessels and nerves, to join the under surface of the tendon of the pectoralis major, the coracobrachialis, or the fascia over the biceps brachii. This axillary arch crosses the axillary artery, just above the spot usually selected for the application of a ligature, and may mislead a surgeon. It is present in about 7% of the population and may be easily recognized by the transverse direction of its fibers. Guy et al. extensively described this muscular variant using MRI data and positively correlated its presence with symptoms of neurological impingement.[2]

A fibrous slip usually passes from the upper border of the tendon of the Latissimus dorsi, near its insertion, to the long head of the triceps brachii. This is occasionally muscular, and is the representative of the dorsoepitrochlearis brachii of apes.[3][4] This muscular form is found in ~5% of humans and is sometimes termed the latissimocondyloideus.[5]

The latissimus dorsi crosses the inferior angle of the scapula. A study found that, of 100 cadavers dissected:[6]

43% had “a substantial amount” of muscular fibers in the latissimus dorsi originating from the scapula.
36% had few or no muscular fibers, but a “soft fibrous link” between the scapula and the latissimus dorsi
21% had little or no connecting tissue between the two structures.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.
Another triangle is situated behind the scapula. It is bounded above by the trapezius, below by the latissimus dorsi, and laterally by the vertebral border of the scapula; the floor is partly formed by the rhomboideus major. If the scapula is drawn forward by folding the arms across the chest, and the trunk bent forward, parts of the sixth and seventh ribs and the interspace between them become subcutaneous and available for auscultation. The space is therefore known as the triangle of auscultation.
The latissimus dorsi can be remembered best for insertion as “A Miss Between Two Majors”. As the latissimus dorsi inserts into the floor of the intertubercular groove of the humerus it is surrounded by two major muscles. The teres major inserts medially on the medial lip of the intertubercular groove and the pectoralis major inserts laterally onto the lateral lip.Nerve supply

The latissimus dorsi is innervated by the sixth, seventh, and eighth cervical nerves through the thoracodorsal (long subscapular) nerve. Electromyography suggests that it consists of six groups of muscle fibres that can be independently coordinated by the central nervous system.[7]

Function

The latissimus dorsi assists in depression of the arm with the teres major and pectoralis major. It adducts, extends, and internally rotates the shoulder. When the arms are in a fixed overhead position, the latissimus dorsi pulls the trunk upward and forward.[8]

It has a synergistic role in extension (posterior fibers) and lateral flexion (anterior fibers) of the lumbar spine, and assists as a muscle of both forced expiration (anterior fibers) and an accessory muscle of inspiration (posterior fibers).[9]

Most latissimus dorsi exercises concurrently recruit the teres major, posterior fibres of the deltoid, long head of the triceps brachii, among numerous other stabilizing muscles. Compound exercises for the ‘lats’ typically involve elbow flexion and tend to recruit the biceps brachii, brachialis, and brachioradialis for this function. Depending on the line of pull, the trapezius muscles can be recruited as well; horizontal pulling motions such as rows recruit both latissimus dorsi and trapezius heavily.

Training

The power/size/strength of this muscle can be trained with a variety of different exercises. Some of these include:

Vertical pulling movements such as pull-downs and pull-ups (including chin-ups).
Horizontal pulling movements such as bent-over row, T-bar row and other rowing exercises.
Shoulder extension movements with straight arms such as straight-arm lat pulldowns and Pull-overs.
Deadlift.

Clinical significance

Tight latissimus dorsi has been shown to be a contributor to chronic shoulder pain and chronic back pain.[10] Because the latissimus dorsi connects the spine to the humerus, tightness in this muscle can manifest as either sub-optimal glenohumeral joint (shoulder) function which leads to chronic pain or tendinitis in the tendinous fasciae connecting the latissimus dorsi to the thoracic and lumbar spine.[11]

The latissimus dorsi is a potential source of muscle for breast reconstruction surgery after mastectomy (e.g. Mannu flap) [12] or to correct pectoral hypoplastic defects such as Poland’s syndrome.[13][14] An absent or hypoplastic latissimus dorsi can be one of the associated symptoms of Poland’s syndrome.[15][16]

Cardiac support

For heart patients with low cardiac output and who are not candidates for cardiac transplantation, a procedure called cardiomyoplasty may support the failing heart. This procedure involves wrapping the latissimus dorsi muscles around the heart and electrostimulating them in synchrony with ventricular systole.

Injury

Injuries to the latissimus dorsi are rare. They occur disproportionately in baseball pitchers. Diagnosis can be achieved by visualization of the muscle and movement testing. MRI of the shoulder girdle will confirm the diagnosis. Muscle belly injuries are treated with rehabilitation while tendon avulsion injuries can be treated surgically, or with rehab. Regardless of treatment, patients tend to return to play without any functional losses.[17]

Additional images

Position of the latissimus dorsi muscle (shown in red). Animation.

Animation. Rib cage is not shown, except for 10th rib, 11th rib and 12th rib.

Lumbar triangle

Latissimus dorsi

Clearly visible latissimus dorsi muscle of an artistic gymnast on pommel horse.

Contraction of the latissimus dorsi muscle of another artistic gymnast on still rings.

See also

Wikimedia Commons has media related to Latissimus dorsi muscles.This article uses anatomical terminology.
Muscle energy techniques

References

This article incorporates text in the public domain from the 20th edition of Gray’s Anatomy (1918)

^ Kinematic Concepts for Analyzing Human Motion. In: Hall SJ. eds. Basic Biomechanics, 7e. McGraw-Hill; Accessed January 25, 2021. https://accessphysiotherapy-mhmedical-com.libaccess.lib.mcmaster.ca/content.aspx?bookid=1586&sectionid=99981270

^ .mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:”\”””\”””‘””‘”}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:linear-gradient(transparent,transparent),url(“//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg”)right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:linear-gradient(transparent,transparent),url(“//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg”)right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:linear-gradient(transparent,transparent),url(“//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg”)right 0.1em center/9px no-repeat}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:linear-gradient(transparent,transparent),url(“//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg”)right 0.1em center/12px no-repeat}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}Guy, MS; Sandhu, SK; Gowdy, JM; Cartier, CC; Adams, JH (January 2011). “MRI of the axillary arch muscle: prevalence, anatomic relations, and potential consequences”. AJR Am J Roentgenol. 196 (1): W52–7. doi:10.2214/ajr.10.4380. PMID 21178031.

^ Haninec, P; Tomás, R; Kaiser, R; Cihák, R (2009). “Development and clinical significance of the musculus dorsoepitrochlearis in men”. Clin. Anat. 22 (4): 481–8. doi:10.1002/ca.20799. PMID 19373904.

^ Edwards, William E., The Musculoskeletal Anatomy of the Thorax and Brachium of an Adult Female Chimpanzee,6571st Aeromedical Research Laboratory, New Mexico, 1965. [1]

^ “Anatomy Atlases: Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System: Alphabetical Listing of Muscles: L:Latissimus Dorsi”. www.anatomyatlases.org.

^ Giacomo, Giovanni Di; Pouliart, Nicole; Costantini, Alberto; Vita, Andrea de (September 25, 2008). Atlas of Functional Shoulder Anatomy. Springer Science & Business Media. ISBN 9788847007598.

^ Brown, JM; Wickham, JB; McAndrew, DJ; Huang, XF (2007). “Muscles within muscles: Coordination of 19 muscle segments within three shoulder muscles during isometric motor tasks”. J Electromyogr Kinesiol. 17 (1): 57–73. doi:10.1016/j.jelekin.2005.10.007. PMID 16458022.

^ George, Michael S.; Khazzam, Michael (February 2019). “Latissimus Dorsi Tendon Rupture”. Journal of the American Academy of Orthopaedic Surgeons. 27 (4): 113–118. doi:10.5435/JAAOS-D-17-00581. ISSN 1067-151X. PMID 30278013. S2CID 52910621.

^ Kendall, Florence Peterson; McCreary, Elizabeth Kendall; Provance, Patricia Geise (2005). Muscles Testing and Function With Posture and Pain. p. 238. ISBN 9780781747806.

^ Arnheim, D.D., Prentice, W.E., Principles of athletic training. 9th ed. McGraw Hill, pp 570-574, 1997.

^ Francis, P., Applied anatomy and kinesiology, supplemental materials. KB Books., p 19-25, 1999.

^ Mannu, G. S., Farooq, N., Down, S., Burger, A. and Hussien, M. I. (2013), Avoiding back wound dehiscence in extended latissimus dorsi flap reconstruction. ANZ J Surg, 83: 359–364. http://onlinelibrary.wiley.com/doi/10.1111/j.1445-2197.2012.06292.x/full

^ Yang CE, Roh TS, Yun IS, Kim YS, Lew DH (2014). “Immediate partial breast reconstruction with endoscopic latissimus dorsi muscle flap harvest”. Arch Plast Surg. 41 (5): 513–9. doi:10.5999/aps.2014.41.5.513. PMC 4179355. PMID 25276643.

^ Lantzsch T, Lampe D, Kantelhardt EJ (2013). “Correction of Poland’s Syndrome: Case Report and Review of the Current Literature”. Breast Care (Basel). 8 (2): 139–42. doi:10.1159/000350778. PMC 3683949. PMID 24419214.

^ Masia J, Pons G, Loschi P, Sanchez Porro-Gil L, Nardulli ML, Olivares L (2015). “Autologous reconstruction of a complex form of Poland syndrome using 2 abdominal perforator free flaps”. Ann Plast Surg. 74 (5): 580–3. doi:10.1097/SAP.0b013e31829a39b1. PMID 24322640.

^ Beer GM, Kompatscher P, Hergan K (1996). “Poland’s syndrome and vascular malformations”. Br J Plast Surg. 49 (7): 482–4. doi:10.1016/S0007-1226(96)90037-5. PMID 8983554.

^ Donohue, Benjamin; Lubitz, Marc (December 20, 2016). “Sports Injuries to the Latissimus Dorsi and Teres Major”. The American Journal of Sports Medicine. 45 (10): 2428–2435. doi:10.1177/0363546516676062. PMID 28125914. S2CID 3872258.

External links

Anatomy figure: 01:03-08 at Human Anatomy Online, SUNY Downstate Medical Center – “Superficial layer of the extrinsic muscles of the back.”
Cross section image: pembody/body8a—Plastination Laboratory at the Medical University of ViennavteMuscles of the thorax and backBacksplenius
capitis
cerviciserector spinae
iliocostalis
longissimus
spinalisTransversospinales
semispinalis
multifidus
rotatores
interspinales
intertransversariiVertebral column
trapezius
latissimus dorsi
rhomboid
major
minor
levator scapulaeFascia
thoracolumbar fasciaThorax
Intercostal muscle
external
internal
innermost
subcostalis
transversus thoracis
levatores costarum
serratus posterior
inferior
superior
thoracic diaphragmThoracic cavity
pectoralis major
pectoralis minor
subclavius
serratus anterior
sternalisFascia
pectoral fascia
clavipectoral fascia

Authority control
MA: 2780552095, 2909529048
TA98: A04.3.01.006

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Latissimus dorsi injury | Radiology Reference Article

Latissimus dorsi injury | Radiology Reference Article – The latissimus dorsi plays an important role in internal rotation power during the late cocking and acceleration phase of the throwing movement 1,2. A tear of the latissimus dorsi muscle is a discontinuity of muscle or tendon fibers usually at the site of insertion or myotendinous junction. MechanismLatissimus Dorsi Origin and Insertion: You can see in the image below the Latissimus Dorsi Origin and Insertion. The origin spans a large portion of the spine, from lumber 5 [L5 to Thoracic 7 [T7]. All muscles attach to a bone via a tendon, the tendon of the Latissimus Dorsi is also known as the thoracolumbar aponeurosis. This is a sheet ofThe latissimus dorsi muscle (AKA: 'the lats muscle' or 'the lats') is the widest muscle in the human body. It is relatively thin and covers almost all back muscles at the posterior trunk, except the trapezius.

Latissimus Dorsi Origin and Insertion – L3 Anatomy and – The latissimus dorsi is the larger, flat, dorso-lateral muscle on the trunk, posterior to the arm, and partly covered by the trapezius on its median dorsal region. Origin of the latissimus dorsi is from spinous processes of thoracic T7-T12, thoracolumbar fascia, iliac crest and inferior 3 or 4 ribs, …The latissimus dorsi inserts _____. on the intertubercular groove of the humerus. One of the actions of the latissimus dorsi muscle is to _____. adduct the arm. The origins of the levator scapula are from the _____ of four cervical vertebrae. transverse processes. The entire length of longissimus muscle extends from the mastoid process of theOrigin of the latissimus dorsi is from spinous processes of thoracic T7-T12, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs, inferior angle of scapula and insertion on the floor of intertubercular groove of the humerus. The latissimus dorsi may be used for tendon graft surgeries. Comments (0)

Latissimus Dorsi Origin and Insertion - L3 Anatomy and

Latissimus dorsi: Origin, insertion, innervation,function – The latissimus dorsi has a complex origin and a simple insertion. The origin of the lats is at several places, including at the top of the back from the bottom six thoracic vertebrae and the last three or four ribs.To insert on the posterior side of the humerus of the upper arm, latissimus dorsi runs obliquely, superiorly and laterally through the back and armpits. As the latissimus dorsi gets closer to its insertion point, the muscular fibers from its origins merge to a point, defining its triangular shape.Latissimus Dorsi Muscle Origin: Spinous processes of vertebrae T7-T12, Thoracolumbar fascia, Posterior third of crest of ilium, Ribs 9-12, Inferior angle of scapula Insertion: Intertubercular groove of the humerus

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