Dorsoepitrochlearis muscle: an unknown cause of shoulder motion limitation and axilla deformity

Natsis, Konstantinos; Totlis, Trifon; Vlasis, Konstantinos; Sofidis, Georgios; Lazaridis, Nikolaos; Tsitouridis, Ioannis

doi:10.1007/s00776-011-0079-6

Cited by 6 publications

(6 citation statements)

References 8 publications

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“…The DET inserts onto the olecranon and the fascia of Bb and Tb in all macaques (6/6) and some gibbons (3/8), but in most gibbons it inserts via a tendon sheet onto the medial epicondyle of the humerus (5/8). The DET, clearly present in both macaques and gibbons, is rarely seen in humans (Cheng and Scott, 2000) as fewer than 30 cases have been reported over the past 200 years (Natsis et al, 2012). The function of the DET is still debated.…”

Section: Upper Arm Musculaturementioning

confidence: 99%

The forearm and hand musculature of semi‐terrestrial rhesus macaques (Macaca mulatta) and arboreal gibbons (Fam. Hylobatidae). Part I. Description and comparison of the muscle configuration

2020

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Primates live in very diverse environments and, as a consequence, show an equally diverse locomotor behaviour. During locomotion, the primate hand interacts with the superstrate and/or substrate and will therefore probably show adaptive signals linked with this locomotor behaviour. Whereas the morphology of the forearm and hand bones have been studied extensively, the functional adaptations in the hand musculature have been documented only scarcely. To evaluate whether there are potential adaptations in forelimb musculature to locomotor behaviour, we investigated the forearm and hand musculature of the highly arboreal gibbons (including Hylobates lar, Hylobates pileatus, Nomascus leucogenys, Nomascus concolor, Symphalangus syndactylus) and compared this with the musculature of the semi‐terrestrial rhesus macaques (Macaca mulatta) by performing complete and detailed dissections on a sample of 15 unembalmed specimens. We found that the overall configuration of the upper arm and hand musculature is highly comparable between arboreal gibbons and semi‐terrestrial macaques, and follows the general primate condition. Most of the identified differences in muscle configuration are located in the forearm. In macaques, a prominent m. epitrochleoanconeus is present, which potentially helps to extend the forearm and/or stabilize the elbow joint during quadrupedal walking. The m. flexor carpi radialis shows a more radial insertion in gibbons, which might be advantageous during brachiation, as it can aid radial deviation. The fingers of macaques are controlled in pairs by the m. extensor digiti secondi et tertii proprius and the m. extensor digiti quarti et quinti proprius—a similar organization can also be found in their flexors—which might aid in efficient positioning of the hand and fingers on uneven substrates during quadrupedal walking. In contrast, extension of the little finger in gibbons is controlled by a separate m. extensor digiti minimi, whereas digits 2 to 4 are extended by the m. extensor digitorum brevis, suggesting that simultaneous extension of digits 2–4 in gibbons might be important when reaching or grasping an overhead support during brachiation. In conclusion, the overall configuration of the forelimb and hand musculature is very similar in gibbons and macaques, with some peculiarities which can be linked to differences in forelimb function and which might be related to the specific locomotor behaviour of each group.

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Section: Upper Arm Musculaturementioning

confidence: 99%

The forearm and hand musculature of semi‐terrestrial rhesus macaques (Macaca mulatta) and arboreal gibbons (Fam. Hylobatidae). Part I. Description and comparison of the muscle configuration

2020

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“…An accessory subscapularis-teres-latissimus dorsi muscle has been described (Kameda 1976). It may be present in 5% of the population, although this rate of occurrence is disputed (Natsis et al 2012). It may be present in 5% of the population, although this rate of occurrence is disputed (Natsis et al 2012).…”

Section: Figure 3011mentioning

confidence: 99%

“…D, dorsoepitrochlearis muscle; LD, latissimus dorsi muscle; PM, pectoralis major muscle; PMI, pectoralis minor muscle; BB, biceps brachii muscle; TM, teres major muscle; SB, subscapularis muscle.Source:Natsis et al (2012). (b) MRI of same patient.…”

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confidence: 99%

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Bakkum

Miller

2016

Bergman's Comprehensive Encyclopedia of Human Anatomic Variation

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“…Although it is thought to be innervated by the thoracodorsal nerve, earlier reports mention the innervation by radial nerve as well [ 12 , 16 ]. This muscle may rarely even limit the motion in the shoulder joint and is visible and palpable in the axilla [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Anatomical variants complicating the posterior approaches towards the elbow joint

et al. 2023

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Introduction Anatomical variants observed during the posterior approach to the elbow joint require special attention due to their clinical relevance. We aim to present a compendious review of described variants potentially encountered during the posterior approach towards the elbow joint to the experts in the elbow surgery. Methods A narrative review of surgical and anatomical textbooks, as well as search of scientific databases was carried out. Results Variability of the subcutaneous nerves is important during incision planning. Accessory muscles such as dorsoepitrochlearis, chondroepitrochlearis, epitrochleoanconeus, subanconeus or supernumerary flexor carpi ulnaris may confuse even the senior surgeon during the dissection and possibly complicate the fracture reduction. Some bony variants such as supratrochlear foramen may lead to fracture or possibly interfere with the osteosynthesis placement. Accessory bones are also present in the region of the elbow joint. Those situated intra-articular may present with symptoms. Conclusion Many variants can be encountered in the area of the elbow joint and their knowledge is essential to truly understand its anatomy. The presented review enables easier orientation in the current literature with the aim on the posterior approach towards the elbow joint.

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Dorsoepitrochlearis muscle: an unknown cause of shoulder motion limitation and axilla deformity

Cited by 6 publications

References 8 publications

The forearm and hand musculature of semi‐terrestrial rhesus macaques (Macaca mulatta) and arboreal gibbons (Fam. Hylobatidae). Part I. Description and comparison of the muscle configuration

The forearm and hand musculature of semi‐terrestrial rhesus macaques (Macaca mulatta) and arboreal gibbons (Fam. Hylobatidae). Part I. Description and comparison of the muscle configuration

Back Muscles

Anatomical variants complicating the posterior approaches towards the elbow joint

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