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Teres major muscle – insertion footprint

View Article: PubMed Central - PubMed

ABSTRACT

Teres major muscle (TM) and latissimus dorsi muscle (LD) are frequently used in muscle transfers around the shoulder girdle. Some authors have suggested harvesting techniques in which the muscle is detached in continuity with a bone segment. Information on the bony attachment footprint of these muscles is lacking. The purpose of this study was to investigate the region of attachment of the TM to facilitate safe and complete harvesting with a bone segment where it is indicated, and to determine the relationship of the TM footprint with that of the LD. Twenty‐eight upper extremities of 14 human cadavers (six female, eight male) were investigated during the students’ dissection course in the winter term 2012. The attachment footprints were photographed and the images were processed with imageJ Version 1.46r. The TM attachment footprint at the crest of the lesser tubercle had an average dimension of 187 ± 89 mm2. It was 49.6 ± 7.9 mm long and 7.4 ± 2.5 mm wide. The bony attachment of the LD within the bicipital groove, just below the tendon of the long head of the biceps muscle, had an area of 94 ± 37 mm2. It was 36.5 ± 8 mm long and 3.7 ± 1.2 mm wide. Both muscles were separated by 4.4 ± 1.7 mm and their attachments overlapped in the craniocaudal direction by 24.4 ± 12.4 mm. Earlier studies have investigated the dimensions of the muscles’ tendons close to the attachment not the bony attachment itself. The dimension of the attachment of the TM was larger than that of the LD. The ratio between the footprint areas was approximately 2:1. This information should be considered by surgeons undertaking transfers, which include a bony segment of the muscle insertion.

No MeSH data available.


Related in: MedlinePlus

Additional head – teres major accessorius muscle. Two left specimens, presenting the teres major accessorius muscle (TMacc). The teres major muscle (TM) is still attached to the humeral bone but cut and turned laterally. The additional head is visible on the posterior surface within the proximal third. The separate insertion and the short tendon in comparison to the TM's main tendon can especially be seen in the right picture.
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joa12593-fig-0004: Additional head – teres major accessorius muscle. Two left specimens, presenting the teres major accessorius muscle (TMacc). The teres major muscle (TM) is still attached to the humeral bone but cut and turned laterally. The additional head is visible on the posterior surface within the proximal third. The separate insertion and the short tendon in comparison to the TM's main tendon can especially be seen in the right picture.

Mentions: In half of the specimens the attachment footprint of the TM was particularly wide at its proximal part. The footprint did not increase in width continuously: there was an abrupt increase in width similar to an edge between the main body of the TM attachment and the cranial, larger component. This was clearer when the TM was turned laterally. Medial to the proximal third of the TM tendon lay a strand of muscular fibers of considerable thickness that was attached to the humerus separately by a very short tendon (< 3 mm; Fig. 4).


Teres major muscle – insertion footprint
Additional head – teres major accessorius muscle. Two left specimens, presenting the teres major accessorius muscle (TMacc). The teres major muscle (TM) is still attached to the humeral bone but cut and turned laterally. The additional head is visible on the posterior surface within the proximal third. The separate insertion and the short tendon in comparison to the TM's main tendon can especially be seen in the right picture.
© Copyright Policy - creativeCommonsBy-nc-nd
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382588&req=5

joa12593-fig-0004: Additional head – teres major accessorius muscle. Two left specimens, presenting the teres major accessorius muscle (TMacc). The teres major muscle (TM) is still attached to the humeral bone but cut and turned laterally. The additional head is visible on the posterior surface within the proximal third. The separate insertion and the short tendon in comparison to the TM's main tendon can especially be seen in the right picture.
Mentions: In half of the specimens the attachment footprint of the TM was particularly wide at its proximal part. The footprint did not increase in width continuously: there was an abrupt increase in width similar to an edge between the main body of the TM attachment and the cranial, larger component. This was clearer when the TM was turned laterally. Medial to the proximal third of the TM tendon lay a strand of muscular fibers of considerable thickness that was attached to the humerus separately by a very short tendon (< 3 mm; Fig. 4).

View Article: PubMed Central - PubMed

ABSTRACT

Teres major muscle (TM) and latissimus dorsi muscle (LD) are frequently used in muscle transfers around the shoulder girdle. Some authors have suggested harvesting techniques in which the muscle is detached in continuity with a bone segment. Information on the bony attachment footprint of these muscles is lacking. The purpose of this study was to investigate the region of attachment of the TM to facilitate safe and complete harvesting with a bone segment where it is indicated, and to determine the relationship of the TM footprint with that of the LD. Twenty&#8208;eight upper extremities of 14 human cadavers (six female, eight male) were investigated during the students&rsquo; dissection course in the winter term 2012. The attachment footprints were photographed and the images were processed with imageJ Version 1.46r. The TM attachment footprint at the crest of the lesser tubercle had an average dimension of 187&#8197;&plusmn;&#8197;89&#8197;mm2. It was 49.6&#8197;&plusmn;&#8197;7.9&#8197;mm long and 7.4&#8197;&plusmn;&#8197;2.5&#8197;mm wide. The bony attachment of the LD within the bicipital groove, just below the tendon of the long head of the biceps muscle, had an area of 94&#8197;&plusmn;&#8197;37&#8197;mm2. It was 36.5&#8197;&plusmn;&#8197;8&#8197;mm long and 3.7&#8197;&plusmn;&#8197;1.2&#8197;mm wide. Both muscles were separated by 4.4&#8197;&plusmn;&#8197;1.7&#8197;mm and their attachments overlapped in the craniocaudal direction by 24.4&#8197;&plusmn;&#8197;12.4&#8197;mm. Earlier studies have investigated the dimensions of the muscles&rsquo; tendons close to the attachment not the bony attachment itself. The dimension of the attachment of the TM was larger than that of the LD. The ratio between the footprint areas was approximately 2:1. This information should be considered by surgeons undertaking transfers, which include a bony segment of the muscle insertion.

No MeSH data available.


Related in: MedlinePlus