Frequency of the musculus palmaris longus studied in vivo in some Amazon Indians

Abstract

The frequency of the Musclus palmaris longus was studied by observing its tendon in vivo in 379 Amazon Indians belonging to the following tribes: Tucano, Tariana, Tiriyo, Desana, Piratapuya, Macu and Arapaso. The muscle was not observed in 14 individuals (3.7% ± 1.0) either unilaterally or bilaterally and in 24 of 758 limbs (3.1% ± 0.6). No statistically significant difference was observed in the frequency of the muscle among the different tribes. Bilateral absence was significantly more frequent than the unilateral one; absence in females was more frequent than in males. The frequency of palmaris longus agenesis in Amazon Indians agrees with reported values for Negroids and Mongoloids and is considerably lower than that generally reported for the Caucasoids.

Evaluation of Relationship Between Prevalence of Palmaris Longus Muscle and Handedness in Turkish Population

“…The right absence of PL was 2 % in Amazon Indians (Machado & Di Dio, 1967), although this ratio was low, it was close to the results of Mbaka & Ejiwunmi (2009) (2.5%) and Kapoor et al (3 %) studies. The right absence was found as 11.9 % and 10.2 % in the Iranian and Egyptian populations, respectively (Abdolahzadeh Lahiji et al, 2013;Raouf et al).…”

Study of Frequency of the Palmaris Longus Musclem in Chilean Subjects

“…In other ethnic groups lower percentages of agenesis could be observed, 3.7% among the Amazon natives of the South America (Machado & DiDio, 1967), 4.6% for the Chinese (Sebastin et al), 1.5% for African black (Gangata), 11.5% in South Africans miscegenated (Ndou et al, 2010) and 36.8% for the Bahraini population in the Arabian Gulf (Sater et al, 2010). Among the Indian population, Kapoor et al found 17.2% of total agenesis, a value close to the one found by Agarwal (2010), which was 20.2% in a recent study with Indians.…”

Clinical Study of Absence of the Palmaris Longus and Its Correlation With Other Anatomical Anomalies

“…Unilateral agenesis was seen in 76 (15.2%) and bilateral [12]. The prevalence of absence of PL in the Chinese populace was 4.6% (bilateral 1.2% and unilateral 3.3%) [13]. While the prevalence of absence of PL on both unilaterally and bilaterally was 26.6% in Turkish subjects.…”