Agenesis of Palmaris Longus Muscle in Selected Population of School Children in Nigeria

Abstract

SUMMARY:The aim of this study is to evaluate the prevalence of agenesis of palmaris longus muscle tendon among school children in Ogun state, Southwestern Nigeria and also, to verify the symmetry of the agenesis of the muscle in relation to sex. The presence of the palmaris longus muscle tendon was determined in 564 individuals, 285 male and 279 female, with age varying from 2 to 20 years old. Four different tests were used; Schaeffer's test, Thompson's test, Mishra's test 1 and Pushpakumar's "two-finger sign" method. The data obtained were further analyzed statistically and the agenesis of palmaris muscle was found to be 26.7% (unilateral 13.0%; bilateral 13.7%). Prevalence was higher in female (32.3%) than male (21.4%) (P>0.05). Besides, we observed higher agenesis in the left side in female individuals. High prevalence of agenesis of palmaris muscle observed in the study population is similar to other previous reports in Southwestern Nigeria.

To Study the Prevalence of the Absence of Palmaris Longus in the Punjabi Population - An Institutional Study

“…14 If compared with populations of the world, similar prevalence was seen in Malayasian population 12 and much higher values in Nigerian population and of Brazil population. 16,17 This reaffirms that the prevalence of absence of the palmaris longus muscle shows a marked variation in different populations In our study absence was reported unilaterally in 7% of the students and bilaterally in 4.3% of the students which was similar to studies done in Malaysia and Kathmandu with which also showed high prevalence of absence of Palmaris longus unilaterally than bilaterally. 12,13 A study done in Andhra population of India also showed absence of unilateral agenesis more frequent than bilateral agenesis although unilateral frequency was quite high 70.5% as compared to other populations.…”

“…12,13 A study done in Andhra population of India also showed absence of unilateral agenesis more frequent than bilateral agenesis although unilateral frequency was quite high 70.5% as compared to other populations. 14 The literature on different races and population have showed left sided agenesis was more common in female than in male 16,17 as in our present study in which unilateral absence was 5.3% on left side and 1.6% on right side. Controversial findings have been reported by some researchers where right sided agenesis was found to be more than left sided agenesis in male.…”

Non-adaptive evolution of them. palmaris longusin the Homininae

“…2008) reported PLA of less than 20%, unsurprisingly indicating that a nation of over 1 billion humans exhibits regional variability. A similar pattern is found in the populous nation of Nigeria (Adejuwon et al . 2012, Kayode et al .…”

The palmaris longus muscle: A surface study of the population of North Cyprus

“…The tendon of PL muscle, an anterior forearm flexor muscle, is found at the level of the wrist lying between the tendons of the flexor carpi ulnaris and flexor carpi radialis Various studies have reported many different variations of the tendon of PL, especially its absence [3][4][5][20][21][22][23][24][25][26][27][28]. More studies have been conducted to establish a correlation of the absence of PL to body side, gender and hand dominance [6,29,[30][31][32].…”

“…A study in Van, Turkey recorded a total prevalence of 15.1% [7]. Higher prevalence of PL agenesis have been given in Chilean subjects as 21% [6] while it was 22.8% in Iran [4], 26.6% in Turkey [8], 26.7% in Nigeria [29], 28% in India [13], and 40.5% in Saudi Arabia [12]. A study conducted in the Gaziantep population of Turkey reported the highest prevalence as 63.9% [19].…”