Table 5. The review of the literature on the frequency of unilateral and bilateral cadaveric presentation of the digastric muscle variations^a).

Study	No. of cadavers with			Overall (unilateral+bilateral)
	Unilateral presentation		Bilateral presentation
	Left	Right
Yamada [5]; fetus	15	17	12	44
Yamada [5]	4	9	15	28
Yamada [46]	2	3	9	14
Mori [8]	37	31	73	141
Komatsu et al. [47]	0	0	2	2
Sato et al. [48]	0	0	1	1
Sargon and Celik [19]	0	1	0	1
Andreo et al. [50]	1	2	2	5
Sarikcioglu et al. [20]	0	0	1	1
Holibková and Machálek [21]	1	0	1	2
Sargon et al. [22]	0	0	5	5
Peker et al. [23]	0	0	1	1
Guelfguat et al. [24]	0	1	0	1
Mascaro et al. [51]	0	0	1	1
Yüksel and Yüksel [25]	0	0	1	1
Celik et al. [26]	1	0	0	1
Aktekin et al. [27]	0	0	1	1
De-Ary-Pires et al. [9]	15 (side unspecified)		5	20
Fujimura et al. [28]	0	0	1	1
Sakamoto and Akita [52]	3	0	7	10
Turan-Ozdemir et al. [29]	0	0	1	1
Loukas et al. [30]	0	0	1	1
Ozgursoy and Kucuk [31]	1 (posterior belly)	0	0	1
Bakirci et al. [32]	0	0	2	2
Liquidato et al. [43]	0	0	2	4
Ozgur et al. [33]	0	2	1	1
Reyes et al. [34]	0	0	1	1
Kim et al. [12]	3 (side unspecified)		5	8
Mehta et al. [35]	0	0	1 (posterior belly)	1
Ozgur et al. [44]	1	0	19	20
Kyung et al. [36]	0	0	1	1
Yamazaki et al. [37]	0	0	1	1
Kalniev et al. [13]	0	0	1	1
Quadros et al. [38]	1	0	0	1
Rani et al. [39]	0	0	1	1
Total	67	66	175	326
	21%	20%
	151 (unspecified unilateral variations included)
	46%		54%	100%

^a)Unless specified as the variation of the posterior belly, the variation denotes the variation of the anterior belly of the digastric muscle.