Table 1. Comparative analyses of the flexor superficial muscles forearm among Cebus libidinosus (C.l.), human (Homo), chimpanzee (Pan) and baboon (Papio).

Muscle	Features	Cebus libidinosus	Homo	Pan	Papio
Flexor carpi ulnaris	Origin	Medial epicondyle of humerus and olecranon	Highly similar to C.l. CAI = 0.0	Highly similar to C.l. CAI = 0.0	Highly similar to C.l. CAI = 0.0
	Insertion	Pisiform bone
	Innervation	Ulnar nerve
	Vascularization	Ulnar artery
Palmaris longus	Origin	Medial epicondyle of humerus	Variable, may be absentSomewhat similar to C.l. CAI = 0.425	Highly similar to C.l. CAI = 0.0	Highly similar to C.l. CAI = 0,0
	Insertion	Palmar aponeurosis
	Innervation	Median nerve
	Vascularization	Ulnar artery
Flexor carpi radialis	Origin	Medial epicondyle of humerus	Similar to C.l.Vascularized by radial arteryCAI = 0.125	Double insertion in metacarpal II and IIISomewhat similar to C.l. CAI = 0.250	Highly similar to C.l. CAI = 0.0
	Insertion	Base of metacarpal II
	Innervation	Median nerve
	Vascularization	Ulnar artery
Flexor digitorum superficialis	Origin	Humeral head – medial epicondyle of the humerus; Radial head – anterior surface of the radius	Three heads of origin – humeral, radial and ulnar.Somewhat similar to C.l. CAI = 0.375	Highly similar to HomoSomewhat similar to C.l. CAI = 0.375	Highly Similar to C.l. CAI = 0.0
	Insertion	Middle phalanges of II to V fingers
	Innervation	Median nerve
	Vascularization	Ulnar artery and branches of the radial artery
Pronator teres	Origin	Medial epicondyle of humerus	Two heads of origin, humeral and ulnarSomewhat similar to C.l. CAI = 0.375	Highly similar to HomoSomewhat similar to C.l. CAI = 0.375	Highly similar to C.l. CAI = 0.0
	Insertion	Postero-lateral portion of the radius
	Innervation	Median nerve
	Vascularization	Ulnar artery
Superficial group			Somewhat similarGCAI = 0.26	Similar GCAI = 0.20	Highly similar GCAI = 0.0