Table 2. Comparative analysis of the flexor deep muscles forearm among C.l., human (Homo), chimpanzee (Pan) and baboon (Papio).

Muscle	Features	Cebus libidinosus	Homo	Pan	Papio
Pronator quadratus	Origin	Internal portion antero-lateral of the distal third of the ulna	Innervated by median nerveSomewhat similar to C.l. CAI = 0.375	Highly similar to C.l. CAI = 0.0	Highly similar to C.l. CAI = 0.0
	Insertion	Border antero-medial of the distal third of the radius
	Innervation	Ulnar nerve
	Vascularization	Ulnar artery
Flexor digitorum profundus	Origin	Proximal portion of the anterior surface of the ulna	Highly similar to C.l. CAI = 0.0	Not included tendon to index finger.Similar to C.l. CAI = 0.0625	Tendons from radial head to I, II and III fingers; and from ulnar head to III, IV and V fingers; associated with flexor digitorium superficial. To CAI purposes, it was considered inexistent.Dissimilar from C.l. CAI = 1.00
	Insertion	Base of the phalanges
	Innervation	Ulnar nerve
	Vascularization	Ulnar artery
Flexor pollicis longus	Origin	Medial epicondyle of the antero-medial surface of the radius	Also originates from the adjacent part of the interosseous membrane.Similar to C.l. CAI = 0.125	Highly similar to C.l. CAI = 0.0	Attached to belly of the flexor digitorum profundus muscle.Somewhat similar to C.l. CAI = 0.250
	Insertion	Distal phalange of the thumb and a tendon to index finger
	Innervation	Median nerve
	Vascularization	Ulnar artery
Deep muscles			Similar GCAI = 0.167	Similar GCAI = 0.020	Somewhat similar GCAI = 0.417