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Green iguana has arboreal and terrestrial habits. It is widely distributed in Central and South America, inhabiting several biomes in Brazil. Some researches were focused on this species, however, morphological information are still limited. With that in sight, we aimed to add data to the anatomical knowledge. Two post mortem specimen of Iguana i. iguana were acquired, donated by a scientific breeding, and dissected. To describe the muscles we refuted the skin and removed the fascias, individualizing the muscles. We identified the following muscles: pectoralis, deltoideus clavicularis, deltoideus scapularis, trapezius, latissimus dorsi, coracobrachialis brevis, coracobrachialis longus, serratus thoracis, levator scapulae, biceps brachii and triceps brachii. Some of them, like coracobrachialis brevis, present conservative anatomy, originating from the ventral surface of the coracoid and inserting onto the proximal humerus. Some, like trapezius and biceps brachii, are similar to other reptile species, trapezius takes its origin from the thoracodorsal fascia and biceps arises by two heads and inserts on the radial tuberosity. Deltoideus clavicularis and deltoideus scapularis share a common insertion tendon. Pectoralis varies its origin and divisions, however, the insertion always occur on the deltopectoral crest. Triceps brachii is comprised of four heads. Its long medial head originates via a tendinous arc, feature described only in crocodilians. We conclude that Iguana i. iguana forelimb musculature is similar to other reptiles, presenting its own characteristics that reflect its habits.

Muscular anatomy of the pectoral girdle and forelimb of Iguana i. iguana (Squamata: Iguanidae)