Fig. 2From: Harderian gland of flying and non-flying birds: morphological, histological, and histochemical studiesA photomacrograph of the eye showing anatomical dissection of the HG, eyeball (a), anterior extremity (b), posterior extremity (c), middle groove (d), excretory duct (e), and extraocular muscle (pyramidalis oculi) (f) in duck (A), goose (b), ibis (c), and pigeon (d)Back to article page