Absence of muscle spindles in avian extraocular muscles.
D000818:Animals; D001717:Birds / Q000033:anatomy & histology*; D002171:Canaries; D010856:Columbidae; D009470:Muscle Spindles; D009541:Nictitating Membrane; D009801:Oculomotor Muscles / Q000033:anatomy & histology*; D013194:Staining and Labeling