Читать книгу Essentials of Veterinary Ophthalmology - Kirk N. Gelatt - Страница 26

The extraocular muscles (EOM) arise from mesoderm in somitomeres (i.e., preoptic mesodermal condensations). Spatial organization of developing eye muscles is initiated before they interact with the neural crest mesenchyme. From studies of chick embryos, it has been shown that the oculomotor‐innervated muscles originate from the first and second somitomeres, the superior oblique muscle from the third somitomere, and the lateral rectus muscle from the fourth somitomere. The entire length of these muscles appears to develop spontaneously rather than from the orbital apex anteriorly.