Comparison of the Superior and Inferior Rectus Muscles in Humans: An Anatomical Study with Notes on Morphology, Anatomical Variations, and Intramuscular Innervation Patterns

Figure 7

Intramuscular arborization of the superior branch of the oculomotor nerve within the human right superior rectus muscle. View to the muscle’s internal (inferior) surface. Sihler’s stain.  mm. The muscle was expanded slightly to expose the detailed intramuscular innervation pattern. Muscular subbranches running within the muscle formed a characteristic tree-like branching pattern. The terminal plexus with tufty endings of muscular subbranches is visible near the muscle’s proximal half. The muscular branch (MB) to the levator palpebrae superioris muscle reaches the superior rectus muscle’s medial margin.