Origin and Etymology of rectus
New Latin, from rectus musculus straight muscle
First Known Use: 1615
Medical Definition of rectus
1: any of several straight muscles (as the rectus abdominis or the rectus femoris)
2: any of four extraocular muscles of the eyeball that arise from the border of the optic foramen and run forward to insert into the sclera of the eyeball:a: one that is the thinnest and narrowest and inserts into the superior aspect of the sclera—called also rectus superior, superior rectusb: one that is the longest, arises by two heads, and inserts into the lateral aspect of the sclera—called also lateral rectus, rectus lateralisc: one that is the broadest and inserts into the medial aspect of the sclera—called also medial rectus, rectus medialisd: one that inserts into the inferior aspect of the sclera—called also inferior rectus, rectus inferior
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