"innervation: inferior branch of the oculomotor nerve (CN III)"
"origin: annulus of Zinn (tendinous ring)"
"insertion: globe (anterior, inferior surface)"
"primary function: one of two ocular depressors"
"secondary function: one of the two ocular external rotators"
"tertiary function: one of the three ocular adductors"
"Rectus comes from the Latin rectos, meaning straight 1."
Expected headings
"Origin"
"Insertion"
"Action"
"Etymology"