inferior rectus muscle n.
A muscle with origin from the inferior part of the tendinous ring, with insertion into the sclera of the eye, with nerve supply from the oculomotor nerve, and whose action directs the pupil downward and medialward.
- Inferior sagittal sinus
inferior sagittal sinus n. An unpaired dural sinus in the lower margin of the falx cerebri.
- Inferior salivary nucleus
inferior salivary nucleus n. A group of preganglionic parasympathetic motor neurons located in the medulla oblongata dorsal to the ambiguous nucleus; its axons govern secretion from the parotid gland by way of the otic ganglion.
- Inferior tarsal muscle
inferior tarsal muscle n. A poorly developed smooth muscle in the lower eyelid that acts to widen the palpebral fissure.
- Inferior temporal line
inferior temporal line n. The lower of two curved lines on the parietal bone, marking the limit of attachment of the temporal muscle.