Author: Glossary

Conjoined twins in which the smaller fetus is attached to the orbit of the larger fetus.  

Concerning the orbit and nasal cavity of the skull.  

An anthropometric landmark, being the lowest point along the inferior margin of the orbit. It is one of two landmarks (the other is the porion) used to establish the Frankfort horizontal plane, most frequently in positioning the head for radiographs or measurements.  

The circular muscle surrounding the mouth. It is a muscle of facial expression, innervated by the facial nerve.  

The portion of the ciliary body consisting of a bandlike zone lying directly anterior to the ora serrata.  

Muscle surrounding an orifice; a sphincter muscle.  

The oral stage of psychosexual development, which involves sucking or chewing on objects other than food.  

The instruction of hearing-impaired students with speech or speech reading rather than with signed or finger-spelled words.