).sfused brain hemispheres, cerebral fissure, optic nerve bundle, left eye pupil, retinal vessels, macula lutea, choroid layer, sclera, corneal epithelium, pupil reflex arc, iris sphincter muscle, conjunctiva, nasopharynx, adenoids, eustachian tube, carotid arteries, cavernous sinus, internal carotid bulb, vertebral bodies (C1-C7), discus fibrosus, spinal cord, lumbar vertebrae (L2-L5), sciatic nerve bundle, semicircular canals, vestibular apparatus, endolymphatic sac, malleus and incus bones