Pineal Gland Essentials. 1  Of the endocrine organs, the function of the pineal gland was the last discovered. 2  Located deep in the center of the brain, the pineal gland was once known as the âthird eye.â. 3  The pineal gland produces melatonin, which helps maintain circadian rhythm and regulate reproductive hormones.
View Full Document. 59) Which of the following anatomical terms refers to the ear? a) otic b) orbital c) ocular d) oral e) occipital Answer: a Difficulty: Hard Learning Objective 1: LO 1.5 Describe the anatomical position and how anatomical terms are used to describe the human body.
ear-stone (otolith) A generally oval-shaped, solid, calcareous structure that is enclosed in membranaceous sacs in the inner-ear region of the brain of vertebrates. Although there are usually three ear-stones on each side of the brain, the middle one, the sagitta, is often the largest. Because the ear-stone shows growth zones, or annual rings, it is used by fish biologists to determine the age of fish.