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The pineal gland is present in almost all vertebrates, but is absent in protochordates in which there is a simple pineal homologue. The hagfish , archaic vertebrates, lack a pineal gland. [ 7 ] In some species of amphibians and reptiles, the gland is linked to a light-sensing organ, variously called the parietal eye , the pineal eye or the ...
Calcification can manifest itself in many ways in the body depending on the location. In the pulpal structure of a tooth, calcification often presents asymptomatically, and is diagnosed as an incidental finding during radiographic interpretation. Individual teeth with calcified pulp will typically respond negatively to vitality testing; te
An abundance of cilia and centrioles has also been found in these Type 2 cells of the pineal gland. [7] Unique to the Type 2 is the presence of vacuoles containing 2 layers of membrane. [7] As Type 1 cells contain serotonin, Type 2 cells contain melatonin and are thought to have similar characteristics as endocrine and neuronal cells. [8]
The pineal gland thereby was established as an endocrine gland. As it controls other the important endocrine glands, including the so-called "master gland", the pituitary gland, it is more appropriate to refer the pineal gland as the true "master gland" of the body. [5] [6] [7]
Corpora arenacea (singular: corpus arenaceum, [1] also called brain sand or acervuli [2] [3] or psammoma bodies [4] or pineal concretions [4]) are calcified structures in the pineal gland and other areas of the brain such as the choroid plexus. Older organisms have numerous corpora arenacea, whose function, if any, is unknown.
Hydroxyapatite crystals are also found in pathological calcifications such as those found in breast tumors, [8] as well as calcifications within the pineal gland (and other structures of the brain) known as corpora arenacea or "brain sand". [9]
A pineal gland cyst is a usually benign (non-malignant) cyst in the pineal gland, a small endocrine gland in the brain. Historically, these fluid-filled bodies appeared on 1-4% of magnetic resonance imaging (MRI) brain scans, but were more frequently diagnosed at death, seen in 4-11% of autopsies. [1]
Pineal gland: brain: melatonin: 32 Prostate: surrounds the urethra just below the urinary bladder: tubulo-alveolar 33 Pyloric glands: antrum of the pylorus, stomach: mucous, gastrin: simple branched tubular 34 Sebaceous gland: skin: sebum acinar - branched 35 Skene's gland, lesser vestibular gland, paraurethral gland