Home
Flashcards
Preview
Pineal Gland S3M1
Home
Get App
Take Quiz
Create
When does the pineal gland begin development
10th week
Dorsal diverticulum (epiphysis)
An out-pocketing of the Diencephalon that initiates the formation of the Pineal gland
The Pineal recess communicates with
The third ventricle
What are the two cell types of the pineal gland derived from
Primordial neuroepithelial cells
What are the two types of cells in the Pineal gland
Pinealocytes
Glial like interstitial cells
Connective tissue septa in the pineal gland is formed by
The envelopment of the Pineal gland by the meninges
What type of organ is the Pineal gland
Neuroendocrine organ
Pinealocytes
These are organized in cords and clusters in the Pineal gland and secrete primarily melatonin
Melatonin is synthesized by
The conversion of Tryptophan into Serotonin and then to Melatonin
Melatonin is highest and lowest when
Highest at night, lowest in the day
Corpora arenacea
"Brain sand" Calcified
extracellular
concretions made of CaPO4 and CaCO3
Corpora arenacea appear when, and have what clinical feature
They appear in early childhood and increase in size with age
They are a good landmark in brain x-rays and scans
Pinealocytes have what that lies near capillaries
One or two long cytoplasmic processes terminating near capillaries
The cytoplasm of the Pinealocytes are abundant with
Mitochondria
Exposure to light causes a rapid decrease in what substance in the pineal gland, with what effect
Rapid decrease in N-acetyltransferase which lowers the melatonin synthesis (Only found in the pineal gland)
5-Hydroxyindole-O-methyltransferase
Only found in the Pineal gland
Converts serotonin to melatonin when light is contacting the eyes
Melatonin may stimulate the release of Growth hormone by
Inhibiting Somatostatin release
What kind of nerve fibers synapse on pinealocytes
Sympathetic Post ganglionic axons that lose the myelin sheath upon entering the Pineal gland
They release Norepinephrine
Seasonal Affected Disorder (SAD)
This is a type of depression that affects some people in the winter that is corrected when exposed to bright light
Precocious puberty can be caused by
A tumor in the Pineal gand
Author
lancesadams
ID
89966
Card Set
Pineal Gland S3M1
Description
Micro Anatomy
Updated
8/13/2011, 3:08:50 AM
Show Answers
Home
Flashcards
Preview