The thick Connective Tissue covering the Brain and Spinal Cord.
Menarche
The period when the first Menstrual Period occurs.
Memory Cell
A Lymphocyte that tracks the various Microorganisms encountered by the Body.
Membranous Urethra
Part of the Male Urethra that passes through the Connective Tissue in the Perineum.
Membrane Protein
Protein in the Cell Wall that goes completely through the wall or is integrated into the wall with part of the Protein Molecules projecting into or out of the Cell.
Melatonin
Hormone Secreted by the Pineal Gland.
Melanosome
Small Vesicle containing Melanin Pigment. Melanosomes are found in Melanocytes.
Melanocyte-Stimulating Hormone (MSH)
Secreted by the Intermediate Lobe of the Piruitary Gland that has an effect on Melanocytes in skin.